The main chemical constituents of the genus Polygonum(Polygonaceae)are flavonoids,quinones,phenylpropanoids,and terpenoids,which show anticancer,antitumor,anti-oxidative,anti-inflammatory,analgesic,antibacterial,insec...The main chemical constituents of the genus Polygonum(Polygonaceae)are flavonoids,quinones,phenylpropanoids,and terpenoids,which show anticancer,antitumor,anti-oxidative,anti-inflammatory,analgesic,antibacterial,insecticidal,and other pharmacological effects.This paper summarizes research on the chemical constituents and pharmacological effects of compounds from the genus Polygonum in last15years.展开更多
Neurocardiology is an interdisciplinary field that studies the interactions between the nervous and cardiovascular systems,encompassing research across the entire spectrum,from molecular mechanisms to clinical diagnos...Neurocardiology is an interdisciplinary field that studies the interactions between the nervous and cardiovascular systems,encompassing research across the entire spectrum,from molecular mechanisms to clinical diagnosis and treatment.The disease types in neurocardiology include several major categories:Involvement of the nervous and cardiovascular systems caused by common factors,involvement of the cardiovascular system caused by neuropsychiatric abnormalities,and involvement of the nervous system caused by cardiovascular abnormalities.Routine and special examinations are needed during the diagnostic process.The simultaneous management of brain and heart conditions is the core strategy,which advocates multidisciplinary collaboration,communication,and interaction.Herein,we review studies on the pathophysiological mechanisms,clinical manifestations,and new advances in diagnosis and treatment in the field of neurocardiology,particularly the latest research progress of traditional Chinese medicine,and further propose the construction of an integrated healthcare service system for future research.展开更多
Sn3O4, a common two-dimensional semiconductor photocatalyst, can absorb visible light.However, owing to its rapid recombination of photogenerated electron-hole pairs, its absorption is not sufficient for practical app...Sn3O4, a common two-dimensional semiconductor photocatalyst, can absorb visible light.However, owing to its rapid recombination of photogenerated electron-hole pairs, its absorption is not sufficient for practical application.In this work, a Sn nanoparticle/Sn3O4-x nanosheet heterostructure was prepared by in situ reduction of Sn3O4 under a H2 atmosphere.The Schottky junctions formed between Sn and Sn3O4-x can enhance the photogenerated carrier separation ability.During the hydrogenation process, a portion of the oxygen in the semiconductor can be extracted by hydrogen to form water, resulting in an increase in oxygen vacancies in the semiconductor.The heterostructure showed the ability to remove Rhodamine B.Cell cytocompatibility experiments proved that Sn/Sn3O4-x can significantly enhance cell compatibility and reduce harm to organisms.This work provides a new method for the fabrication of a Schottky junction composite photocatalyst rich in oxygen vacancies with enhanced photocatalytic performance.展开更多
Purpose:.To observe the efficacy of toric design orthokeratology.(ortho-k).for correcting myopia and astigmatism in myopic adolescents with moderate to high astigmatism.Methods:.This was a self-controlled clinical stu...Purpose:.To observe the efficacy of toric design orthokeratology.(ortho-k).for correcting myopia and astigmatism in myopic adolescents with moderate to high astigmatism.Methods:.This was a self-controlled clinical study..Twentyfour subjects(42 eyes).aged 9 to 16 years with myopia of 2.50-6.00 D complicated with rule astigmatism of 1.50-3.50 D were fitted with Lucid Night Toric Ortho-k Lenses(LUCID,KOREA)..The changes in uncorrected visual acuity(UCVA),spherical degree, refraction, axial length(AL),.and corneal status were assessed at baseline, 1 night, 1 week, 1 month, 3months, 6 months, and 1 year after the commencement of ortho-k lens wear.Results: The success rate of the first lens fit was 92.8%. The UCVA after ortho-k wearing was improved significantly compared to the baseline during each visit(all P<0.01), and became stable 1 month after ortho-k. The manifest myopia was significantly reduced from(-3.41±1.27) D to(-0.41±0.37) D by toric ortho-k and the degree of astigmatism from(-1.81±0.53)D to(-0.41±0.39) D after 1 month of lens wear(P<0.01).The mean AL was(24.47 ±0.91) mm at baseline, which did not significantly differ from(24.49 ±0.87) mm and(24.48 ±0.94) mm after 6 months and l year,.respectively,.of lens wear(both P >0.05)..Grade 1 corneal staining was observed at 1week(23.8%),.1 month(21.4%), and 1 year(16.7%) following lens wear, and was improved by lens cleaning,.discontinuing lens wear, and moistening the cornea with eye drops.No severe adverse events were reported.Conclusion: The toric ortho-k lens was effective and safe for correction of low to moderate myopia in children with moderate to high astigmatism..The lens also effectively controlled axial length elongation during 1 year of observation..However,the long-term efficacy remains to be elucidated.展开更多
