The ultrafast carrier relaxation processes in CdTe quantum dots are investigated by femtosecond fluorescence upconversion spectroscopy.Photo-excited hole relaxing to the edge of the forbidden gap takes a maximal time ...The ultrafast carrier relaxation processes in CdTe quantum dots are investigated by femtosecond fluorescence upconversion spectroscopy.Photo-excited hole relaxing to the edge of the forbidden gap takes a maximal time of ～ 1.6 ps with exciting at 400 nm,depending on the state of the photo-excited hole.The shallow trapped states and deep trap states in the forbidden gap are confirmed for CdTe quantum dots.In addition,Auger relaxation of trapped carriers is observed to occur with a time constant of ～ 5 ps.A schematic model of photodynamics is established based on the results of the spectroscopy studies.Our work demonstrates that femtosecond fluorescence up-conversion spectroscopy is a suitable and effective tool in studying the transportation and conversion dynamics of photon energy in a nanosystem.展开更多
This paper reports that hexagonal-phase LaF3：Yb0.20^3＋,Er0.02^3＋ and LaF3：Yb0.20^3＋, Tm0.02^3＋ nanocrystals （NCs） were synthesized via a hydrothermal method. The transmission electron microscopy, selected are...This paper reports that hexagonal-phase LaF3：Yb0.20^3＋,Er0.02^3＋ and LaF3：Yb0.20^3＋, Tm0.02^3＋ nanocrystals （NCs） were synthesized via a hydrothermal method. The transmission electron microscopy, selected area electron diffraction, powder x-ray diffraction, and thermogravimetric analysis are used to characterize the NCs. Under 980 nm excitation, the Yb^3＋/Er^3＋ and Yb^3＋/Tm^3＋ codoped NCs colloidal solutions present bright green and blue upconversion fluorescence, respectively. These NCs show efficient infrared-to-violet and infrared-to-visible upconversion. The upconversion fluo- rescence mechanisms of LaF2：Yb0.20^3＋, Er0.02^3＋ and LaF3：Yb0.20^3＋,Tm0.02^3＋ NCs are investigated with a 980-nm diode laser as excitation source.展开更多
Super-fine electrohydrodynamic inkjet(SIJ)printing of perovskite nanocrystal(PNC)colloid ink exhibits significant potential in the fabrication of high-resolution color conversion microstructures arrays for fullcolor m...Super-fine electrohydrodynamic inkjet(SIJ)printing of perovskite nanocrystal(PNC)colloid ink exhibits significant potential in the fabrication of high-resolution color conversion microstructures arrays for fullcolor micro-LED displays.However,the impact of solvent on both the printing process and the morphology of SIJ-printed PNC color conversion microstructures remains underexplored.In this study,we prepared samples of CsPbBr3PNC colloid inks in various solvents and investigated the solvent's impact on SIJ printed PNC microstructures.Our findings reveal that the boiling point of the solvent is crucial to the SIJ printing process of PNC colloid inks.Only does the boiling point of the solvent fall in the optimal range,the regular positioned,micron-scaled,conical PNC microstructures can be successfully printed.Below this optimal range,the ink is unable to be ejected from the nozzle;while above this range,irregular positioned microstructures with nanoscale height and coffee-ring-like morphology are produced.Based on these observations,high-resolution color conversion PNC microstructures were effectively prepared using SIJ printing of PNC colloid ink dispersed in dimethylbenzene solvent.展开更多
The design of the photocatalytic materials has made a great of remarkable progress in the area of the enhancement photocatalytic activity,but there are still lots of problems such as wide band gap,low utilization of s...The design of the photocatalytic materials has made a great of remarkable progress in the area of the enhancement photocatalytic activity,but there are still lots of problems such as wide band gap,low utilization of sunlight,low quantum efficiency and poor stability,which further limit the extensive practical applications.Thus,it is a hot research topic and key scientific problem to be solved that how to design and prepare the catalysts,which can respond to visible and near-infrared light in sunlight.Inspired by efficient nonlinear optical upconversion materials,upconversion-based nanocomposites can indirectly broaden the absorption ranges of semiconductors by co nverting the captured long-band visible and near-infrared incident light into high-energy short-band visible or ultraviolet light,which can be adopted as the promising candidate in wide-spectral-light-activating photocatalytic materials coupling with conventional semiconductors.According to our recent works and literature reports,recent review summarizes the research progress of photocatalytic materials with upconversion effect on photolysis of water for hydrogen production,degradation of organic and inorganic pollutants,reduction of CO_(2) and photodynamic therapy.The prepared nanocomposites can suppress the recombination of electrons and holes,and greatly improve the photocatalytic efficiency by the synergistic effect.It maybe stimulates a great interest in rational design and preparation of efficient full-spectrum photocatalytic systems and their wide application in solar energy conversion.展开更多
Carbon materials are a key component in energy storage and conversion devices and their microstructure plays a crucial role in determining device performance.However,traditional carbon materials are unable to meet the...Carbon materials are a key component in energy storage and conversion devices and their microstructure plays a crucial role in determining device performance.However,traditional carbon materials are unable to meet the requirements for applications in emerging fields such as renewable energy and electric vehicles due to limitations including a disordered structure and uncontrolled defects.With an aim of realizing devisable structures,adjustable functions,and performance breakthroughs,superstructured carbons is proposed and represent a category of carbon-based materials,characterized by precisely-built pores,networks,and interfaces.Superstructured carbons can overcome the limitations of traditional carbon materials and improve the performance of energy storage and conversion devices.We review the structure-activity relationships of superstructured carbons and recent research advances from three aspects including a precisely customized pore structure,a dense carbon network framework,and a multi-component highly coupled interface between the different components.Finally,we provide an outlook on the future development of and practical challenges in energy storage and conversion devices.展开更多
Fluorescence imaging techniques represent essential tools in in vitro,preclinical,and clinical studies.In this study,an improved one-step hydrothermal method to synthesize citric acid(CA)modifiedα-NaYbF_(4):2%Er^(3+)...Fluorescence imaging techniques represent essential tools in in vitro,preclinical,and clinical studies.In this study,an improved one-step hydrothermal method to synthesize citric acid(CA)modifiedα-NaYbF_(4):2%Er^(3+)nanocrystals was proposed.The introduction of various doping ions into NaYbF_(4):2%Er^(3+)and the different valence states of the same ions affect both the crystal size and upconversion luminesce nce.There fore,we investigated the upconversion luminesce nce enha ncement of NaYbF_(4):2%Er^(3+)by ion doping and find that the upconversion luminescence intensity of the upconversion nanoparticles(UCNPs)co-doped with 5 mol%Fe^(2+)ions shows the greatest enhancement,especially for red emission at654 nm.Furthermore,HeLa cells incubated with UCNPs allow for imaging with strong red upconversion emission detectio n.Confocal laser scanning microscope(CLSM)fluorescent images of HeLa cells indicate that NaYbF_(4):2%Er/5%Fe^(2+)leads to a clear outline and improves visualization of the cell morphology.In addition,the CA coated NaYbF_(4):2%Er^(3+)/5%Fe^(2+)nanoparticles and NaYbF_(4):2%Er^(3+)/5%Fe^(2+)show low cytotoxicity in HeLa cells.Organ imaging reveals the efficiency of these UCNPs to analyze the lungs,liver,and spleen.Together,these results indicate that the Cit-NaYbF_(4):2%Er^(3+)/5%Fe^(2+)UCNPs are efficient nanoprobes for fluorescence molecular to mography.展开更多
