The SiO_(2) inverse opal photonic crystals(PC)with a three-dimensional macroporous structure were fabricated by the sacrificial template method,followed by infiltration of a pyrene derivative,1-(pyren-8-yl)but-3-en-1-...The SiO_(2) inverse opal photonic crystals(PC)with a three-dimensional macroporous structure were fabricated by the sacrificial template method,followed by infiltration of a pyrene derivative,1-(pyren-8-yl)but-3-en-1-amine(PEA),to achieve a formaldehyde(FA)-sensitive and fluorescence-enhanced sensing film.Utilizing the specific Aza-Cope rearrangement reaction of allylamine of PEA and FA to generate a strong fluorescent product emitted at approximately 480 nm,we chose a PC whose blue band edge of stopband overlapped with the fluorescence emission wavelength.In virtue of the fluorescence enhancement property derived from slow photon effect of PC,FA was detected highly selectively and sensitively.The limit of detection(LoD)was calculated to be 1.38 nmol/L.Furthermore,the fast detection of FA(within 1 min)is realized due to the interconnected three-dimensional macroporous structure of the inverse opal PC and its high specific surface area.The prepared sensing film can be used for the detection of FA in air,aquatic products and living cells.The very close FA content in indoor air to the result from FA detector,the recovery rate of 101.5%for detecting FA in aquatic products and fast fluorescence imaging in 2 min for living cells demonstrate the reliability and accuracy of our method in practical applications.展开更多
Endocrine disruptors such as bisphenol A(BPA)adversely affect the environment and human health.Laccases are used for the efficient biodegradation of various persistent organic pollutants in an environmentally safe man...Endocrine disruptors such as bisphenol A(BPA)adversely affect the environment and human health.Laccases are used for the efficient biodegradation of various persistent organic pollutants in an environmentally safe manner.However,the direct application of free laccases is generally hindered by short enzyme lifetimes,non-reusability,and the high cost of a single use.In this study,laccases were immobilized on a novel magnetic threedimensional poly(ethylene glycol)diacrylate(PEGDA)-chitosan(CS)inverse opal hydrogel(LAC@MPEGDA@CS@IOH).The immobilized laccase showed significant improvement in the BPA degradation performance and superior storage stability compared with the free laccase.91.1%of 100 mg/L BPA was removed by the LAC@MPEGDA@CS@IOH in 3 hr,whereas only 50.6%of BPA was removed by the same amount of the free laccase.Compared with the laccase,the outstanding BPA degradation efficiency of the LAC@MPEGDA@CS@IOH was maintained over a wider range of pH values and temperatures.Moreover,its relative activity of was maintained at 70.4%after 10 cycles,and the system performed well in actual water matrices.This efficientmethod for preparing immobilized laccases is simple and green,and it can be used to further develop ecofriendly biocatalysts to remove organic pollutants from wastewater.展开更多
Owing to its photonic band gap(PBG)and slow light effects,aniline black(AB)-poly(vinylidene fluoride)(PVDF)inverse opal(IO)photonic crystal(PC)was constructed to promote the utility of light and realize photothermal s...Owing to its photonic band gap(PBG)and slow light effects,aniline black(AB)-poly(vinylidene fluoride)(PVDF)inverse opal(IO)photonic crystal(PC)was constructed to promote the utility of light and realize photothermal synergetic catalysis.As a highly efficient reaction platform with the capability of restricting heat,a microreactor was introduced to further amplify the photothermal effects of near infrared(NIR)radiation.The photocatalytic efficiency of ZnO/0.5AB-PVDF IO(Z0.5A)increases 1.63-fold compared to that of pure ZnO film under a full solar spectrum,indicating the effectiveness of synergetic promotion by slow light and photothermal effects.Moreover,a 5.85-fold increase is achieved by combining Z0.5A with a microreactor compared to the film in a beaker.The photon localization effect of PVDF IO was further exemplified by finite-difference time-domain(FDTD)calculations.In conclusion,photonic crystal-microreactor enhanced photothermal catalysis has immense potential for alleviating the deteriorating water environment.展开更多
The colloidal crystal template or opal with a closed-packed face centered cubic (fcc) lattice, was prepared from monodisperse polystyrene (PS) spheres by gravity sedimentation. The template was used for the generatio...The colloidal crystal template or opal with a closed-packed face centered cubic (fcc) lattice, was prepared from monodisperse polystyrene (PS) spheres by gravity sedimentation. The template was used for the generation of photonic crystal. The template provided void space for infiltration of liquid precursor composed of titanium butyloxide, barium acetate, ethanol, and acetic acid. The opal composite was hydrolyzed, dried, sintered by heating for completely removing PS spheres to form BaTiO3 photonic crystals with inverse opal structure. The PS spheres were replaced by air spheres, which interconnected each other through the windows on the BaTiO3 wall. So both the BaTiO3 wall and air void constitute continuous phases.展开更多
Poor conductivity and sluggish Na^(+) diffusion kinetic are two major drawbacks for practical application of sodium super-ionic conductor(NASICON) in sodium-ion batteries. In this work, we report a simple approach to ...Poor conductivity and sluggish Na^(+) diffusion kinetic are two major drawbacks for practical application of sodium super-ionic conductor(NASICON) in sodium-ion batteries. In this work, we report a simple approach to synthesize quasi-inverse opal structural NASICON/N-doped carbon for the first time by a delicate one-pot solution-freeze drying-calcination process, aiming at fostering the overall electrochemical performance. Especially, the quasi-inverse opal structural Na_(3)V_(2)(PO_(4))_(3)/N-C(Q-NVP/N-C) displayed continuous pores, which provides interconnected channels for electrolyte permeation and abundant contacting interfaces between electrolyte and materials, resulting in faster kinetics of redox reaction and higher proportion of capacitive behavior.As a cathode material for sodium-ion batteries, the Q-NVP/N-C exhibits high specific capacity of 115 mAh·g^(-1) at 1C, still 61 mAh·g^(-1) at ultra-high current density of 100C,and a specific capacity of 89.7mAh·g^(-1) after 2000 cycles at 20C.This work displays the general validity of preparation method for not only Q-NVP/N-C,but also Na_(3)V_(2)(PO_(4))_(3),which provides a prospect for delicate synthesis of NASICON materials with excellent electrochemical performance.展开更多