Mesenchymal stem cells(MSCs)are multi-potent cells that are able to differentiate and mature into various types of cells under a certain microenvironment for cell therapy and tissue regeneration.Scandium(Sc),an import...Mesenchymal stem cells(MSCs)are multi-potent cells that are able to differentiate and mature into various types of cells under a certain microenvironment for cell therapy and tissue regeneration.Scandium(Sc),an important rare earth element,recently has been intensively investigated in biomedical fields as well as industrial engineering,and chloride channels have been proven to be able to affect osteogenic differentiation.Thus,it is significant to investigate effects of ScCl_(3)on cell activities of MSCs.In this paper,rat bone MSCs(rBMSCs)were co-cultured with various concentrations of ScCl_(3)(1×10^(-8),1×10^(-6),and 1×10^(-4)mol/L)to evaluate their influence on cell proliferation as well as osteogenic and adipogenic differentiation in vitro.The results indicate that ScCl_(3)promotes the proliferation of rBMSCs initially,which is yet reduced upon ion accumulation.We used immunofluorescence staining,quantitative real time polymerase chain reactions,and assays measuring alkaline phosphatase activity,mineralized deposits,and intracytoplasmic lipids to reveal that rBMSCs treated with ScCl_(3)at concentrations of 1×10^(-8)-1×10^(-6)mol/L can enhance levels of osteogenic differentiation in a dosedependent manner and reduce adipogenic differentiation to a certain degree through Wnt/β-catenin signaling pathway.These results indicate that appropriate concentrations of ScCl_(3)can improve osteogenic differentiation in the lineage commitment of rBMSCs,and thus,promote bone remodeling.This study implies that ScCl_(3) possesses great potentials in the treatment of bone diseases and would provide new strategy of designing composites by SiCl3 doping for biomedical applications in the future.展开更多
Exploring new strategies to incorporate the concepts of green chemistry and defect engineering into new architectures to address the problem of severe electromagnetic wave(EMW)pollution is challenging.In this work,by ...Exploring new strategies to incorporate the concepts of green chemistry and defect engineering into new architectures to address the problem of severe electromagnetic wave(EMW)pollution is challenging.In this work,by using a by-product of catalytic conversion of biomass as a carbon source,we prepare two-dimensional(2D)Co_(9)S_(8)-coated humins-derived carbon nanomaterials with a yolk-shell structure.The EMW attenuation ability is finally optimized by controlling the morphology and defects of the composite material through the pyrolysis temperature.As expected,with the synergy of conductive loss/interfacial polarization and defects regulating,the composite material achieves a reflection loss(RL)value of−51.4 dB in Ku-band and the effective absorption bandwidth(EAB)can be as high as 5.92 GHz(12.08–18.00 GHz)at 1.8 mm ultra-thin coating thickness.A strong absorption capacity in the low-frequency C-band(6.4 GHz)reaches RL value of−49.9 dB and a thickness of 3.50 mm,which grants it the characteristic of convertible microwave absorption from high frequency to low frequency.Taking account of the facile synthesis and tunable absorption properties,the encouraging findings shed light on exploring waste-turned-microwave absorbents with promising practical applications.展开更多
What is already known about this topic?Suicide behaviors are prevalent among inpatients with schizophrenia.However,the relationships between psychiatric symptoms,sleep disturbances,and suicide risk remain poorly under...What is already known about this topic?Suicide behaviors are prevalent among inpatients with schizophrenia.However,the relationships between psychiatric symptoms,sleep disturbances,and suicide risk remain poorly understood in these high-risk populations.What is added by this report?In a study of 672 schizophrenia inpatients across 9 hospitals in 4 Chinese provinces,the prevalence of suicide risk was 22.3%[95%confidence interval(CI):19.3%,25.6%].The study identified significant associations between suicide risk and multiple clinical factors,including poor sleep quality,depressive symptoms,anxiety symptoms,and other psychiatric manifestations such as thinking disorder and activation.What are the implications for public health practice?Understanding the common sleep-related and psychiatric factors associated with suicide risk in hospitalized schizophrenia patients will enable clinicians and policymakers to better identify clinical risk indicators and enhance the quality of suicide prevention and treatment programs.展开更多
