Thermoelectric generators have attracted a wide research interest owing to their ability to directly convert heat into electrical power.Moreover,the thermoelectric properties of traditional inorganic and organic mater...Thermoelectric generators have attracted a wide research interest owing to their ability to directly convert heat into electrical power.Moreover,the thermoelectric properties of traditional inorganic and organic materials have been significantly improved over the past few decades.Among these compounds,layered two-dimensional(2D)materials,such as graphene,black phosphorus,transition metal dichalcogenides,IVA–VIA compounds,and MXenes,have generated a large research attention as a group of potentially high-performance thermoelectric materials.Due to their unique electronic,mechanical,thermal,and optoelectronic properties,thermoelectric devices based on such materials can be applied in a variety of applications.Herein,a comprehensive review on the development of 2D materials for thermoelectric applications,as well as theoretical simulations and experimental preparation,is presented.In addition,nanodevice and new applications of 2D thermoelectric materials are also introduced.At last,current challenges are discussed and several prospects in this field are proposed.展开更多
A kind of sandwich-like NiCo_2O_4/rGO/NiO heterostructure composite has been successfully anchored on nickel foam substrate via a three-step hydrothermal method with successive annealing treatment. The smart combinati...A kind of sandwich-like NiCo_2O_4/rGO/NiO heterostructure composite has been successfully anchored on nickel foam substrate via a three-step hydrothermal method with successive annealing treatment. The smart combination of NiCo_2O_4, reduced graphene oxide(rGO), and NiO nanostructure in the sandwich-like nano architecture shows a promising synergistic effect for supercapacitors with greatly enhanced electrochemical performance. For serving as supercapacitor electrode, the NiCo_2O_4/rGO/NiO heterostructure materials exhibit remarkable specific capacitance of 2644 mF cm^(-2)at current density of 1 mA cm^(-2),and excellent capacitance retentions of 97.5% after 3000 cycles. It is expected that the present heterostructure will be a promising electrode material for high-performance supercapacitors.展开更多
In recent years,emerging two-dimensional(2D)platinum diselenide(PtSe2)has quickly attracted the attention of the research community due to its novel physical and chemical properties.For the past few years,increasing r...In recent years,emerging two-dimensional(2D)platinum diselenide(PtSe2)has quickly attracted the attention of the research community due to its novel physical and chemical properties.For the past few years,increasing research achievements on 2D PtSe2 have been reported toward the fundamental science and various potential applications of PtSe2.In this review,the properties and structure characteristics of 2D PtSe2 are discussed at first.Then,the recent advances in synthesis of PtSe2 as well as their applications are reviewed.At last,potential perspectives in exploring the application of 2D PtSe2 are reviewed.展开更多
All-optical devices without external electronic components have drawn extraordinary attentions in all-optical communication.In this work,boron quantum dots(BQDs)were synthesized by a facile liquid-phase exfoliation me...All-optical devices without external electronic components have drawn extraordinary attentions in all-optical communication.In this work,boron quantum dots(BQDs)were synthesized by a facile liquid-phase exfoliation method.The as-prepared BQDs showed good structural homogeneity and crystallinity,broadband optical absorption as well as excellent photothermal properties.Femtosecond-resolved transient absorption further revealed the short carrier relaxation time of BQDs.Inspired by the outstanding photothermal properties and ultrafast carrier dynamic of BQDs,we fabricated BQDsbased all-optical modulator.The phase shift with a slope efficiency of 0.032π/m W and response time of 0.97 ms can be achieved.The modulator was used in laser resonance cavity to achieve all-optical actively Q-switched laser operation with control repetition rate.This prototypical BQDs-based all-optical modulator shows a great potential to be applied in all-optical information processing and communication.展开更多
Dual-band photodetectors exhibit considerable advantages in target discrimination and navigation compared to single-band devices in complex circumstances.However,it remains a major challenge to overcome the limitation...Dual-band photodetectors exhibit considerable advantages in target discrimination and navigation compared to single-band devices in complex circumstances.However,it remains a major challenge to overcome the limitations of traditional devices in terms of their integration with multiple light-absorbing layers and complicated optical components.In this study,a visible and nearinfrared(NIR)dual-band polarimetric photodetector with a single lightabsorbing layer is constructed by utilizing the distinctive conversion of linear dichroism(LD)polarity in two-dimensional niobium trisulfide(NbS_(3)).The NbS_(3)photodetector exhibits selective detection behaviors in the visible and NIR bands,in which by switching the polarization angle of the incident light from 0°to 90°,photocurrent decreases in the visible region,and increases in the NIR region.Specifically,the degrees of linear polarization of photocurrent are 0.59 at 450 nm and-0.47 at 1300 nm,respectively.The opposite photoresponse in the visible and NIR bands of the photodetector significantly enhances the dual-band information recognition.Therefore,clear visible and NIR dual-band polarimetric imaging is accurately realized based on the NbS_(3)photodetector taking advantage of its fast response speed of 28μs.Such anisotropic materials,with unique LD conversion features,can facilitate selective modulation between the visible and NIR spectral ranges and promote the development of next-generation multi-dimensional photodetection for various applications,including com/puter vision,surveillance,and biomedical imaging.展开更多
基金supported by National Science Foundation for Young Scientists of China (No.61905161 and 51702219)the National Natural Science Foundation of China (No.61975134,61875138 and 61775147)+1 种基金the Science and Technology Innovation Commission of Shenzhen (No. JCYJ20180206121837007)the Shenzhen Nanshan District Pilotage Team Program (LHTD20170006)
文摘Thermoelectric generators have attracted a wide research interest owing to their ability to directly convert heat into electrical power.Moreover,the thermoelectric properties of traditional inorganic and organic materials have been significantly improved over the past few decades.Among these compounds,layered two-dimensional(2D)materials,such as graphene,black phosphorus,transition metal dichalcogenides,IVA–VIA compounds,and MXenes,have generated a large research attention as a group of potentially high-performance thermoelectric materials.Due to their unique electronic,mechanical,thermal,and optoelectronic properties,thermoelectric devices based on such materials can be applied in a variety of applications.Herein,a comprehensive review on the development of 2D materials for thermoelectric applications,as well as theoretical simulations and experimental preparation,is presented.In addition,nanodevice and new applications of 2D thermoelectric materials are also introduced.At last,current challenges are discussed and several prospects in this field are proposed.