Accurate prediction of the composition of pyrolysis products is the prerequisite for achieving directional regulation of organic-rich shale pyrolysis and conversion products.In this paper,the classical segmented pyrol...Accurate prediction of the composition of pyrolysis products is the prerequisite for achieving directional regulation of organic-rich shale pyrolysis and conversion products.In this paper,the classical segmented pyrolysis kinetics model and a new refined pyrolysis kinetics model were used to forecast the composition distribution of hydrocarbon generation products co-heated by supercritical water and medium and low maturity organic-rich shale.The prediction accuracy of the two reaction kinetics models for the composition of pyrolysis products of organic-rich shale was compared.The reaction path of hydrocarbon generation in centimeter sized organic-rich shale under the action of supercritical water was identified.The results show that the prediction accuracy of the classical segmented pyrolysis kinetics model was poor at the initial stage of the reaction,and gradually increased with increasing time.The prediction error can reach less than 25%when the reaction time was 12 h.The new refined model of reaction kinetics established is better than the classical reaction kinetics model in predicting the product distribution of pyrolysis oil and gas,and its prediction error is less than 14%in this paper.The reaction paths of hydrocarbon generation in centimeter sized organic-rich shale under supercritical water conversion mainly include organic-rich shale directly generates asphaltene and saturated hydrocarbon,asphaltene pyrolysis generates saturated hydrocarbon,aromatic hydrocarbon and resin,saturated hydrocarbon,aromatic hydrocarbon and resin polymerization generates asphaltene,and saturated hydrocarbon,resin and asphaltene generates gas.The reason for the difference of centimeter sized and millimeter sized medium and low maturity organic-rich shales hydrocarbon generation in supercritical water is that the increase of shale size promotes the reaction path of polymerization of saturated hydrocarbon and aromatic hydrocarbon to asphaltene.展开更多
Zinc phthalocyanines(ZnPc)are widely recognized as efficient triplet photosensitizers in photodynamic therapy and photocatalysis,owing to their intense absorption in the visible range and long triplet-state lifetimes....Zinc phthalocyanines(ZnPc)are widely recognized as efficient triplet photosensitizers in photodynamic therapy and photocatalysis,owing to their intense absorption in the visible range and long triplet-state lifetimes.However,their application in triplet-triplet annihilation(TTA)upconversion is lacking to date.In this study,we synthesized a new ZnPc photosensitizer,4I-ZnPc,and composed a TTA upconversion system using rubrene as the energy acceptor.Upon photoexcitation at 663 nm,yellow fluorescence from rubrene was observed in deoxygenated dichloromethane,demonstrating TTA upconversion with an anti-Stokes shift of 0.331 eV and a quantum yield of 1.82%(out of the 50%maximum).Using nanosecond transient absorption spectroscopy,we determined the triplet lifetime of 4I-ZnPc,the triplet-triplet energy transfer efficiency,and the fluorescence quantum yield.These measurements provide critical insights into the photophysical processes governing the TTA upconversion system.Our results highlight the potential advantages and limitations of ZnPc as a triplet photosensitizer for TTA upconversion.展开更多
Herbicides are the most widely used class of pesticides in modern agriculture,while they are still problematic for their off-target hazards due to volatility,drift,and leaching.Nanoformulations appear to be a promisin...Herbicides are the most widely used class of pesticides in modern agriculture,while they are still problematic for their off-target hazards due to volatility,drift,and leaching.Nanoformulations appear to be a promising alternative to those traditional counterparts as herbicidal delivery systems in presenting equivalent control efficacy and higher biosafety profile,but there is no approach yet to dynamically track the release of herbicidal active ingredients in weeds.To bridge the gap between the visualization of herbicidal efficacy with nanoformulation and the mechanistic understanding of the active ingredient release in vivo,we present a proof-of-concept study on the development of a green nanoformulation of herbicide(nanoherbicide)delivering 2-methyl-4-chlorophenoxyacetic acid(MCPA)based on the co-assembly of MCPA and cationic carbon dot.The release of MCPA can be tracked in vivo via a fluorescence lighting-up strategy,due to the disassembly of the nanoherbicide in weeds and the liberation of carbon dot.Compared to active ingredient,the nanoherbicide exhibits reduced volatilization rate,improved foliar affinity,and retarded leaching effect in the soil,and the hazards on off-target organisms including farming plant,soil enzymes and microbiota are appreciably minimized.Due to the characteristics of carbon dot's fluorescence quenching and lightening as the nanoherbicide forms and disassembles,respectively,the entry,translocation,and disassembly of the nanoherbicide in weeds are recorded with fluorescent microscopy.Additionally,the timing to observe the disassembly state ex vivo and to visualize the early symptoms of weed wilting match,suggesting that the released MCPA retains mechanism of action against weeds.In contrast to other labelled nanoherbicides displaying stable fluorescence,this self-reportable fluorescence lighting-up nanoherbicide provides a viable solution to predict/correlate the herbicidal efficacy with fluorescence more realistically.展开更多
Lithium-sulfur(Li-S)batteries promise high energy density but suffer from low conductivity,polysulfide shuttling,and sluggish conversion kinetics.The construction of heterointerfaces is an effective strategy for enhan...Lithium-sulfur(Li-S)batteries promise high energy density but suffer from low conductivity,polysulfide shuttling,and sluggish conversion kinetics.The construction of heterointerfaces is an effective strategy for enhancing both polysulfide adsorption and conversion;however,the poor lattice compatibility in the heterointerface formed by different materials hinders interfacial charge transfer.In response to these challenges,herein,a biphasic homojunction of TiO_(2)enriched with oxygen vacancies and decorated with nitrogen-doped carbon nanotubes(B-TiO_(2-x)@NCNT)was designed to simultaneously enhance adsorption ability and catalytic activity.This homojunction interface composed of rutile(110)and anatase(101)plane exhibits excellent compatibility,and density functional theory(DFT)calculations reveal that this biphasic interface possesses a much higher binding energy to polysulfides compared to single-phase TiO_(2).Additionally,NCNTs are in situ grown on both interior and exterior surfaces of the hollow TiO_(2)nanospheres,facilitating rapid electron transfer for the encapsulated sulfur.The homojunction interface synergistically leverages the oxygen vacancies and highly conductive NCNTs to enhance the bidirectional catalytic activity for polysulfide conversion.Therefore,in this multifunctional sulfur-host,polysulfides are first strongly adsorbed at the homojunction interfaces and subsequently undergo smooth conversion,nucleation,and decomposition,completing a rapid sulfur redox cycle.The assembled Li-S battery delivered a high specific capacity of 1234.3 mAh g^(-1)at 0.2 C,long cycling stability for over 1000 cycles at 5 C with a low decay rate of 0.035%,and exciting areal capacity at a high sulfur loading of 5.6 mg cm^(-2)for 200cycles.展开更多