Marine mammals provide a valuable model for studying the molecular basis of convergent evolution during secondary aquatic adaptation.Using multiomics data and functional experiments,including CRISPR-Cas9 mouse models ...Marine mammals provide a valuable model for studying the molecular basis of convergent evolution during secondary aquatic adaptation.Using multiomics data and functional experiments,including CRISPR-Cas9 mouse models and luciferase reporter assays,this study explored the molecular mechanisms driving this transition across coding regions,regulatory elements,and genomic architecture.Convergent amino acid substitutions in APPL1P378L and NEIL1E71G were found to promote lipid accumulation and suppress cancer cell proliferation,likely contributing to the evolution of extensive blubber layers and cancer resistance.Convergently evolved conserved non-exonic elements(CNEs)and lineage-specific regulatory variations were shown to influence the activity of nearby genes(e.g.,NKX3-2,SOX9,HAND2),shaping cetacean limb phenotypes.Additionally,convergent shifts in topologically associating domains(TADs)across cetaceans and pinnipeds were implicated in the regulation of ASXL3 and FAM43B expression,playing a role in the formation of thickened blubber layers and mitigating cancer susceptibility.Structural variations within conserved TADs were associated with the expression of neuronal genes,including NUP153 and ID4,potentially driving cognitive and social adaptations.These findings provide novel insights into the molecular foundations of the convergent evolution of secondary aquatic adaptations in mammals.展开更多
The pioneering exfoliation of monolayer tungsten diselenide has greatly inspired researchers toward semiconducting applications.WSe2 belongs to a family of transition-metal dichalcogenides.Similar to graphene,WSe2 and...The pioneering exfoliation of monolayer tungsten diselenide has greatly inspired researchers toward semiconducting applications.WSe2 belongs to a family of transition-metal dichalcogenides.Similar to graphene,WSe2 and analogous dichalcogenides have layered structures with weak van der Waals interactions between two adjacent layers.First,the readers are presented with the fundamentals of WSe2,such as types,morphologies,and properties.Here,we report the characterization principles and practices such as microscopy,spectroscopy,and diffraction.Second,the methods for obtaining high-quality WSe2,such as exfoliation,hydrothermal and chemical vapor deposition,are briefly listed.With advantages of light weight,flexibility,and high quantum efficiency,2D materials may have a niche in optoelectronics as building blocks in p-n junctions.Therefore,we introduce a state-of-the-art demonstration of heterostructure devices employing the p-type WSe2 semiconductor.The device architectures include field-effect transistors,photodetectors,gas sensors,and photovoltaic solar cells.Due to its unique electronic,optical,and energy band properties,WSe2 has been increasingly investigated due to the conductivity of the p-type charge carrier upon palladium contact.Eventually,the dynamic research on WSe2 and van der Waals heterostructures is summarized to arouse the passion of the 2D research community.展开更多
Due to the short laser wavelength, almost all practical targets are rough. Surface elevations in rough targets will result in layovers in synthetic aperture ladar （SAL）. High resolution SAL image with layovers will ...Due to the short laser wavelength, almost all practical targets are rough. Surface elevations in rough targets will result in layovers in synthetic aperture ladar （SAL）. High resolution SAL image with layovers will be different fi＇om the target picture taken by incoherent tools as digital camera. To investigate the layovers in SAL image, a simplified mathematical model is built by optics diffraction theory and a laboratory SAL is setup using 1550 mn tunable laser source. Layovers in SAL images, in both theoretical simulation and experimental demonstra- tion, are carefully observed. Detailed results on various targets are illustrated.展开更多