A novel solvent-sensitive fluorescent actuator with reversibility has been obtained from carbon dots （CDs） inverse opals, which is prepared via infiltrating CDs solution into the interstice of colloidal crystal temp...A novel solvent-sensitive fluorescent actuator with reversibility has been obtained from carbon dots （CDs） inverse opals, which is prepared via infiltrating CDs solution into the interstice of colloidal crystal template, thermal polymerization of CDs materials and removing the colloidal template. The as-prepared CDs inverse opal actuator shows a bending angle of 75° in 10.2 s, bending rate of 7.35 （°）.s-1. In particular, the fluorescence intensity of the films varies during the actuating process. The actuating behavior is attributed to the inhomogeneous swelling/shrinking of the film, which originates from the gradient dewetting by solvent evaporation and hydrogen-bonding interaction between the solvent molecules and oxygen/hydrogen ions of CDs side chain. The CDs inverse opal actuator has the advantages of quick response, good repeatability and strong fluorescence, which gives an important insight into the design and manufacture of novel and advanced solvent-actuators.展开更多
The colloidal crystal template or opal with a closed-packed face-centered cubic （fcc） lattice was prepared from monodisperse polystyrene （PS） spheres by vertical sedimentation. The template provided void space for...The colloidal crystal template or opal with a closed-packed face-centered cubic （fcc） lattice was prepared from monodisperse polystyrene （PS） spheres by vertical sedimentation. The template provided void space for infiltration of monomer precursor composed of acrylate acid, acrylamide and ammonium-persulfate, as well as microgel from the subsequent copolymerization. The sample was immersed in dimethylbenzene for completely removing PS spheres to form PAM inverse opal hydrogels （IOHPAM） or PAM/PAA inverse opal hydrogels （IOHPAM/PAA） photonic crystals. The PS spheres were replaced by air spheres, which interconnected each other through the windows. The study of responses to pH show that there are two peaks for both IOHPAM and IOHPAM/PAA films, but the IOHPAM/PAA peaks shift to higher pH, and the peaks are independent with the AA content.展开更多
With the advantages of better mimicking the specificity of natural tissues,three-dimensional(3D)cell culture plays a major role in drug development,toxicity testing,and tissue engineering.However,existing scaffolds or...With the advantages of better mimicking the specificity of natural tissues,three-dimensional(3D)cell culture plays a major role in drug development,toxicity testing,and tissue engineering.However,existing scaffolds or microcarriers for 3D cell culture are often limited in size and show suboptimal performance in simulating the vascular complexes of living organisms.Therefore,we present a novel hierarchically inverse opal porous scaffold made via a simple microfluidic approach for promoting 3D cell co-culture techniques.The designed scaffold is constructed using a combined concept involving an emulsion droplet template and inert polymer polymerization.This work demonstrates that the resultant scaffolds ensure a sufficient supply of nutrients during cell culture,so as to achieve large-volume cell culture.In addition,by serially planting different cells in the scaffold,a 3D co-culture system of endothelial-cellencapsulated hepatocytes can be developed for constructing certain functional tissues.It is also demonstrated that the use of the proposed scaffold for a co-culture system helps hepatocytes to maintain specific in vivo functions.These hierarchically inverse opal scaffolds lay the foundation for 3D cell culture and even the construction of biomimetic tissues.展开更多
A novel method to fabricate composition- （IO） films using a positive sacrificial ZnO and topology-controlled ZnO/TiO2 inverse opals IO template has been developed. This method includes a two-step process, preparatio...A novel method to fabricate composition- （IO） films using a positive sacrificial ZnO and topology-controlled ZnO/TiO2 inverse opals IO template has been developed. This method includes a two-step process, preparation of ZnO IO by a simple electrochemical deposition using a self-assembly polystyrene colloidal crystal template and preparation of ZnO/TiO2 IO by a liquid phase deposition （LPD） process at room temperature. The composition and topology of ZnO/TiO2 IO can be easily controlled by changing the duration of the LPD. After 20 min LPD process, a ZnO/TiO2 composite IO with non-close-packed face-centered cubic air sphere array was obtained. Prolonging the duration to 60 min, a pure TiO2 IO （TIO-LPD60） with obviously thickened walls was formed. The formation mechanism for the compositional and topological variation was discussed. A preliminary study on UV photocatalytic property of the samples for degradation of methylene blue reveals that the composition and topology significantly influenced the photocatalytic activity of the IO film. The ZnO/TiO2 composite IO demonstrates a higher degree of activity than both pure ZnO and pure TiO2 IO, although they have a similar IO wall thickness. Moreover, with increasing IO wall thickness from -52 nm to -90 nm, TIO-LPD60 exhibits the highest level of photocatalytic performance.展开更多
A thermal-responsive photonic crystal material was fabricated by forming an inverse opal nanocomposite hydrogel of poly(N-isopropylacrylamide)(IONHPNIPAm)within the interstitial space of a polystyrene photonic crystal...A thermal-responsive photonic crystal material was fabricated by forming an inverse opal nanocomposite hydrogel of poly(N-isopropylacrylamide)(IONHPNIPAm)within the interstitial space of a polystyrene photonic crystal template.In IONHPNIPAm,PNIPAm were physically cross-linked with two kinds of nanoparticles(carbon dots and laponite clays).The integration of carbon dots and laponite clays for physical crosslinking endowed IONHPNIPAm sufficient strength and self-healing property.IONHPNIPAm films can be completely peeled from the substrates to be utilized as an independent photonic crystal material.The structural color and optical diffraction of the IONHPNIPAm exhibits a rapid reversible change in response to external thermal stimuli due to its physical cross-linking feature.Moreover,the IONHPNIPAm shows clear fluorescence due to the introduction of carbon dots,which enables a convenient way for chemical detection(such as the detection of silver ions).This stimuli-responsive photonic crystal materials based on physically cross-linked inverse opal nanocomposite hydrogels with fast response and good mechanical stability are promising for applications in the fields of smart optical detectors,thermal-responsive sensors and chemical detectors.展开更多
In this work,Z-scheme V_(2)O_(5) loaded fluorinated inverse opal carbon nitride(IO F-CN/V_(2)O_(5)) was synthesized as a product of ternary collaborative modification with heterostructure construction,element doping a...In this work,Z-scheme V_(2)O_(5) loaded fluorinated inverse opal carbon nitride(IO F-CN/V_(2)O_(5)) was synthesized as a product of ternary collaborative modification with heterostructure construction,element doping and inverse opal structure.The catalyst presented the highest photocatalytic activity and rate constant for degradation of typical organic pollutants Rhodamine B(RhB)and was also used for the efficient removal of antibiotics,represented by norfloxacin(NOR),sulfadiazine(SD)and levofloxacin(LVX).Characterizations confirmed its increased specific surface area,narrowed bandgap,and enhanced visible light utilization capacity.Further mechanism study including band structure study and electron paramagnetic resonance(EPR)proved the successful construction of Z-scheme heterojunction,which improved photogenerated charge carrier migration and provide sufficient free radicals for the degradation process.The combination of different modifications contributed to the synergetic improvement of removal efficiency towards different organic pollutants.展开更多