To develop new up-conversion luminescent materials for non-contact optical thermometer with high sensitivity and temperature re solution,a battery of KBaGd(MoO_(4))_(3):Yb^(3+),Ho^(3+)phosphors were fabricated through...To develop new up-conversion luminescent materials for non-contact optical thermometer with high sensitivity and temperature re solution,a battery of KBaGd(MoO_(4))_(3):Yb^(3+),Ho^(3+)phosphors were fabricated through solid reaction process.The crystal structure,up-conversion luminescence,energy transfer,thermal stability and optical temperature sensing performances were studied in detail.Under 980 nm laser excitation,the KBaGd(MoO_(4))_(3):Yb^(3+),Ho^(3+)phosphor exhibits distinctive emission bands of Ho^(3+)at545,660,and 755 nm,and excellent illuminant performance.Based on the thermally coupled levels(TCLs)of Ho^(3+),both the relative sensitivity(S_(r))and absolute sensitivity(S_(a))display similar change trends,with the highest values of 6.73%/K(@298 K)and 5.69%/K(@298 K),respectively.Furthermore,the highest Saof 13.90%/K(@623 K)and the ultimate Srof 0.62%/K(@298 K)are achieved based on non-TCLs of Ho^(3+).Therefore,KBaGd(MoO_(4))_(3):Yb^(3+),Ho^(3+)phosphor is a promising candidate for self-referenced optical thermometry.展开更多
Based on the rapid advancements in nanomaterials and nanotechnology,the Nanofluidic Reverse Electrodialysis(NRED)has attracted significant attention as an innovative and promising energy conversion strategy for extrac...Based on the rapid advancements in nanomaterials and nanotechnology,the Nanofluidic Reverse Electrodialysis(NRED)has attracted significant attention as an innovative and promising energy conversion strategy for extracting sustainable and clean energy fromthe salinity gradient energy.However,the scarcity of research investigating the intricate multi-factor coupling effects on the energy conversion performance,especially the trade-offs between ion selectivity and mass transfer in nanochannels,of NRED poses a great challenge to achieving breakthroughs in energy conversion processes.This numerical study innovatively investigates the multi-factor coupling effect of three critical operational factors,including the nanochannel configuration,the temperature field,and the concentration difference,on the energy conversion processes of NRED.In this work,a dimensionless amplitude parameter s is introduced to emulate the randomly varied wall configuration of nanochannels that inherently occur in practical applications,thereby enhancing the realism and applicability of our analysis.Numerical results reveal that the application of a temperature gradient,which is oriented in opposition to the concentration gradient,enhances the ion transportation and selectivity simultaneously,leading to an enhancement in both output power and energy conversion efficiency.Additionally,the increased fluctuation of the nanochannel wall from s=0 to s=0.08 improves ion selectivity yet raises ion transport resistance,resulting in an enhancement in output power and energy conversion efficiency but a slight reduction in current.Furthermore,with increasing the concentration ratio cH/cL from 10 to 1000,either within a fixed temperature field or at a constant dimensionless amplitude,the maximumpower consistently attains its optimal value at a concentration ratio of 100 but the cation transfer number experiences amonotonic decrease across this entire range of concentration ratios.Finally,uponmodifying the operational parameters fromthe baseline condition of s=0,c_(H)/c_(L)=10,andΔT=0 K to the targetedconditionof s=0.08,c_(H)/c_(L)=50,andΔT=25 K,there is a concerted improvement observed in the open-circuit potential,short-circuit current,andmaximumpower,with respective increments of 8.86%,204.97%,and 232.01%,but a reduction in cation transfer number with a notable decrease of 15.37%.展开更多
This paper reports the 450 nm up-conversion Buorescence of the crystalline TmP_(5)O_(14) at room temperature induced by pulsed DCM dye laser.It is iound that the up-conversion mechanism is the excited st&te absorp...This paper reports the 450 nm up-conversion Buorescence of the crystalline TmP_(5)O_(14) at room temperature induced by pulsed DCM dye laser.It is iound that the up-conversion mechanism is the excited st&te absorption.展开更多
BACKGROUND The treatment of gastric cancer remains highly challenging,particularly in cases of unresectable locally advanced or metastatic disease.Although chemotherapy and immunotherapy have shown some efficacy in su...BACKGROUND The treatment of gastric cancer remains highly challenging,particularly in cases of unresectable locally advanced or metastatic disease.Although chemotherapy and immunotherapy have shown some efficacy in such patients,significant limitations persist in extending survival and enhancing safety.To address these challenges,we designed an innovative first-line quadruple conversion therapy regimen that integrates a programmed cell death protein 1(PD-1)inhibitor with chemotherapy,and we successfully implemented this therapy regimen in the treatment of a patient with unresectable locally advanced gastric adenocarcinoma.CASE SUMMARY We report the case of a 55-year-old male who was diagnosed with unresectable locally advanced gastric adenocarcinoma and presented with intermittent epigastric pain and multiple lymph node metastases in the abdominal cavity,with the metastasis being notably large in size.The tumor tissue was negative for human epidermal growth factor receptor 2 by immunohistochemistry.Considering the patient's status,the multidisciplinary team decided to administer sintilimab in combination with albumin-bound paclitaxel(nab-paclitaxel),S-1,and oxaliplatin as a quadruple drug conversion therapy.After 4 cycles of conversion therapy,the patient's epigastric pain was significantly alleviated,his stool color normalized,the volume of the primary tumor and lymph node metastases was markedly reduced,and the tumor marker levels decreased to within the normal range.The patient subsequently underwent laparoscopic total gastrectomy with abdominal lymph node dissection,and postoperative pathological biopsy revealed a pathological complete response and R0 resection,after which the patient recovered to an excellent physical status.CONCLUSION To the best of our knowledge,this is the first reported case of unresectable locally advanced gastric adenocar-cinoma successfully treated with quadruple therapy with a PD-1 inhibitor and chemotherapy as a first-line conversion regimen.This first-line conversion therapy with the quadruple regimen may be effective and safe for unresectable locally advanced gastric adenocarcinoma.展开更多
Rosmarinic acid(RA)is promising as a natural and nontoxic food additive.However,many analysis methods for RA generally depend on large instruments and single signals for quantitative detection.A new upconversion fluor...Rosmarinic acid(RA)is promising as a natural and nontoxic food additive.However,many analysis methods for RA generally depend on large instruments and single signals for quantitative detection.A new upconversion fluorescence,colorimetric and photothermal multi-modal sensing strategy is developed for the quantification of RA.β-cyclodextrin(CD)modified citric acid(Cit)wrapped NaYF_(4):Yb/Er-Cit-CD(Y:Yb/Er-Cit-CD)up-conversion nanocomposite has been synthesized,which emits green fluorescence at 550nm under 980nm near-infrared(NIR)excitation.In the presence of oxidized 3,3',5,5'-tetramethylbenzidine(oxTMB),the green fluorescence is significantly quenched attributed to the fluorescence inner filter effect(IFE)between oxTMB and Y:Yb/Er-Cit-CD.When RA is intervened,blue oxTMB is reduced to colorless 3,3',5,5'-tetramethylbenzidine(TMB)inducing the recovery of up-conversion fluorescence.At the same time,colorimetric and photothermal signals readout can be easily achieved thanks to the color indication and photothermal effect of the oxTMB.The constructed Y:Yb/Er-Cit-CD/oxTMB sensor displays high sensitivity,visibility and simplicity for RA,and the limits of detection(LOD)for fluorescence,colorimetric and photothermal were 0.004μmol/L,0.036μmol/L and 0.043μmol/L,respectively.This sensing system is successfully performed for the detection of RA in food samples.展开更多