As"molecular bridge,"coupling agents can not only realize the covalent connection of composites,but also affect their properties,thus affecting the properties of devices based on them.Herein,leveraging diffe...As"molecular bridge,"coupling agents can not only realize the covalent connection of composites,but also affect their properties,thus affecting the properties of devices based on them.Herein,leveraging differences in charge conduction properties of the(3-aminopropyl)trimethoxysilane and 5,10,15,20-tetrakis(4-aminophenyl)-21H,23H-porphine caused by conjugacy structural differences,two kinds of layerby-layer assembled smart carbon materials with different electrical properties are obtained at the same reduction temperature.The two graphene ultrathin films are then“planted”on Si/SiO2 substrates,respectively,as semiconductor layer and source/drain electrodes to fabricate an ultra-stable all-graphene field effect transistor(AG-FET).Enabled by the covalent functionalized configuration and the functionally diverse of coupling agents,the AG-FET obtained by this simple method won the high electrical characteristics,the hole,electron mobility,and the shelflife could reach 3.79 cm2/(V·s),3.78 cm2/(V·s),and 18months,respectively.In addition,good material stability and excellent device structure endow the device exceptional stability,electrical stability,and solvent resistance,improving its application prospect in solution phase sensing/detection.Such characteristics could be used to sense,transduce,and respond to external stimuli,especially in solution phase to monitor the important analytes,such as Hg^(2+)in a flowing sewage environment.We believe that such easy-to-manufacture AG-FETs with ultrahigh performance and ultrahigh stability could also show great application prospects in other significant fields.展开更多
基金support from the National Natural Science Foundation of China (No. 81374062 and No. 81673579)Hunan Province University Innovation Platform Open Fund (Project 13K077)
文摘The main chemical constituents of the genus Polygonum(Polygonaceae)are flavonoids,quinones,phenylpropanoids,and terpenoids,which show anticancer,antitumor,anti-oxidative,anti-inflammatory,analgesic,antibacterial,insecticidal,and other pharmacological effects.This paper summarizes research on the chemical constituents and pharmacological effects of compounds from the genus Polygonum in last15years.
基金Supported by the Fundamental Research Program of Shanxi Province,No.202403021212275.
文摘Neurocardiology is an interdisciplinary field that studies the interactions between the nervous and cardiovascular systems,encompassing research across the entire spectrum,from molecular mechanisms to clinical diagnosis and treatment.The disease types in neurocardiology include several major categories:Involvement of the nervous and cardiovascular systems caused by common factors,involvement of the cardiovascular system caused by neuropsychiatric abnormalities,and involvement of the nervous system caused by cardiovascular abnormalities.Routine and special examinations are needed during the diagnostic process.The simultaneous management of brain and heart conditions is the core strategy,which advocates multidisciplinary collaboration,communication,and interaction.Herein,we review studies on the pathophysiological mechanisms,clinical manifestations,and new advances in diagnosis and treatment in the field of neurocardiology,particularly the latest research progress of traditional Chinese medicine,and further propose the construction of an integrated healthcare service system for future research.
基金financially supported by the National Natural Science Foundation of China (Nos.51802115 and 51732007)the Natural Science Foundation of Shandong Province, China (No.ZR2019YQ21)。
文摘Sn3O4, a common two-dimensional semiconductor photocatalyst, can absorb visible light.However, owing to its rapid recombination of photogenerated electron-hole pairs, its absorption is not sufficient for practical application.In this work, a Sn nanoparticle/Sn3O4-x nanosheet heterostructure was prepared by in situ reduction of Sn3O4 under a H2 atmosphere.The Schottky junctions formed between Sn and Sn3O4-x can enhance the photogenerated carrier separation ability.During the hydrogenation process, a portion of the oxygen in the semiconductor can be extracted by hydrogen to form water, resulting in an increase in oxygen vacancies in the semiconductor.The heterostructure showed the ability to remove Rhodamine B.Cell cytocompatibility experiments proved that Sn/Sn3O4-x can significantly enhance cell compatibility and reduce harm to organisms.This work provides a new method for the fabrication of a Schottky junction composite photocatalyst rich in oxygen vacancies with enhanced photocatalytic performance.