As a novel structure, inverse opal, with threedimensional periodic macropore and mesopore and huge specific surface area, has great promising applications. In this paper, tin dioxide (SnO_(2)) inverse opal films were ...As a novel structure, inverse opal, with threedimensional periodic macropore and mesopore and huge specific surface area, has great promising applications. In this paper, tin dioxide (SnO_(2)) inverse opal films were prepared with sol–gel method by cooperative opal template. The surface morphologies of SnO_(2)inverse opal films were examined by scanning electron microscopy (SEM), the inner structure of SnO_(2)inverse opal films was examined by transmission electron microscopy (TEM), the optical properties of SnO_(2)inverse opal films were studied and discussed in detail. Optical reflectance spectra reveal that, for the opal films, the wavelengths of the reflectance peak confirmed by the experimental reflectance spectra are consistent with the theoretical values;for the SnO_(2)inverse opal films, the wavelengths of the reflectance peak confirmed by the experimental reflectance spectra deviate from theoretical values largely.展开更多
The upconversion （UC） luminescence and color tunable properties of Tb3＋ ions were investigated by steady spectral under 980 LD excitation in the Cao.15ZrO.8501.85：Yb,Tb inverse opals fabricated by the self-assembl...The upconversion （UC） luminescence and color tunable properties of Tb3＋ ions were investigated by steady spectral under 980 LD excitation in the Cao.15ZrO.8501.85：Yb,Tb inverse opals fabricated by the self-assembly technique in combination with a sol-gel method. The inhibition of UC emission was inspected if the Tb3＋ UC emission band was in the regions of the photonic bandgap, while enhancement of the UC emission occurred if the UC emission band located at the edge of the bandgap. Color modification of the UC emission was successfully obtained by the suppression or enhancement effect of the photonic band gap on the UC emission.展开更多
Manipulation of the photoluminescence spectra of light-emitting materials doped in three-dimensional （3D） inverse opal photonic crystals is investigated. Quinacrine dihydrochloride molecules doped highly ordered SiO...Manipulation of the photoluminescence spectra of light-emitting materials doped in three-dimensional （3D） inverse opal photonic crystals is investigated. Quinacrine dihydrochloride molecules doped highly ordered SiO2 inverse opal is successfully synthesized by co-assembly combined with double-substrate vertical infiltrate method. The quinacrine dihydrochloride-doped and-undoped SiO2 inverse opals each exhibit an apparent photonic band gap （PBG） in the visible light region. Significant suppression of the emission is observed when the PBG is overlapped with the quinacrine dihydrochloride emission bands. The mechanism of suppression effect of PBG in inverse opal on the fluorescence intensity of quinacrine dihydrochloride molecules is studied.展开更多
A novel and fluorescence retention inverse opal has been achieved from organosilane-polymerized carbon dots（SiCDs）, which is prepared via infiltrating SiCD solution into the interstice of photonic crystal（PC） temp...A novel and fluorescence retention inverse opal has been achieved from organosilane-polymerized carbon dots（SiCDs）, which is prepared via infiltrating SiCD solution into the interstice of photonic crystal（PC） template, low temperature treatment, heating polymerization and removing the colloidal template. The as-prepared SiCD inverse opals demonstrate close-cell structure, which is completely different from conventional open-cell structure. Then the fluorescence signal of as-prepared sample keeps almost unchanged in CuCl suspension while the fluorescence of SiCD solution can be quenched by CuCl suspension through an effective electron transfer process. This phenomenon can be attributed to the combined effect of high hydrostatic pressure in the pore structure, stable crosslinking network and fluorescence enhancement by PC structure. The SiCD inverse opals have advantages of unique close-cell structure, easy preparation and good repeatability that give an important insight into the design and manufacture of novel and advanced optical devices.展开更多
Efficient solar light harvesting is essential for high-performance photocatalysts.Here,Rigorous CoupledWave Analysis(RCWA)computational method is used to investigate and optimize the optical absorption of TiO_(2)-BiVO...Efficient solar light harvesting is essential for high-performance photocatalysts.Here,Rigorous CoupledWave Analysis(RCWA)computational method is used to investigate and optimize the optical absorption of TiO_(2)-BiVO_(4) inverse opal(IO)structures under varying light incidence angles and pore-filling medium(air or water).Simulations were validated against experimental reflectance data.They revealed that small-pore IOs strongly absorb in the UV-C and UV-B regions due to the slow photon effect,making them ideal for sterilization and water disinfection.Medium-and large-pore IOs benefit from additional slow photon effect at the 2nd order photonic band gap,enhancing absorption across both UV and visible regions.Medium-pore IOs are suited for indoor air treatment and water purification,while large-pore IOs with the highest photon flux enhancement enable solar-driven photocatalysis such as outdoor pollutant removal and hydrogen production.For all tested IO designs,the absorbed photon flux exceeds that of equivalent planar slabs,highlighting the advantage of photonic structuring for sustainable photocatalytic applications.展开更多
Development of highly active and stable acidic oxygen evolution reaction catalyst is very important for efficient water splitting while remains challenging.Herein,we report a highly ordered RuO_(2)/WO_(3) inverse opal...Development of highly active and stable acidic oxygen evolution reaction catalyst is very important for efficient water splitting while remains challenging.Herein,we report a highly ordered RuO_(2)/WO_(3) inverse opals(IOs)catalyst to address the bottleneck problem of see-saw relationship between activity and stability,in which the crystalline and corrosion-resistant WO_(3) facilitates electron transport and stabilizes RuO_(2),whereas the lattice mismatch-induced amorphous-dominated RuO_(2) provides abundant unsaturated coordination sites to enhance the acidic oxygen evolution reaction(OER)activity.Consequently,the RuO_(2)/WO_(3) IOs demonstrates outstanding acidic OER performance in terms of a low overpotential of 180 mV to reach 10 mA·cm^(-2),and excellent stability for maintaining 100 hours continuous test.Experimental characterizations and density functional theory calculations reveal that interface coupling between WO_(3) and RuO_(2) can enhance the spin polarization of electrons and increase the overlaps of the electronic projected density of states between the Ru d orbitals of active metal and the O p orbitals of oxygen intermediates,facilitating OER pathway to switch from lattice oxygen mechanism to adsorbate evolution mechanism,which significantly decreases the reaction energy barrier of OER process.Meanwhile,the rich oxygen vacancies and WO_(3) supports in the heterostructures could inhibit the over-oxidation of Ru species,so as to enhance the activity and stability simultaneously.展开更多