This paper reports the preparation of yttrium oxide(Y_(2)O_(3))doped with various concentrations of Er^(3+)using high temperature synthesis method.Photoluminescence(PL)emission spectra of the samples were recorded at ...This paper reports the preparation of yttrium oxide(Y_(2)O_(3))doped with various concentrations of Er^(3+)using high temperature synthesis method.Photoluminescence(PL)emission spectra of the samples were recorded at an excitation of 980 nm laser source.Two prominent peaks centered at 484 nm and 574 nm were found and attributed to the^(2)P3/2→^(4)I_(11/2)and^(4)S_(3/2)→^(4)I_(15/2),respectively.The sample with 2.5 mol%of Er^(3+)provided the optimum intensity in emission spectra.The sample with optimum PL emission was investigated for its thermoluminescence(TL)glow curve exhibited the second order kinetics.The peak TL intensity was found around 236°C,i.e.,towards high temperature which supports the fact of formation of deeper traps.Therefore,the material taken may be regarded as a good candidate for light emitting diode(LED)applications.展开更多
The modification of NaYF4:Yb,Er(Tm) nanoparticles synthesized in the presence of an ionic surfactant is critical to their application in biological fields for better solubility and biocompatibility. In this work, NaYF...The modification of NaYF4:Yb,Er(Tm) nanoparticles synthesized in the presence of an ionic surfactant is critical to their application in biological fields for better solubility and biocompatibility. In this work, NaYF4:Yb,Er(Tm) was transformed from insoluble, inactive to hydrophilic, biocompatible via ligand exchange modification with polyacrylic acid (PAA). Ligand exchange was carried out at room temperature when a colloidal solution of NaYF4:Yb,Er(Tm) in tetrahydrofuran (THF) was treated with excess PAA. The PAA modified NaYF4:Yb,Er(Tm) nanoparticles got better surface properties but with declined inner up-conversion fluorescence. Generally, coating an analogous layer of material outside the core nanoparticles can improve the optical properties of the core. Accordingly, NaYF4:Yb,Er(Tm)/NaYF4 nanoparticles were synthesized before PAA modification to avoid the optical intensity decaying. The result of fluorescence test proved that the water soluble NaYF4:Yb,Er(Tm)/NaYF4/PAA nanocomposites had a sound up-conversion property compared with that of NaYF4:Yb,Er(Tm)/PAA. Furthermore, the up-conversion fluorescence property of the nanocomposite varied with the doping ratio of Er(Tm) to Yb and the possible mechanism for this change was also discussed.展开更多
Efficient conversion and synergistic solar energy utilization are critical for advancing low-carbon and sustainable development.In this study,two Pt(Ⅱ)-based metal/halogen-bonded organic frameworks(MXOFBen and MXOF-A...Efficient conversion and synergistic solar energy utilization are critical for advancing low-carbon and sustainable development.In this study,two Pt(Ⅱ)-based metal/halogen-bonded organic frameworks(MXOFBen and MXOF-Anth)were designed to enhance photoconversion efficiency and enable multifunctional integration.The ligand L-terpyr is formed by coupling tripyridine with diphenylamine dipyridine,in which the tripyridine effectively acts as a metal-ligand to lower the band gap and promote nonradiative leaps,thereby enhancing the photoconversion ability.Meanwhile,diphenylamine dipyridine serves as a[N…I^(+)…N]halogen-bonding acceptor,imparting superhydrophilicity to the materials and increasing carrier density,further improving photocatalytic performance.Experimental results demonstrate that these two MXOFs achieve impressive interfacial water evaporation efficiencies of up to87.8%and 94.0%,respectively.Additionally,the materials exhibit excellent performance in photothermal power generation and photocatalysis of H_(2)O_(2).Notably,the MXOFs also deliver strong overall performance in integrated systems combining interfacial water evaporation with photothermal power generation or photocatalysis,underscoring their exceptional photoconversion efficiency and multifunctional potential.This work introduces a novel strategy by incorporating metal-ligand and halogen bonds,offering a pathway to enhance photoconversion efficiency and develop versatile materials for advanced solar energy applications,thereby fostering the progress of high-efficiency solar energy conversion and multifunctional organic materials.展开更多
yb^3＋：Er^3＋ co-doped oxy-fluoride ceramics glass has been prepared. The mechanism of up-conversion emissions about Er^3＋ was discussed, and the temperature properties of green up-conversion fluorescence between 30...yb^3＋：Er^3＋ co-doped oxy-fluoride ceramics glass has been prepared. The mechanism of up-conversion emissions about Er^3＋ was discussed, and the temperature properties of green up-conversion fluorescence between 303 and 823 K were investigated. The results show that the sensitivity of this sample reaches its maximum value, about 0.0047 K^-1, when the temperature is 383 K, indicating that this kind of sample can be used as high temperature and high sensitivity optical temperature sensor.展开更多
Over the past ten years,numerous papers have been published on the use of indocyanine green(ICG)fluorescence in liver surgery for hepatocellular carcinoma(HCC).There are many different applications.The first involves ...Over the past ten years,numerous papers have been published on the use of indocyanine green(ICG)fluorescence in liver surgery for hepatocellular carcinoma(HCC).There are many different applications.The first involves targeting superficial tumors in patients with macronodular cirrhosis and an irregular liver surface.In a minimally invasive setting,the lack of tactile feedback on the hepatic surface makes detecting subcapsular HCC with ultrasound alone challenging.ICG fusion images can mimic the tactile feedback of the hand and act as an ultrasound booster.ICG fluorescence can be used to evaluate tumor residues after minimally invasive thermal ablation.ICG fluorescence imaging can also be used to identify the grade of HCC early on and evaluate the microinvasive component.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 11074003 and 20973001)the Key Program of Educational Commission of Anhui Province of China (Grant No. KJ2010A132)
文摘The ultrafast carrier relaxation processes in CdTe quantum dots are investigated by femtosecond fluorescence upconversion spectroscopy.Photo-excited hole relaxing to the edge of the forbidden gap takes a maximal time of ～ 1.6 ps with exciting at 400 nm,depending on the state of the photo-excited hole.The shallow trapped states and deep trap states in the forbidden gap are confirmed for CdTe quantum dots.In addition,Auger relaxation of trapped carriers is observed to occur with a time constant of ～ 5 ps.A schematic model of photodynamics is established based on the results of the spectroscopy studies.Our work demonstrates that femtosecond fluorescence up-conversion spectroscopy is a suitable and effective tool in studying the transportation and conversion dynamics of photon energy in a nanosystem.