文摘Purpose:.To observe the efficacy of toric design orthokeratology.(ortho-k).for correcting myopia and astigmatism in myopic adolescents with moderate to high astigmatism.Methods:.This was a self-controlled clinical study..Twentyfour subjects(42 eyes).aged 9 to 16 years with myopia of 2.50-6.00 D complicated with rule astigmatism of 1.50-3.50 D were fitted with Lucid Night Toric Ortho-k Lenses(LUCID,KOREA)..The changes in uncorrected visual acuity(UCVA),spherical degree, refraction, axial length(AL),.and corneal status were assessed at baseline, 1 night, 1 week, 1 month, 3months, 6 months, and 1 year after the commencement of ortho-k lens wear.Results: The success rate of the first lens fit was 92.8%. The UCVA after ortho-k wearing was improved significantly compared to the baseline during each visit(all P<0.01), and became stable 1 month after ortho-k. The manifest myopia was significantly reduced from(-3.41±1.27) D to(-0.41±0.37) D by toric ortho-k and the degree of astigmatism from(-1.81±0.53)D to(-0.41±0.39) D after 1 month of lens wear(P<0.01).The mean AL was(24.47 ±0.91) mm at baseline, which did not significantly differ from(24.49 ±0.87) mm and(24.48 ±0.94) mm after 6 months and l year,.respectively,.of lens wear(both P >0.05)..Grade 1 corneal staining was observed at 1week(23.8%),.1 month(21.4%), and 1 year(16.7%) following lens wear, and was improved by lens cleaning,.discontinuing lens wear, and moistening the cornea with eye drops.No severe adverse events were reported.Conclusion: The toric ortho-k lens was effective and safe for correction of low to moderate myopia in children with moderate to high astigmatism..The lens also effectively controlled axial length elongation during 1 year of observation..However,the long-term efficacy remains to be elucidated.
基金Project supported by the National Natural Science Foundation of China(51972148,51802115,11904131,21501090)the Project of"20 items of University"of Jinan(2018GXRC031)the Doctoral Fund of University of Jinan(XBS1609)。
文摘Mesenchymal stem cells(MSCs)are multi-potent cells that are able to differentiate and mature into various types of cells under a certain microenvironment for cell therapy and tissue regeneration.Scandium(Sc),an important rare earth element,recently has been intensively investigated in biomedical fields as well as industrial engineering,and chloride channels have been proven to be able to affect osteogenic differentiation.Thus,it is significant to investigate effects of ScCl_(3)on cell activities of MSCs.In this paper,rat bone MSCs(rBMSCs)were co-cultured with various concentrations of ScCl_(3)(1×10^(-8),1×10^(-6),and 1×10^(-4)mol/L)to evaluate their influence on cell proliferation as well as osteogenic and adipogenic differentiation in vitro.The results indicate that ScCl_(3)promotes the proliferation of rBMSCs initially,which is yet reduced upon ion accumulation.We used immunofluorescence staining,quantitative real time polymerase chain reactions,and assays measuring alkaline phosphatase activity,mineralized deposits,and intracytoplasmic lipids to reveal that rBMSCs treated with ScCl_(3)at concentrations of 1×10^(-8)-1×10^(-6)mol/L can enhance levels of osteogenic differentiation in a dosedependent manner and reduce adipogenic differentiation to a certain degree through Wnt/β-catenin signaling pathway.These results indicate that appropriate concentrations of ScCl_(3)can improve osteogenic differentiation in the lineage commitment of rBMSCs,and thus,promote bone remodeling.This study implies that ScCl_(3) possesses great potentials in the treatment of bone diseases and would provide new strategy of designing composites by SiCl3 doping for biomedical applications in the future.