Direct conversion of CO_(2)to chemical fuels by photocatalysis has emerged as a promising strategy to alleviate global warming and renewable energy shortage issues.Halide perovskites with unique photoelectronic attrib...Direct conversion of CO_(2)to chemical fuels by photocatalysis has emerged as a promising strategy to alleviate global warming and renewable energy shortage issues.Halide perovskites with unique photoelectronic attributes show great potential for CO_(2)photoreduction.However,their low photogenerated electron-hole efficiency and intrinsic structural instability in aqueous solution are still a significant challenge.In this work,we propose a universal facile strategy of robust carbon dots(CDs)mediated inverse opal perovskite(IOP)free-standing film,which is demonstrated as a uniform porous photocatalytic platform for efficient CO_(2)photoreduction.Due to the grain boundary passivation effect of CDs,the mechanical strength and water resistance of CDs/IOP films are greatly improved.By the synergetic effects of IO structure and CDs cocatalyst,highly selective CO evolution rate of 60.25μmol·g^(−1)·h^(−1)from photocatalytic CO_(2)reduction is achieved on typical CDs/CsPbBr3 IOP film,which is 15.6 times higher than that of opal CsPbBr3,since the enhanced lifetime of photogenerated electrons-holes and light/mass transfers.This work provides a new opportunity for robust and highly stable perovskite photocatalyst preparation to address the environmental and energy issues via an efficient photocatalysis process.展开更多
ABSTRACT:The development of highly sensitive and rapidresponse/recovery room-temperature NH_(3) sensors is critically demanded for environmental monitoring and healthcare diagnostics,yet remains scientifically challen...ABSTRACT:The development of highly sensitive and rapidresponse/recovery room-temperature NH_(3) sensors is critically demanded for environmental monitoring and healthcare diagnostics,yet remains scientifically challenging.Inspired by the two-dimensional ordered macroporous structure of peacock feathers,two-dimensional inverse opal(2DIO)polyaniline/silver(PANI/Ag)composites were fabricated via a sacrificial templating method.By integrating the advantages of gas diffusion of highly ordered macroporous structures with the catalytic activity of Ag,significant improvements in NH_(3) sensing performance were achieved.Computational fluid dynamics(CFD)simulations demonstrated that the 2DIO structure induced vortex effects,which significantly reduced the gas velocity.Concurrently,macroporous channels(~240 nm diameter)enhanced adsorption/desorption kinetics.The fabricated 2DIO PANI/Ag sensor exhibited a remarkable response of 1153%to 100 ppm NH_(3),with ultra-fast response/recovery times of 3 s/56 s,exhibiting a 420-fold improvement in response/recovery speed compared to pure PANI(126 s/325 s).A further developed wearable detection module successfully discriminated exhalation signals between simulated chronic kidney disease(CKD)patients and healthy individuals,providing a new strategy for noninvasive medical diagnosis.In-situ Fourier transform infrared spectroscopy(in-situ FT-IR)real-time tracking of NH_(3) adsorption/desorption processes confirms a chemisorption-dominated sensing mechanism.Density functional theory(DFT)calculations showed that the charge transfer at the PANI/Ag interface enhanced the adsorption of NH_(3),which significantly enhanced the molecular affinity.This study provides a viable pathway for developing high-performance flexible NH_(3) gas sensors through an interdisciplinary approach combining structural bionics,simulation optimization,theoretical analysis,and experimental validation.展开更多
Herein,we report a three-dimensional porous TiO_(2)/Fe_(2)TiO_(5)/Fe_(2)O_(3)(TFF)inverse opal through in situ thermal solid reactions for photoelectrochemical water splitting.The Fe_(2)TiO_(5) interfacial layer withi...Herein,we report a three-dimensional porous TiO_(2)/Fe_(2)TiO_(5)/Fe_(2)O_(3)(TFF)inverse opal through in situ thermal solid reactions for photoelectrochemical water splitting.The Fe_(2)TiO_(5) interfacial layer within TFF acting as a bridge to tightly connect to TiO_(2) and Fe_(2)O_(3) reduces the interfacial charge transfer resistance,and suppresses the bulk carrier recombination.The optimized TFF displays a remarkable photocurrent density of 0.54mAcm^(-2) at 1.23V vs.reversible hydrogen electrode(RHE),which is 25 times higher than that of TiO_(2)/Fe_(2)O_(3)(TF)inverse opal(0.02mAcm^(-2) at 1.23V vs.RHE).The charge transfer rate in TFF inverse opal is 2-8 times higher than that of TF in the potential range of 0.7-1.5V vs.RHE.The effects of the Fe_(2)TiO_(5) interfacial layer are further revealed by X-ray absorption spectroscopy and intensity-modulated photocurrent spectroscopy.This work offers an interfacial engineering protocol to improve charge separation and transfer for efficient solar water splitting.展开更多
基金supported by the National Natural Science Foundation of China(21663032 and 22061041)the Open Sharing Platform for Scientific and Technological Resources of Shaanxi Province(2021PT-004)the National Innovation and Entrepreneurship Training Program for College Students of China(S202110719044)。
文摘The SiO_(2) inverse opal photonic crystals(PC)with a three-dimensional macroporous structure were fabricated by the sacrificial template method,followed by infiltration of a pyrene derivative,1-(pyren-8-yl)but-3-en-1-amine(PEA),to achieve a formaldehyde(FA)-sensitive and fluorescence-enhanced sensing film.Utilizing the specific Aza-Cope rearrangement reaction of allylamine of PEA and FA to generate a strong fluorescent product emitted at approximately 480 nm,we chose a PC whose blue band edge of stopband overlapped with the fluorescence emission wavelength.In virtue of the fluorescence enhancement property derived from slow photon effect of PC,FA was detected highly selectively and sensitively.The limit of detection(LoD)was calculated to be 1.38 nmol/L.Furthermore,the fast detection of FA(within 1 min)is realized due to the interconnected three-dimensional macroporous structure of the inverse opal PC and its high specific surface area.The prepared sensing film can be used for the detection of FA in air,aquatic products and living cells.The very close FA content in indoor air to the result from FA detector,the recovery rate of 101.5%for detecting FA in aquatic products and fast fluorescence imaging in 2 min for living cells demonstrate the reliability and accuracy of our method in practical applications.