基金supported by the National Natural Science Foundation of China (Grant Nos 10474096 and 50672030)
文摘This paper reports that hexagonal-phase LaF3：Yb0.20^3＋,Er0.02^3＋ and LaF3：Yb0.20^3＋, Tm0.02^3＋ nanocrystals （NCs） were synthesized via a hydrothermal method. The transmission electron microscopy, selected area electron diffraction, powder x-ray diffraction, and thermogravimetric analysis are used to characterize the NCs. Under 980 nm excitation, the Yb^3＋/Er^3＋ and Yb^3＋/Tm^3＋ codoped NCs colloidal solutions present bright green and blue upconversion fluorescence, respectively. These NCs show efficient infrared-to-violet and infrared-to-visible upconversion. The upconversion fluo- rescence mechanisms of LaF2：Yb0.20^3＋, Er0.02^3＋ and LaF3：Yb0.20^3＋,Tm0.02^3＋ NCs are investigated with a 980-nm diode laser as excitation source.
基金supported by the National Natural Science Foundation of China(No.62374142)Fundamental Research Funds for the Central Universities(Nos.20720220085 and 20720240064)+2 种基金External Cooperation Program of Fujian(No.2022I0004)Major Science and Technology Project of Xiamen in China(No.3502Z20191015)Xiamen Natural Science Foundation Youth Project(No.3502Z202471002)。
文摘Super-fine electrohydrodynamic inkjet(SIJ)printing of perovskite nanocrystal(PNC)colloid ink exhibits significant potential in the fabrication of high-resolution color conversion microstructures arrays for fullcolor micro-LED displays.However,the impact of solvent on both the printing process and the morphology of SIJ-printed PNC color conversion microstructures remains underexplored.In this study,we prepared samples of CsPbBr3PNC colloid inks in various solvents and investigated the solvent's impact on SIJ printed PNC microstructures.Our findings reveal that the boiling point of the solvent is crucial to the SIJ printing process of PNC colloid inks.Only does the boiling point of the solvent fall in the optimal range,the regular positioned,micron-scaled,conical PNC microstructures can be successfully printed.Below this optimal range,the ink is unable to be ejected from the nozzle;while above this range,irregular positioned microstructures with nanoscale height and coffee-ring-like morphology are produced.Based on these observations,high-resolution color conversion PNC microstructures were effectively prepared using SIJ printing of PNC colloid ink dispersed in dimethylbenzene solvent.
基金Project supported by the National Natural Science Foundation of China(21962006,21707055,21872030)Youth Key Project of Jiangxi Province Natural Science Foundation(20192ACBL21011)+6 种基金Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology(3401223429)Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme(2019)Guangdong Basic and Applied Basic Research Foundation(2019A1515011249)Key Research Project of Natural Science of Guangdong Provincial Department of Education(2019)Jiangxi Province Natural Science Foundation(20181BAB213010)Open Fund of Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control(2018B030322017)Open Fund for Key Laboratory of Green Energy and Environmental Catalysis in Universities of Fujian Province(FJ-GEEC201901)。
文摘The design of the photocatalytic materials has made a great of remarkable progress in the area of the enhancement photocatalytic activity,but there are still lots of problems such as wide band gap,low utilization of sunlight,low quantum efficiency and poor stability,which further limit the extensive practical applications.Thus,it is a hot research topic and key scientific problem to be solved that how to design and prepare the catalysts,which can respond to visible and near-infrared light in sunlight.Inspired by efficient nonlinear optical upconversion materials,upconversion-based nanocomposites can indirectly broaden the absorption ranges of semiconductors by co nverting the captured long-band visible and near-infrared incident light into high-energy short-band visible or ultraviolet light,which can be adopted as the promising candidate in wide-spectral-light-activating photocatalytic materials coupling with conventional semiconductors.According to our recent works and literature reports,recent review summarizes the research progress of photocatalytic materials with upconversion effect on photolysis of water for hydrogen production,degradation of organic and inorganic pollutants,reduction of CO_(2) and photodynamic therapy.The prepared nanocomposites can suppress the recombination of electrons and holes,and greatly improve the photocatalytic efficiency by the synergistic effect.It maybe stimulates a great interest in rational design and preparation of efficient full-spectrum photocatalytic systems and their wide application in solar energy conversion.
文摘Carbon materials are a key component in energy storage and conversion devices and their microstructure plays a crucial role in determining device performance.However,traditional carbon materials are unable to meet the requirements for applications in emerging fields such as renewable energy and electric vehicles due to limitations including a disordered structure and uncontrolled defects.With an aim of realizing devisable structures,adjustable functions,and performance breakthroughs,superstructured carbons is proposed and represent a category of carbon-based materials,characterized by precisely-built pores,networks,and interfaces.Superstructured carbons can overcome the limitations of traditional carbon materials and improve the performance of energy storage and conversion devices.We review the structure-activity relationships of superstructured carbons and recent research advances from three aspects including a precisely customized pore structure,a dense carbon network framework,and a multi-component highly coupled interface between the different components.Finally,we provide an outlook on the future development of and practical challenges in energy storage and conversion devices.