基金financially supported by the Jilin Province Science and Technology Development Plan(No.20210509035RQ).
文摘Exploring new strategies to incorporate the concepts of green chemistry and defect engineering into new architectures to address the problem of severe electromagnetic wave(EMW)pollution is challenging.In this work,by using a by-product of catalytic conversion of biomass as a carbon source,we prepare two-dimensional(2D)Co_(9)S_(8)-coated humins-derived carbon nanomaterials with a yolk-shell structure.The EMW attenuation ability is finally optimized by controlling the morphology and defects of the composite material through the pyrolysis temperature.As expected,with the synergy of conductive loss/interfacial polarization and defects regulating,the composite material achieves a reflection loss(RL)value of−51.4 dB in Ku-band and the effective absorption bandwidth(EAB)can be as high as 5.92 GHz(12.08–18.00 GHz)at 1.8 mm ultra-thin coating thickness.A strong absorption capacity in the low-frequency C-band(6.4 GHz)reaches RL value of−49.9 dB and a thickness of 3.50 mm,which grants it the characteristic of convertible microwave absorption from high frequency to low frequency.Taking account of the facile synthesis and tunable absorption properties,the encouraging findings shed light on exploring waste-turned-microwave absorbents with promising practical applications.
基金Supported by the Ministry of Science and Technology of the People’s Republic of China(STI2030-Major Projects2021ZD0201900)the National Natural Science Foundation of China(81971235).
文摘What is already known about this topic?Suicide behaviors are prevalent among inpatients with schizophrenia.However,the relationships between psychiatric symptoms,sleep disturbances,and suicide risk remain poorly understood in these high-risk populations.What is added by this report?In a study of 672 schizophrenia inpatients across 9 hospitals in 4 Chinese provinces,the prevalence of suicide risk was 22.3%[95%confidence interval(CI):19.3%,25.6%].The study identified significant associations between suicide risk and multiple clinical factors,including poor sleep quality,depressive symptoms,anxiety symptoms,and other psychiatric manifestations such as thinking disorder and activation.What are the implications for public health practice?Understanding the common sleep-related and psychiatric factors associated with suicide risk in hospitalized schizophrenia patients will enable clinicians and policymakers to better identify clinical risk indicators and enhance the quality of suicide prevention and treatment programs.
基金supported by the National Key Programme of Research and Development,Ministry of Science and Technology(2022YFF1301600)to G.Y.the Key Project of the Na tional Natural Science Foundation of China(32030011)to G.Y.+5 种基金the National Natural Science Foundation of China(32070409,32270453,32270442,32070408,and 32270441)to S.X.,W.R.,L.S.,and R.T.the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD),Qinglan Project of Jiangsu Province to S.X.the Specially-Appointed Professor Program of Jiangsu Province to I.S.the Jiangsu Foreign Expert Bureau to I.S.the Jiangsu Provincial Department of Technology(JSSCTD202142)to I.S.the PI Project of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(GML2021GD0805)to G.Y.
文摘Marine mammals provide a valuable model for studying the molecular basis of convergent evolution during secondary aquatic adaptation.Using multiomics data and functional experiments,including CRISPR-Cas9 mouse models and luciferase reporter assays,this study explored the molecular mechanisms driving this transition across coding regions,regulatory elements,and genomic architecture.Convergent amino acid substitutions in APPL1P378L and NEIL1E71G were found to promote lipid accumulation and suppress cancer cell proliferation,likely contributing to the evolution of extensive blubber layers and cancer resistance.Convergently evolved conserved non-exonic elements(CNEs)and lineage-specific regulatory variations were shown to influence the activity of nearby genes(e.g.,NKX3-2,SOX9,HAND2),shaping cetacean limb phenotypes.Additionally,convergent shifts in topologically associating domains(TADs)across cetaceans and pinnipeds were implicated in the regulation of ASXL3 and FAM43B expression,playing a role in the formation of thickened blubber layers and mitigating cancer susceptibility.Structural variations within conserved TADs were associated with the expression of neuronal genes,including NUP153 and ID4,potentially driving cognitive and social adaptations.These findings provide novel insights into the molecular foundations of the convergent evolution of secondary aquatic adaptations in mammals.