基金supported by the National Key Research and Development Program of China(Nos.2022YFC3703700 and 2021YFA0910300)the National Natural Science Foundation of China(No.22125606)the Special Project of Ecological Environmental Technology for Carbon Dioxide Emissions Peak and Carbon Neutrality(No.RCEES-TDZ-2021-21).
文摘Endocrine disruptors such as bisphenol A(BPA)adversely affect the environment and human health.Laccases are used for the efficient biodegradation of various persistent organic pollutants in an environmentally safe manner.However,the direct application of free laccases is generally hindered by short enzyme lifetimes,non-reusability,and the high cost of a single use.In this study,laccases were immobilized on a novel magnetic threedimensional poly(ethylene glycol)diacrylate(PEGDA)-chitosan(CS)inverse opal hydrogel(LAC@MPEGDA@CS@IOH).The immobilized laccase showed significant improvement in the BPA degradation performance and superior storage stability compared with the free laccase.91.1%of 100 mg/L BPA was removed by the LAC@MPEGDA@CS@IOH in 3 hr,whereas only 50.6%of BPA was removed by the same amount of the free laccase.Compared with the laccase,the outstanding BPA degradation efficiency of the LAC@MPEGDA@CS@IOH was maintained over a wider range of pH values and temperatures.Moreover,its relative activity of was maintained at 70.4%after 10 cycles,and the system performed well in actual water matrices.This efficientmethod for preparing immobilized laccases is simple and green,and it can be used to further develop ecofriendly biocatalysts to remove organic pollutants from wastewater.
文摘Owing to its photonic band gap(PBG)and slow light effects,aniline black(AB)-poly(vinylidene fluoride)(PVDF)inverse opal(IO)photonic crystal(PC)was constructed to promote the utility of light and realize photothermal synergetic catalysis.As a highly efficient reaction platform with the capability of restricting heat,a microreactor was introduced to further amplify the photothermal effects of near infrared(NIR)radiation.The photocatalytic efficiency of ZnO/0.5AB-PVDF IO(Z0.5A)increases 1.63-fold compared to that of pure ZnO film under a full solar spectrum,indicating the effectiveness of synergetic promotion by slow light and photothermal effects.Moreover,a 5.85-fold increase is achieved by combining Z0.5A with a microreactor compared to the film in a beaker.The photon localization effect of PVDF IO was further exemplified by finite-difference time-domain(FDTD)calculations.In conclusion,photonic crystal-microreactor enhanced photothermal catalysis has immense potential for alleviating the deteriorating water environment.
文摘The colloidal crystal template or opal with a closed-packed face centered cubic (fcc) lattice, was prepared from monodisperse polystyrene (PS) spheres by gravity sedimentation. The template was used for the generation of photonic crystal. The template provided void space for infiltration of liquid precursor composed of titanium butyloxide, barium acetate, ethanol, and acetic acid. The opal composite was hydrolyzed, dried, sintered by heating for completely removing PS spheres to form BaTiO3 photonic crystals with inverse opal structure. The PS spheres were replaced by air spheres, which interconnected each other through the windows on the BaTiO3 wall. So both the BaTiO3 wall and air void constitute continuous phases.
基金the National Natural Science Foundation of China(Nos.22105059 and 2210051199)the Talent Introduction Program of Hebei Agricultural University(No.YJ201810)+3 种基金Qingdao Source Innovation Project(No.19-6-2-19-cg)the Natural Science Foundation of Shandong Province(No.ZR2021QE192)the Natural Science Foundation of Hebei Province(No.B2019204009)the China Postdoctoral Science Foundation(No.2018M630747)。
文摘Poor conductivity and sluggish Na^(+) diffusion kinetic are two major drawbacks for practical application of sodium super-ionic conductor(NASICON) in sodium-ion batteries. In this work, we report a simple approach to synthesize quasi-inverse opal structural NASICON/N-doped carbon for the first time by a delicate one-pot solution-freeze drying-calcination process, aiming at fostering the overall electrochemical performance. Especially, the quasi-inverse opal structural Na_(3)V_(2)(PO_(4))_(3)/N-C(Q-NVP/N-C) displayed continuous pores, which provides interconnected channels for electrolyte permeation and abundant contacting interfaces between electrolyte and materials, resulting in faster kinetics of redox reaction and higher proportion of capacitive behavior.As a cathode material for sodium-ion batteries, the Q-NVP/N-C exhibits high specific capacity of 115 mAh·g^(-1) at 1C, still 61 mAh·g^(-1) at ultra-high current density of 100C,and a specific capacity of 89.7mAh·g^(-1) after 2000 cycles at 20C.This work displays the general validity of preparation method for not only Q-NVP/N-C,but also Na_(3)V_(2)(PO_(4))_(3),which provides a prospect for delicate synthesis of NASICON materials with excellent electrochemical performance.