基金Project supported by the Natural Science Basic Research Program of Shaanxi Province(2021JZ-43)the Key Program for International Science and Technology Cooperation Projects of Shaanxi Province(2018KWZ-08)+2 种基金the National Key Research and Development Program of China(2019YFC1520904)the Scientific Research Plan of Shannxi Provincial Education Department,China(18JK0780)Ningxia Natural Fund(2023AAC03338)。
文摘Fluorescence imaging techniques represent essential tools in in vitro,preclinical,and clinical studies.In this study,an improved one-step hydrothermal method to synthesize citric acid(CA)modifiedα-NaYbF_(4):2%Er^(3+)nanocrystals was proposed.The introduction of various doping ions into NaYbF_(4):2%Er^(3+)and the different valence states of the same ions affect both the crystal size and upconversion luminesce nce.There fore,we investigated the upconversion luminesce nce enha ncement of NaYbF_(4):2%Er^(3+)by ion doping and find that the upconversion luminescence intensity of the upconversion nanoparticles(UCNPs)co-doped with 5 mol%Fe^(2+)ions shows the greatest enhancement,especially for red emission at654 nm.Furthermore,HeLa cells incubated with UCNPs allow for imaging with strong red upconversion emission detectio n.Confocal laser scanning microscope(CLSM)fluorescent images of HeLa cells indicate that NaYbF_(4):2%Er/5%Fe^(2+)leads to a clear outline and improves visualization of the cell morphology.In addition,the CA coated NaYbF_(4):2%Er^(3+)/5%Fe^(2+)nanoparticles and NaYbF_(4):2%Er^(3+)/5%Fe^(2+)show low cytotoxicity in HeLa cells.Organ imaging reveals the efficiency of these UCNPs to analyze the lungs,liver,and spleen.Together,these results indicate that the Cit-NaYbF_(4):2%Er^(3+)/5%Fe^(2+)UCNPs are efficient nanoprobes for fluorescence molecular to mography.
基金support by the Basic Science Center Program of the Ordered Energy Conversion of the National Nature Science Foundation of China(NO.52488201)is gratefully acknowledged.
文摘Accurate prediction of the composition of pyrolysis products is the prerequisite for achieving directional regulation of organic-rich shale pyrolysis and conversion products.In this paper,the classical segmented pyrolysis kinetics model and a new refined pyrolysis kinetics model were used to forecast the composition distribution of hydrocarbon generation products co-heated by supercritical water and medium and low maturity organic-rich shale.The prediction accuracy of the two reaction kinetics models for the composition of pyrolysis products of organic-rich shale was compared.The reaction path of hydrocarbon generation in centimeter sized organic-rich shale under the action of supercritical water was identified.The results show that the prediction accuracy of the classical segmented pyrolysis kinetics model was poor at the initial stage of the reaction,and gradually increased with increasing time.The prediction error can reach less than 25%when the reaction time was 12 h.The new refined model of reaction kinetics established is better than the classical reaction kinetics model in predicting the product distribution of pyrolysis oil and gas,and its prediction error is less than 14%in this paper.The reaction paths of hydrocarbon generation in centimeter sized organic-rich shale under supercritical water conversion mainly include organic-rich shale directly generates asphaltene and saturated hydrocarbon,asphaltene pyrolysis generates saturated hydrocarbon,aromatic hydrocarbon and resin,saturated hydrocarbon,aromatic hydrocarbon and resin polymerization generates asphaltene,and saturated hydrocarbon,resin and asphaltene generates gas.The reason for the difference of centimeter sized and millimeter sized medium and low maturity organic-rich shales hydrocarbon generation in supercritical water is that the increase of shale size promotes the reaction path of polymerization of saturated hydrocarbon and aromatic hydrocarbon to asphaltene.
基金supported by the National Natural Science Foundation of China(Nos.22473104 and 22403086)support of the China Postdoctoral Science Foundation(No.2023M733378).
文摘Zinc phthalocyanines(ZnPc)are widely recognized as efficient triplet photosensitizers in photodynamic therapy and photocatalysis,owing to their intense absorption in the visible range and long triplet-state lifetimes.However,their application in triplet-triplet annihilation(TTA)upconversion is lacking to date.In this study,we synthesized a new ZnPc photosensitizer,4I-ZnPc,and composed a TTA upconversion system using rubrene as the energy acceptor.Upon photoexcitation at 663 nm,yellow fluorescence from rubrene was observed in deoxygenated dichloromethane,demonstrating TTA upconversion with an anti-Stokes shift of 0.331 eV and a quantum yield of 1.82%(out of the 50%maximum).Using nanosecond transient absorption spectroscopy,we determined the triplet lifetime of 4I-ZnPc,the triplet-triplet energy transfer efficiency,and the fluorescence quantum yield.These measurements provide critical insights into the photophysical processes governing the TTA upconversion system.Our results highlight the potential advantages and limitations of ZnPc as a triplet photosensitizer for TTA upconversion.
基金the National Natural Science Foundation of China(No.22278414)the National Key Research and Development Program of China(No.2023YFD1702100)+1 种基金the Science and Technology Major Project of Anhui Province(No.202203a06020001)Prof.Jian Luo at Anhui Agricultural University。
文摘Herbicides are the most widely used class of pesticides in modern agriculture,while they are still problematic for their off-target hazards due to volatility,drift,and leaching.Nanoformulations appear to be a promising alternative to those traditional counterparts as herbicidal delivery systems in presenting equivalent control efficacy and higher biosafety profile,but there is no approach yet to dynamically track the release of herbicidal active ingredients in weeds.To bridge the gap between the visualization of herbicidal efficacy with nanoformulation and the mechanistic understanding of the active ingredient release in vivo,we present a proof-of-concept study on the development of a green nanoformulation of herbicide(nanoherbicide)delivering 2-methyl-4-chlorophenoxyacetic acid(MCPA)based on the co-assembly of MCPA and cationic carbon dot.The release of MCPA can be tracked in vivo via a fluorescence lighting-up strategy,due to the disassembly of the nanoherbicide in weeds and the liberation of carbon dot.Compared to active ingredient,the nanoherbicide exhibits reduced volatilization rate,improved foliar affinity,and retarded leaching effect in the soil,and the hazards on off-target organisms including farming plant,soil enzymes and microbiota are appreciably minimized.Due to the characteristics of carbon dot's fluorescence quenching and lightening as the nanoherbicide forms and disassembles,respectively,the entry,translocation,and disassembly of the nanoherbicide in weeds are recorded with fluorescent microscopy.Additionally,the timing to observe the disassembly state ex vivo and to visualize the early symptoms of weed wilting match,suggesting that the released MCPA retains mechanism of action against weeds.In contrast to other labelled nanoherbicides displaying stable fluorescence,this self-reportable fluorescence lighting-up nanoherbicide provides a viable solution to predict/correlate the herbicidal efficacy with fluorescence more realistically.