基金The Major Innovation Projects in Shandong Province,Grant/Award Number:2018YFJH0503National Key Research and Development Program of China,Grant/Award Number:2017YFB0405400+2 种基金National Natural Science Foundation of China,Grant/Award Numbers:51802113,51802116,51902131Natural Science Foundation of Shandong Province,Grant/Award Numbers:ZR2018BEM015,ZR2019BEM006,ZR2019BEM040Taishan Scholars Project Special Funds,Grant/Award Number:tsqn201812083。
文摘The pioneering exfoliation of monolayer tungsten diselenide has greatly inspired researchers toward semiconducting applications.WSe2 belongs to a family of transition-metal dichalcogenides.Similar to graphene,WSe2 and analogous dichalcogenides have layered structures with weak van der Waals interactions between two adjacent layers.First,the readers are presented with the fundamentals of WSe2,such as types,morphologies,and properties.Here,we report the characterization principles and practices such as microscopy,spectroscopy,and diffraction.Second,the methods for obtaining high-quality WSe2,such as exfoliation,hydrothermal and chemical vapor deposition,are briefly listed.With advantages of light weight,flexibility,and high quantum efficiency,2D materials may have a niche in optoelectronics as building blocks in p-n junctions.Therefore,we introduce a state-of-the-art demonstration of heterostructure devices employing the p-type WSe2 semiconductor.The device architectures include field-effect transistors,photodetectors,gas sensors,and photovoltaic solar cells.Due to its unique electronic,optical,and energy band properties,WSe2 has been increasingly investigated due to the conductivity of the p-type charge carrier upon palladium contact.Eventually,the dynamic research on WSe2 and van der Waals heterostructures is summarized to arouse the passion of the 2D research community.
文摘Due to the short laser wavelength, almost all practical targets are rough. Surface elevations in rough targets will result in layovers in synthetic aperture ladar （SAL）. High resolution SAL image with layovers will be different fi＇om the target picture taken by incoherent tools as digital camera. To investigate the layovers in SAL image, a simplified mathematical model is built by optics diffraction theory and a laboratory SAL is setup using 1550 mn tunable laser source. Layovers in SAL images, in both theoretical simulation and experimental demonstra- tion, are carefully observed. Detailed results on various targets are illustrated.
基金supported by the National Natural Science Foundation of China(Grant No.51902131)Natural Science Foundation of Shandong province(Grant No.ZR2019BEM006)+1 种基金National Key Research and Development Program of China(Grant No.2017YFB0405400)Major Innovation Projects in Shandong Province(2018YFJH0503).
文摘As"molecular bridge,"coupling agents can not only realize the covalent connection of composites,but also affect their properties,thus affecting the properties of devices based on them.Herein,leveraging differences in charge conduction properties of the(3-aminopropyl)trimethoxysilane and 5,10,15,20-tetrakis(4-aminophenyl)-21H,23H-porphine caused by conjugacy structural differences,two kinds of layerby-layer assembled smart carbon materials with different electrical properties are obtained at the same reduction temperature.The two graphene ultrathin films are then“planted”on Si/SiO2 substrates,respectively,as semiconductor layer and source/drain electrodes to fabricate an ultra-stable all-graphene field effect transistor(AG-FET).Enabled by the covalent functionalized configuration and the functionally diverse of coupling agents,the AG-FET obtained by this simple method won the high electrical characteristics,the hole,electron mobility,and the shelflife could reach 3.79 cm2/(V·s),3.78 cm2/(V·s),and 18months,respectively.In addition,good material stability and excellent device structure endow the device exceptional stability,electrical stability,and solvent resistance,improving its application prospect in solution phase sensing/detection.Such characteristics could be used to sense,transduce,and respond to external stimuli,especially in solution phase to monitor the important analytes,such as Hg^(2+)in a flowing sewage environment.We believe that such easy-to-manufacture AG-FETs with ultrahigh performance and ultrahigh stability could also show great application prospects in other significant fields.