基金the Ministry of Science and Technology of China(Nos.2016YFA0200803 and2016YFB0402004)the National Natural Science Foundation of China(Nos.51673207 and 51373183)Scientific Research Fund of Hunan Provincial Science and Technology Department(No.09236)
文摘A novel solvent-sensitive fluorescent actuator with reversibility has been obtained from carbon dots （CDs） inverse opals, which is prepared via infiltrating CDs solution into the interstice of colloidal crystal template, thermal polymerization of CDs materials and removing the colloidal template. The as-prepared CDs inverse opal actuator shows a bending angle of 75° in 10.2 s, bending rate of 7.35 （°）.s-1. In particular, the fluorescence intensity of the films varies during the actuating process. The actuating behavior is attributed to the inhomogeneous swelling/shrinking of the film, which originates from the gradient dewetting by solvent evaporation and hydrogen-bonding interaction between the solvent molecules and oxygen/hydrogen ions of CDs side chain. The CDs inverse opal actuator has the advantages of quick response, good repeatability and strong fluorescence, which gives an important insight into the design and manufacture of novel and advanced solvent-actuators.
基金supported by the National Natural Science Foundation of China(No.50473044).
文摘The colloidal crystal template or opal with a closed-packed face-centered cubic （fcc） lattice was prepared from monodisperse polystyrene （PS） spheres by vertical sedimentation. The template provided void space for infiltration of monomer precursor composed of acrylate acid, acrylamide and ammonium-persulfate, as well as microgel from the subsequent copolymerization. The sample was immersed in dimethylbenzene for completely removing PS spheres to form PAM inverse opal hydrogels （IOHPAM） or PAM/PAA inverse opal hydrogels （IOHPAM/PAA） photonic crystals. The PS spheres were replaced by air spheres, which interconnected each other through the windows. The study of responses to pH show that there are two peaks for both IOHPAM and IOHPAM/PAA films, but the IOHPAM/PAA peaks shift to higher pH, and the peaks are independent with the AA content.
基金the National Key Research and Development Program of China(2020YFA0908200)the National Natural Science Foundation of China(52073060,32101159,and 61927805)+1 种基金the Shenzhen Fundamental Research Program(JCYJ20190813152616459)the Wenzhou Institute,University of Chinese Academy of Sciences(WIUCAS)’startup fund(WIUCASQD2019007).
文摘With the advantages of better mimicking the specificity of natural tissues,three-dimensional(3D)cell culture plays a major role in drug development,toxicity testing,and tissue engineering.However,existing scaffolds or microcarriers for 3D cell culture are often limited in size and show suboptimal performance in simulating the vascular complexes of living organisms.Therefore,we present a novel hierarchically inverse opal porous scaffold made via a simple microfluidic approach for promoting 3D cell co-culture techniques.The designed scaffold is constructed using a combined concept involving an emulsion droplet template and inert polymer polymerization.This work demonstrates that the resultant scaffolds ensure a sufficient supply of nutrients during cell culture,so as to achieve large-volume cell culture.In addition,by serially planting different cells in the scaffold,a 3D co-culture system of endothelial-cellencapsulated hepatocytes can be developed for constructing certain functional tissues.It is also demonstrated that the use of the proposed scaffold for a co-culture system helps hepatocytes to maintain specific in vivo functions.These hierarchically inverse opal scaffolds lay the foundation for 3D cell culture and even the construction of biomimetic tissues.
文摘A novel method to fabricate composition- （IO） films using a positive sacrificial ZnO and topology-controlled ZnO/TiO2 inverse opals IO template has been developed. This method includes a two-step process, preparation of ZnO IO by a simple electrochemical deposition using a self-assembly polystyrene colloidal crystal template and preparation of ZnO/TiO2 IO by a liquid phase deposition （LPD） process at room temperature. The composition and topology of ZnO/TiO2 IO can be easily controlled by changing the duration of the LPD. After 20 min LPD process, a ZnO/TiO2 composite IO with non-close-packed face-centered cubic air sphere array was obtained. Prolonging the duration to 60 min, a pure TiO2 IO （TIO-LPD60） with obviously thickened walls was formed. The formation mechanism for the compositional and topological variation was discussed. A preliminary study on UV photocatalytic property of the samples for degradation of methylene blue reveals that the composition and topology significantly influenced the photocatalytic activity of the IO film. The ZnO/TiO2 composite IO demonstrates a higher degree of activity than both pure ZnO and pure TiO2 IO, although they have a similar IO wall thickness. Moreover, with increasing IO wall thickness from -52 nm to -90 nm, TIO-LPD60 exhibits the highest level of photocatalytic performance.
基金Funded by the National Natural Science Foundation of China(No.51873167)the National Innovation and Entrepreneurship Training Program for College Students(No.S202010497024)。
文摘A thermal-responsive photonic crystal material was fabricated by forming an inverse opal nanocomposite hydrogel of poly(N-isopropylacrylamide)(IONHPNIPAm)within the interstitial space of a polystyrene photonic crystal template.In IONHPNIPAm,PNIPAm were physically cross-linked with two kinds of nanoparticles(carbon dots and laponite clays).The integration of carbon dots and laponite clays for physical crosslinking endowed IONHPNIPAm sufficient strength and self-healing property.IONHPNIPAm films can be completely peeled from the substrates to be utilized as an independent photonic crystal material.The structural color and optical diffraction of the IONHPNIPAm exhibits a rapid reversible change in response to external thermal stimuli due to its physical cross-linking feature.Moreover,the IONHPNIPAm shows clear fluorescence due to the introduction of carbon dots,which enables a convenient way for chemical detection(such as the detection of silver ions).This stimuli-responsive photonic crystal materials based on physically cross-linked inverse opal nanocomposite hydrogels with fast response and good mechanical stability are promising for applications in the fields of smart optical detectors,thermal-responsive sensors and chemical detectors.