基金supported by the National Natural Science Foundation of China(Grant No.52372281)the Fundamental Research Funds for the Central Universities(2232020G-07)+3 种基金the foundation of Shanghai Institute of Technology(grant no.YJ2022-37)the Graduate Student Innovation Fund of Donghua University(CUSF-DH-D-2022007)the State Key Laboratory of Advanced Fiber Materials(KF2517)the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning。
文摘Lithium-sulfur(Li-S)batteries promise high energy density but suffer from low conductivity,polysulfide shuttling,and sluggish conversion kinetics.The construction of heterointerfaces is an effective strategy for enhancing both polysulfide adsorption and conversion;however,the poor lattice compatibility in the heterointerface formed by different materials hinders interfacial charge transfer.In response to these challenges,herein,a biphasic homojunction of TiO_(2)enriched with oxygen vacancies and decorated with nitrogen-doped carbon nanotubes(B-TiO_(2-x)@NCNT)was designed to simultaneously enhance adsorption ability and catalytic activity.This homojunction interface composed of rutile(110)and anatase(101)plane exhibits excellent compatibility,and density functional theory(DFT)calculations reveal that this biphasic interface possesses a much higher binding energy to polysulfides compared to single-phase TiO_(2).Additionally,NCNTs are in situ grown on both interior and exterior surfaces of the hollow TiO_(2)nanospheres,facilitating rapid electron transfer for the encapsulated sulfur.The homojunction interface synergistically leverages the oxygen vacancies and highly conductive NCNTs to enhance the bidirectional catalytic activity for polysulfide conversion.Therefore,in this multifunctional sulfur-host,polysulfides are first strongly adsorbed at the homojunction interfaces and subsequently undergo smooth conversion,nucleation,and decomposition,completing a rapid sulfur redox cycle.The assembled Li-S battery delivered a high specific capacity of 1234.3 mAh g^(-1)at 0.2 C,long cycling stability for over 1000 cycles at 5 C with a low decay rate of 0.035%,and exciting areal capacity at a high sulfur loading of 5.6 mg cm^(-2)for 200cycles.
基金supported by the National Natural Science Foundation of China(61865003)。
文摘To develop new up-conversion luminescent materials for non-contact optical thermometer with high sensitivity and temperature re solution,a battery of KBaGd(MoO_(4))_(3):Yb^(3+),Ho^(3+)phosphors were fabricated through solid reaction process.The crystal structure,up-conversion luminescence,energy transfer,thermal stability and optical temperature sensing performances were studied in detail.Under 980 nm laser excitation,the KBaGd(MoO_(4))_(3):Yb^(3+),Ho^(3+)phosphor exhibits distinctive emission bands of Ho^(3+)at545,660,and 755 nm,and excellent illuminant performance.Based on the thermally coupled levels(TCLs)of Ho^(3+),both the relative sensitivity(S_(r))and absolute sensitivity(S_(a))display similar change trends,with the highest values of 6.73%/K(@298 K)and 5.69%/K(@298 K),respectively.Furthermore,the highest Saof 13.90%/K(@623 K)and the ultimate Srof 0.62%/K(@298 K)are achieved based on non-TCLs of Ho^(3+).Therefore,KBaGd(MoO_(4))_(3):Yb^(3+),Ho^(3+)phosphor is a promising candidate for self-referenced optical thermometry.
基金funded by the National Natural Science Foundation of China[52106246]the Postgraduate Research&Practice innovation Program of Jiangsu Province[KYCX24_1641].
文摘Based on the rapid advancements in nanomaterials and nanotechnology,the Nanofluidic Reverse Electrodialysis(NRED)has attracted significant attention as an innovative and promising energy conversion strategy for extracting sustainable and clean energy fromthe salinity gradient energy.However,the scarcity of research investigating the intricate multi-factor coupling effects on the energy conversion performance,especially the trade-offs between ion selectivity and mass transfer in nanochannels,of NRED poses a great challenge to achieving breakthroughs in energy conversion processes.This numerical study innovatively investigates the multi-factor coupling effect of three critical operational factors,including the nanochannel configuration,the temperature field,and the concentration difference,on the energy conversion processes of NRED.In this work,a dimensionless amplitude parameter s is introduced to emulate the randomly varied wall configuration of nanochannels that inherently occur in practical applications,thereby enhancing the realism and applicability of our analysis.Numerical results reveal that the application of a temperature gradient,which is oriented in opposition to the concentration gradient,enhances the ion transportation and selectivity simultaneously,leading to an enhancement in both output power and energy conversion efficiency.Additionally,the increased fluctuation of the nanochannel wall from s=0 to s=0.08 improves ion selectivity yet raises ion transport resistance,resulting in an enhancement in output power and energy conversion efficiency but a slight reduction in current.Furthermore,with increasing the concentration ratio cH/cL from 10 to 1000,either within a fixed temperature field or at a constant dimensionless amplitude,the maximumpower consistently attains its optimal value at a concentration ratio of 100 but the cation transfer number experiences amonotonic decrease across this entire range of concentration ratios.Finally,uponmodifying the operational parameters fromthe baseline condition of s=0,c_(H)/c_(L)=10,andΔT=0 K to the targetedconditionof s=0.08,c_(H)/c_(L)=50,andΔT=25 K,there is a concerted improvement observed in the open-circuit potential,short-circuit current,andmaximumpower,with respective increments of 8.86%,204.97%,and 232.01%,but a reduction in cation transfer number with a notable decrease of 15.37%.
文摘This paper reports the 450 nm up-conversion Buorescence of the crystalline TmP_(5)O_(14) at room temperature induced by pulsed DCM dye laser.It is iound that the up-conversion mechanism is the excited st&te absorption.
基金Supported by the Health Industry Research Program of Gansu Province,No.GSWSKY2021-043the Youth Science and Technology Foundation of Gansu Province,No.22JR11RA002the Natural Science Foundation of Gansu Province,No.22JR5RA008.
文摘BACKGROUND The treatment of gastric cancer remains highly challenging,particularly in cases of unresectable locally advanced or metastatic disease.Although chemotherapy and immunotherapy have shown some efficacy in such patients,significant limitations persist in extending survival and enhancing safety.To address these challenges,we designed an innovative first-line quadruple conversion therapy regimen that integrates a programmed cell death protein 1(PD-1)inhibitor with chemotherapy,and we successfully implemented this therapy regimen in the treatment of a patient with unresectable locally advanced gastric adenocarcinoma.CASE SUMMARY We report the case of a 55-year-old male who was diagnosed with unresectable locally advanced gastric adenocarcinoma and presented with intermittent epigastric pain and multiple lymph node metastases in the abdominal cavity,with the metastasis being notably large in size.The tumor tissue was negative for human epidermal growth factor receptor 2 by immunohistochemistry.Considering the patient's status,the multidisciplinary team decided to administer sintilimab in combination with albumin-bound paclitaxel(nab-paclitaxel),S-1,and oxaliplatin as a quadruple drug conversion therapy.After 4 cycles of conversion therapy,the patient's epigastric pain was significantly alleviated,his stool color normalized,the volume of the primary tumor and lymph node metastases was markedly reduced,and the tumor marker levels decreased to within the normal range.The patient subsequently underwent laparoscopic total gastrectomy with abdominal lymph node dissection,and postoperative pathological biopsy revealed a pathological complete response and R0 resection,after which the patient recovered to an excellent physical status.CONCLUSION To the best of our knowledge,this is the first reported case of unresectable locally advanced gastric adenocar-cinoma successfully treated with quadruple therapy with a PD-1 inhibitor and chemotherapy as a first-line conversion regimen.This first-line conversion therapy with the quadruple regimen may be effective and safe for unresectable locally advanced gastric adenocarcinoma.