基金supported by the Special Fund for the Development of Strategic Emerging Industries of Shenzhen City of China(No.JCYJ20140419141154246)the National Nature Science Foundation of China(No.11174227)Chinese Universities Scientific Fund
文摘A kind of sandwich-like NiCo_2O_4/rGO/NiO heterostructure composite has been successfully anchored on nickel foam substrate via a three-step hydrothermal method with successive annealing treatment. The smart combination of NiCo_2O_4, reduced graphene oxide(rGO), and NiO nanostructure in the sandwich-like nano architecture shows a promising synergistic effect for supercapacitors with greatly enhanced electrochemical performance. For serving as supercapacitor electrode, the NiCo_2O_4/rGO/NiO heterostructure materials exhibit remarkable specific capacitance of 2644 mF cm^(-2)at current density of 1 mA cm^(-2),and excellent capacitance retentions of 97.5% after 3000 cycles. It is expected that the present heterostructure will be a promising electrode material for high-performance supercapacitors.
基金This work is supported by the Science and Technology Innovation Commission of Shenzhen(JCYJ20190808142415003)National Natural Science Foundation of China(Grant Nos.61905161,61875138,and 61961136001)the Shenzhen Nanshan District Pilotage Team Program(LHTD20170006).
文摘In recent years,emerging two-dimensional(2D)platinum diselenide(PtSe2)has quickly attracted the attention of the research community due to its novel physical and chemical properties.For the past few years,increasing research achievements on 2D PtSe2 have been reported toward the fundamental science and various potential applications of PtSe2.In this review,the properties and structure characteristics of 2D PtSe2 are discussed at first.Then,the recent advances in synthesis of PtSe2 as well as their applications are reviewed.At last,potential perspectives in exploring the application of 2D PtSe2 are reviewed.
基金financial supports from the State Key Research Development Program of China(Grant No.2019YFB2203503)National Natural Science Fund(Grant No.61875138)the support from the Instrumental Analysis Center of Shenzhen University(Xili Campus)。
文摘All-optical devices without external electronic components have drawn extraordinary attentions in all-optical communication.In this work,boron quantum dots(BQDs)were synthesized by a facile liquid-phase exfoliation method.The as-prepared BQDs showed good structural homogeneity and crystallinity,broadband optical absorption as well as excellent photothermal properties.Femtosecond-resolved transient absorption further revealed the short carrier relaxation time of BQDs.Inspired by the outstanding photothermal properties and ultrafast carrier dynamic of BQDs,we fabricated BQDsbased all-optical modulator.The phase shift with a slope efficiency of 0.032π/m W and response time of 0.97 ms can be achieved.The modulator was used in laser resonance cavity to achieve all-optical actively Q-switched laser operation with control repetition rate.This prototypical BQDs-based all-optical modulator shows a great potential to be applied in all-optical information processing and communication.
基金supported by the National Natural Science Foundation of China(NSFC)-Research Grant Council of Hong Kong(RGC)Key International(Regional)Joint Research Program(NSFC Grant No.62261160574)NSFC Grant No.51872337+2 种基金the Guangdong Basic and Applied Basic Research Foundation(Grant Nos.2024A1515010295,2022A1515110707,and 2021A1515012592)the China Postdoctoral Science Foundation(CPSF)(Grant Nos.2024M752105 and 2024T170580)Postdoctoral Fellowship Program of CPSF(GZB20230450).
文摘Dual-band photodetectors exhibit considerable advantages in target discrimination and navigation compared to single-band devices in complex circumstances.However,it remains a major challenge to overcome the limitations of traditional devices in terms of their integration with multiple light-absorbing layers and complicated optical components.In this study,a visible and nearinfrared(NIR)dual-band polarimetric photodetector with a single lightabsorbing layer is constructed by utilizing the distinctive conversion of linear dichroism(LD)polarity in two-dimensional niobium trisulfide(NbS_(3)).The NbS_(3)photodetector exhibits selective detection behaviors in the visible and NIR bands,in which by switching the polarization angle of the incident light from 0°to 90°,photocurrent decreases in the visible region,and increases in the NIR region.Specifically,the degrees of linear polarization of photocurrent are 0.59 at 450 nm and-0.47 at 1300 nm,respectively.The opposite photoresponse in the visible and NIR bands of the photodetector significantly enhances the dual-band information recognition.Therefore,clear visible and NIR dual-band polarimetric imaging is accurately realized based on the NbS_(3)photodetector taking advantage of its fast response speed of 28μs.Such anisotropic materials,with unique LD conversion features,can facilitate selective modulation between the visible and NIR spectral ranges and promote the development of next-generation multi-dimensional photodetection for various applications,including com/puter vision,surveillance,and biomedical imaging.