基金the National Natural Science Foundation of China(Nos.21777044 and 22076046,22176061)the Science and Technology Commission of Shanghai Municipality(Nos.19ZR1472400,19230711300 and 20DZ2250400)。
文摘In this work,Z-scheme V_(2)O_(5) loaded fluorinated inverse opal carbon nitride(IO F-CN/V_(2)O_(5)) was synthesized as a product of ternary collaborative modification with heterostructure construction,element doping and inverse opal structure.The catalyst presented the highest photocatalytic activity and rate constant for degradation of typical organic pollutants Rhodamine B(RhB)and was also used for the efficient removal of antibiotics,represented by norfloxacin(NOR),sulfadiazine(SD)and levofloxacin(LVX).Characterizations confirmed its increased specific surface area,narrowed bandgap,and enhanced visible light utilization capacity.Further mechanism study including band structure study and electron paramagnetic resonance(EPR)proved the successful construction of Z-scheme heterojunction,which improved photogenerated charge carrier migration and provide sufficient free radicals for the degradation process.The combination of different modifications contributed to the synergetic improvement of removal efficiency towards different organic pollutants.
基金financially supported by the National Natural Science Foundation of China (No. 51072177)Jiangsu Province Environmental Material Key Laboratory Project (No. 017375003)Jiangsu Ordinary University Graduate Students Scientific Research Innovation Project (No. CXZZ12_0896)。
文摘As a novel structure, inverse opal, with threedimensional periodic macropore and mesopore and huge specific surface area, has great promising applications. In this paper, tin dioxide (SnO_(2)) inverse opal films were prepared with sol–gel method by cooperative opal template. The surface morphologies of SnO_(2)inverse opal films were examined by scanning electron microscopy (SEM), the inner structure of SnO_(2)inverse opal films was examined by transmission electron microscopy (TEM), the optical properties of SnO_(2)inverse opal films were studied and discussed in detail. Optical reflectance spectra reveal that, for the opal films, the wavelengths of the reflectance peak confirmed by the experimental reflectance spectra are consistent with the theoretical values;for the SnO_(2)inverse opal films, the wavelengths of the reflectance peak confirmed by the experimental reflectance spectra deviate from theoretical values largely.
基金Project supported by the Natural Science Foundation of Yunnan Province (2010ZC038)the Postdoctoral Science Foundation of China(20110491759)+3 种基金Open Foundation of Key Lab of Advanced Materials in Rare&Precious and Non-ferrous Metals, Ministry of EducationOpen Foundation of Key Lab of Advanced Materials of Yunnan Province (ZDS2010011B)Education Department Foundation of Yunnan Province (2011Y348)Analysis and Measurement Foundation of Kunming University of Science and Technology (2011011)
文摘The upconversion （UC） luminescence and color tunable properties of Tb3＋ ions were investigated by steady spectral under 980 LD excitation in the Cao.15ZrO.8501.85：Yb,Tb inverse opals fabricated by the self-assembly technique in combination with a sol-gel method. The inhibition of UC emission was inspected if the Tb3＋ UC emission band was in the regions of the photonic bandgap, while enhancement of the UC emission occurred if the UC emission band located at the edge of the bandgap. Color modification of the UC emission was successfully obtained by the suppression or enhancement effect of the photonic band gap on the UC emission.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.91122022 and 51172209)the Natural Science Foundation of Zhejiang Province of of China(Grant No.LR12E02001)
文摘Manipulation of the photoluminescence spectra of light-emitting materials doped in three-dimensional （3D） inverse opal photonic crystals is investigated. Quinacrine dihydrochloride molecules doped highly ordered SiO2 inverse opal is successfully synthesized by co-assembly combined with double-substrate vertical infiltrate method. The quinacrine dihydrochloride-doped and-undoped SiO2 inverse opals each exhibit an apparent photonic band gap （PBG） in the visible light region. Significant suppression of the emission is observed when the PBG is overlapped with the quinacrine dihydrochloride emission bands. The mechanism of suppression effect of PBG in inverse opal on the fluorescence intensity of quinacrine dihydrochloride molecules is studied.
基金financially supported by the Ministry of Science and Technology of China (Nos.2016YFA0200803 and 2016YFB0402004)the National Natural Science Foundation of China (Nos.51673207 and 51373183)
文摘A novel and fluorescence retention inverse opal has been achieved from organosilane-polymerized carbon dots（SiCDs）, which is prepared via infiltrating SiCD solution into the interstice of photonic crystal（PC） template, low temperature treatment, heating polymerization and removing the colloidal template. The as-prepared SiCD inverse opals demonstrate close-cell structure, which is completely different from conventional open-cell structure. Then the fluorescence signal of as-prepared sample keeps almost unchanged in CuCl suspension while the fluorescence of SiCD solution can be quenched by CuCl suspension through an effective electron transfer process. This phenomenon can be attributed to the combined effect of high hydrostatic pressure in the pore structure, stable crosslinking network and fluorescence enhancement by PC structure. The SiCD inverse opals have advantages of unique close-cell structure, easy preparation and good repeatability that give an important insight into the design and manufacture of novel and advanced optical devices.
基金supported by the FNRS-FRFC,the Walloon Region,and the University of Namur(Conventions No.2.5020.11,GEQ U.G006.15,1610468,RW/GEQ2016 et U.G011.22)funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska Curie grant agreement n°101034383。
文摘Efficient solar light harvesting is essential for high-performance photocatalysts.Here,Rigorous CoupledWave Analysis(RCWA)computational method is used to investigate and optimize the optical absorption of TiO_(2)-BiVO_(4) inverse opal(IO)structures under varying light incidence angles and pore-filling medium(air or water).Simulations were validated against experimental reflectance data.They revealed that small-pore IOs strongly absorb in the UV-C and UV-B regions due to the slow photon effect,making them ideal for sterilization and water disinfection.Medium-and large-pore IOs benefit from additional slow photon effect at the 2nd order photonic band gap,enhancing absorption across both UV and visible regions.Medium-pore IOs are suited for indoor air treatment and water purification,while large-pore IOs with the highest photon flux enhancement enable solar-driven photocatalysis such as outdoor pollutant removal and hydrogen production.For all tested IO designs,the absorbed photon flux exceeds that of equivalent planar slabs,highlighting the advantage of photonic structuring for sustainable photocatalytic applications.
基金support by the National Natural Science Foundation of China(No.51772213)Fundamental Research Funds for the Central Universities.