基金supported by the National Natural Science Foundation of China(No.21305097)General Project of Education Department in Sichuan(No.035Z2270)+1 种基金Sichuan Key Discipline Construction Project of Traditional Chinese Medicine(No.2021-16-4)Double-Support Plan of Disciplinary Construction in Sichuan Agricultural University-Innovation Team Projects(No.P202108).
文摘Rosmarinic acid(RA)is promising as a natural and nontoxic food additive.However,many analysis methods for RA generally depend on large instruments and single signals for quantitative detection.A new upconversion fluorescence,colorimetric and photothermal multi-modal sensing strategy is developed for the quantification of RA.β-cyclodextrin(CD)modified citric acid(Cit)wrapped NaYF_(4):Yb/Er-Cit-CD(Y:Yb/Er-Cit-CD)up-conversion nanocomposite has been synthesized,which emits green fluorescence at 550nm under 980nm near-infrared(NIR)excitation.In the presence of oxidized 3,3',5,5'-tetramethylbenzidine(oxTMB),the green fluorescence is significantly quenched attributed to the fluorescence inner filter effect(IFE)between oxTMB and Y:Yb/Er-Cit-CD.When RA is intervened,blue oxTMB is reduced to colorless 3,3',5,5'-tetramethylbenzidine(TMB)inducing the recovery of up-conversion fluorescence.At the same time,colorimetric and photothermal signals readout can be easily achieved thanks to the color indication and photothermal effect of the oxTMB.The constructed Y:Yb/Er-Cit-CD/oxTMB sensor displays high sensitivity,visibility and simplicity for RA,and the limits of detection(LOD)for fluorescence,colorimetric and photothermal were 0.004μmol/L,0.036μmol/L and 0.043μmol/L,respectively.This sensing system is successfully performed for the detection of RA in food samples.
文摘This paper reports the preparation of yttrium oxide(Y_(2)O_(3))doped with various concentrations of Er^(3+)using high temperature synthesis method.Photoluminescence(PL)emission spectra of the samples were recorded at an excitation of 980 nm laser source.Two prominent peaks centered at 484 nm and 574 nm were found and attributed to the^(2)P3/2→^(4)I_(11/2)and^(4)S_(3/2)→^(4)I_(15/2),respectively.The sample with 2.5 mol%of Er^(3+)provided the optimum intensity in emission spectra.The sample with optimum PL emission was investigated for its thermoluminescence(TL)glow curve exhibited the second order kinetics.The peak TL intensity was found around 236°C,i.e.,towards high temperature which supports the fact of formation of deeper traps.Therefore,the material taken may be regarded as a good candidate for light emitting diode(LED)applications.
文摘The modification of NaYF4:Yb,Er(Tm) nanoparticles synthesized in the presence of an ionic surfactant is critical to their application in biological fields for better solubility and biocompatibility. In this work, NaYF4:Yb,Er(Tm) was transformed from insoluble, inactive to hydrophilic, biocompatible via ligand exchange modification with polyacrylic acid (PAA). Ligand exchange was carried out at room temperature when a colloidal solution of NaYF4:Yb,Er(Tm) in tetrahydrofuran (THF) was treated with excess PAA. The PAA modified NaYF4:Yb,Er(Tm) nanoparticles got better surface properties but with declined inner up-conversion fluorescence. Generally, coating an analogous layer of material outside the core nanoparticles can improve the optical properties of the core. Accordingly, NaYF4:Yb,Er(Tm)/NaYF4 nanoparticles were synthesized before PAA modification to avoid the optical intensity decaying. The result of fluorescence test proved that the water soluble NaYF4:Yb,Er(Tm)/NaYF4/PAA nanocomposites had a sound up-conversion property compared with that of NaYF4:Yb,Er(Tm)/PAA. Furthermore, the up-conversion fluorescence property of the nanocomposite varied with the doping ratio of Er(Tm) to Yb and the possible mechanism for this change was also discussed.
基金supported by the National Natural Science Foundation of China(Nos.22371218,21702153,52270070,and 21801194)the Wuhan Science and Technology Bureau(No.whkxjsj009)+1 种基金support of the Core Facility of Wuhan Universitythe Large-scale Instrument and Equipment Sharing Foundation of Wuhan University。
文摘Efficient conversion and synergistic solar energy utilization are critical for advancing low-carbon and sustainable development.In this study,two Pt(Ⅱ)-based metal/halogen-bonded organic frameworks(MXOFBen and MXOF-Anth)were designed to enhance photoconversion efficiency and enable multifunctional integration.The ligand L-terpyr is formed by coupling tripyridine with diphenylamine dipyridine,in which the tripyridine effectively acts as a metal-ligand to lower the band gap and promote nonradiative leaps,thereby enhancing the photoconversion ability.Meanwhile,diphenylamine dipyridine serves as a[N…I^(+)…N]halogen-bonding acceptor,imparting superhydrophilicity to the materials and increasing carrier density,further improving photocatalytic performance.Experimental results demonstrate that these two MXOFs achieve impressive interfacial water evaporation efficiencies of up to87.8%and 94.0%,respectively.Additionally,the materials exhibit excellent performance in photothermal power generation and photocatalysis of H_(2)O_(2).Notably,the MXOFs also deliver strong overall performance in integrated systems combining interfacial water evaporation with photothermal power generation or photocatalysis,underscoring their exceptional photoconversion efficiency and multifunctional potential.This work introduces a novel strategy by incorporating metal-ligand and halogen bonds,offering a pathway to enhance photoconversion efficiency and develop versatile materials for advanced solar energy applications,thereby fostering the progress of high-efficiency solar energy conversion and multifunctional organic materials.
基金Project supported by the National Natural Science Foundation of China (Grant No. 10804015 )the Science Foundation of the Education Department of Liaoning Province of China (Grant No. 2009A417)
文摘yb^3＋：Er^3＋ co-doped oxy-fluoride ceramics glass has been prepared. The mechanism of up-conversion emissions about Er^3＋ was discussed, and the temperature properties of green up-conversion fluorescence between 303 and 823 K were investigated. The results show that the sensitivity of this sample reaches its maximum value, about 0.0047 K^-1, when the temperature is 383 K, indicating that this kind of sample can be used as high temperature and high sensitivity optical temperature sensor.
文摘Over the past ten years,numerous papers have been published on the use of indocyanine green(ICG)fluorescence in liver surgery for hepatocellular carcinoma(HCC).There are many different applications.The first involves targeting superficial tumors in patients with macronodular cirrhosis and an irregular liver surface.In a minimally invasive setting,the lack of tactile feedback on the hepatic surface makes detecting subcapsular HCC with ultrasound alone challenging.ICG fusion images can mimic the tactile feedback of the hand and act as an ultrasound booster.ICG fluorescence can be used to evaluate tumor residues after minimally invasive thermal ablation.ICG fluorescence imaging can also be used to identify the grade of HCC early on and evaluate the microinvasive component.