文摘Development of highly active and stable acidic oxygen evolution reaction catalyst is very important for efficient water splitting while remains challenging.Herein,we report a highly ordered RuO_(2)/WO_(3) inverse opals(IOs)catalyst to address the bottleneck problem of see-saw relationship between activity and stability,in which the crystalline and corrosion-resistant WO_(3) facilitates electron transport and stabilizes RuO_(2),whereas the lattice mismatch-induced amorphous-dominated RuO_(2) provides abundant unsaturated coordination sites to enhance the acidic oxygen evolution reaction(OER)activity.Consequently,the RuO_(2)/WO_(3) IOs demonstrates outstanding acidic OER performance in terms of a low overpotential of 180 mV to reach 10 mA·cm^(-2),and excellent stability for maintaining 100 hours continuous test.Experimental characterizations and density functional theory calculations reveal that interface coupling between WO_(3) and RuO_(2) can enhance the spin polarization of electrons and increase the overlaps of the electronic projected density of states between the Ru d orbitals of active metal and the O p orbitals of oxygen intermediates,facilitating OER pathway to switch from lattice oxygen mechanism to adsorbate evolution mechanism,which significantly decreases the reaction energy barrier of OER process.Meanwhile,the rich oxygen vacancies and WO_(3) supports in the heterostructures could inhibit the over-oxidation of Ru species,so as to enhance the activity and stability simultaneously.
基金supported by the National Natural Science Foundation of China(No.22278225)Jiangsu Specially-Appointed Professor Program,and Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).
文摘Direct conversion of CO_(2)to chemical fuels by photocatalysis has emerged as a promising strategy to alleviate global warming and renewable energy shortage issues.Halide perovskites with unique photoelectronic attributes show great potential for CO_(2)photoreduction.However,their low photogenerated electron-hole efficiency and intrinsic structural instability in aqueous solution are still a significant challenge.In this work,we propose a universal facile strategy of robust carbon dots(CDs)mediated inverse opal perovskite(IOP)free-standing film,which is demonstrated as a uniform porous photocatalytic platform for efficient CO_(2)photoreduction.Due to the grain boundary passivation effect of CDs,the mechanical strength and water resistance of CDs/IOP films are greatly improved.By the synergetic effects of IO structure and CDs cocatalyst,highly selective CO evolution rate of 60.25μmol·g^(−1)·h^(−1)from photocatalytic CO_(2)reduction is achieved on typical CDs/CsPbBr3 IOP film,which is 15.6 times higher than that of opal CsPbBr3,since the enhanced lifetime of photogenerated electrons-holes and light/mass transfers.This work provides a new opportunity for robust and highly stable perovskite photocatalyst preparation to address the environmental and energy issues via an efficient photocatalysis process.
基金financial support from the National Natural Science Foundation of China(Nos.22208325 and 22409190)the National Key R&D Program of China(Nos.2023YFB3809400 and 2022YFE0138100)+2 种基金China Postdoctoral Science Foundation(No.2023M732964)Science and Technology Research and Development Projects of Henan Province(No.252102321029)the Cooperation Foundation of Dalian National Laboratory for Clean Energy of the Chinese Academy of Sciences(No.DNL202015).
文摘ABSTRACT:The development of highly sensitive and rapidresponse/recovery room-temperature NH_(3) sensors is critically demanded for environmental monitoring and healthcare diagnostics,yet remains scientifically challenging.Inspired by the two-dimensional ordered macroporous structure of peacock feathers,two-dimensional inverse opal(2DIO)polyaniline/silver(PANI/Ag)composites were fabricated via a sacrificial templating method.By integrating the advantages of gas diffusion of highly ordered macroporous structures with the catalytic activity of Ag,significant improvements in NH_(3) sensing performance were achieved.Computational fluid dynamics(CFD)simulations demonstrated that the 2DIO structure induced vortex effects,which significantly reduced the gas velocity.Concurrently,macroporous channels(~240 nm diameter)enhanced adsorption/desorption kinetics.The fabricated 2DIO PANI/Ag sensor exhibited a remarkable response of 1153%to 100 ppm NH_(3),with ultra-fast response/recovery times of 3 s/56 s,exhibiting a 420-fold improvement in response/recovery speed compared to pure PANI(126 s/325 s).A further developed wearable detection module successfully discriminated exhalation signals between simulated chronic kidney disease(CKD)patients and healthy individuals,providing a new strategy for noninvasive medical diagnosis.In-situ Fourier transform infrared spectroscopy(in-situ FT-IR)real-time tracking of NH_(3) adsorption/desorption processes confirms a chemisorption-dominated sensing mechanism.Density functional theory(DFT)calculations showed that the charge transfer at the PANI/Ag interface enhanced the adsorption of NH_(3),which significantly enhanced the molecular affinity.This study provides a viable pathway for developing high-performance flexible NH_(3) gas sensors through an interdisciplinary approach combining structural bionics,simulation optimization,theoretical analysis,and experimental validation.
基金supported by the National Natural Science Foundation of China(21771001 and 51872002)Anhui Provincial Natural Science Foundation(1708085ME120)+2 种基金the Program of Anhui Scientific and Technical Leaders Reserve Candidates(2018RH168)the Scholar Program for the Outstanding Innovative Talent of College Discipline(Specialty)the doctoral start-up fund and open fund for Discipline Construction,Institute of Physical Science and Information Technology,Anhui University.
文摘Herein,we report a three-dimensional porous TiO_(2)/Fe_(2)TiO_(5)/Fe_(2)O_(3)(TFF)inverse opal through in situ thermal solid reactions for photoelectrochemical water splitting.The Fe_(2)TiO_(5) interfacial layer within TFF acting as a bridge to tightly connect to TiO_(2) and Fe_(2)O_(3) reduces the interfacial charge transfer resistance,and suppresses the bulk carrier recombination.The optimized TFF displays a remarkable photocurrent density of 0.54mAcm^(-2) at 1.23V vs.reversible hydrogen electrode(RHE),which is 25 times higher than that of TiO_(2)/Fe_(2)O_(3)(TF)inverse opal(0.02mAcm^(-2) at 1.23V vs.RHE).The charge transfer rate in TFF inverse opal is 2-8 times higher than that of TF in the potential range of 0.7-1.5V vs.RHE.The effects of the Fe_(2)TiO_(5) interfacial layer are further revealed by X-ray absorption spectroscopy and intensity-modulated photocurrent spectroscopy.This work offers an interfacial engineering protocol to improve charge separation and transfer for efficient solar water splitting.
