检索结果-南通市图书馆

High-performance self-powered ultraviolet photodetector in SnO_(2)microwire/p-GaN heterojunction using graphene as charge collection medium

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第7期138卷 183-192页

作者： Tong Xu Mingming Jiang Peng Wan Yang Liu Caixia Kan daning shi College of physics MIIT Key Laboratory of Aerospace Information Materials and PhysicsKey Laboratory for Intelligent Nano Materials and DevicesNanjing University of Aeronautics and AstronauticsNanjing 211106China

Graphene monolayer has been extensively applied as a transparency electrode material in photoelectronic devices due to its high transmittance,high carrier mobility,and ultrafast carrier *** this study,a high-performance self-powered photodetector,which is made of a SnO_(2)microwire,p-type GaN film,and monolayer graphene transparent electrode,was proposed and *** detector is sensitive to ultraviolet light signals and illustrates pronounced detection performances,including a peak respon-sivity∼223.7 mA W^(-1),a detectivity∼6.9×10^(12)Jones,fast response speed(rising/decaying times∼18/580μs),and excellent external quantum efficiency∼77%at 360 nm light illumination without exter-nal power *** with the pristine SnO_(2)/GaN photodetector using ITO electrode,the device performances of responsivity and detectivity are significantly increased over 6×10^(3)%and 3×10^(3)%,*** performance-enhanced characteristics are mainly attributed to the high-quality het-erointerface of n-SnO_(2)/p-GaN,the highly conductive capacity,and the unique transparency of graphene ***,the built-in potential formed at the SnO_(2)/GaN heterojunction interface could be strengthened by the Schottky potential barrier derived from the graphene electrode and SnO_(2)wire,en-hancing the carrier collection efficiency through graphene as a charge collection *** work is of great importance and significance to developing excellent-performance ultraviolet photodetectors for photovoltaic and optoelectronic applications in a self-powered operation manner.

关键词： Self-powered photodetector SnO_(2)microwires Monolayer graphene electrode Heterojunction Schottky barrier

Effective fabrication of porous Au-Ag alloy nanorods for in situ Raman monitoring catalytic oxidation and reduction reactions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第32期91卷 262-269页

作者： Shanlin Ke Caixia Kan Xingzhong Zhu Changshun Wang Weijian Gao Zhaosheng Li Xiaoguang Zhu daning shi College of Science Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Aerospace Information Materials and Physics Ministry of Industry and Information TechnologyNanjing 210016China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China Institute of Solid State Physics Chinese Academy of SciencesHefei 230031China Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education Nanjing 210016China

Porous metal nanostructures exhibit excellent catalytic properties due to their high surface-to-volume ratios and abundant catalytic active sites. However, it is still challenging to control nanopores density and structural features in a facile route and the preparation of porous alloy nanorods for catalytic application has not been well explored. In this work, we demonstrate a synthetic strategy to fabricate highly porous Au–Ag alloy nanorods(P-Au Ag NRs) by critically dealloying Ag atoms from homogeneous solid Au–Ag alloy nanorods(Au Ag NRs). Combining the merits of the tunable plasmonic properties of noble metal nanorods, excellent stabilities of alloys, and superior catalytic activities of porous structures, we use the P-Au Ag NRs as a Raman probe for the in situ monitoring of the catalytic oxidation of 3,3',5,5' tetramethylbenzidine(TMB) and reduction of 4-nitrothiophenol(4-NTP). We also compare their compositiondependent catalytic activities. The results show that P-Au Ag NRs possess superior chemical stability and higher catalytic activity than those of core-shell structures due to synergistic structural and chemical mechanisms. This strategy provides a predictive design approach for the next-generation alloy catalysts with high-performance.

关键词： Catalysis Porous Au-Ag alloy nanorod High-index facets Raman monitoring Oxidation and reduction

Synthesis of high-purity silver nanorods with tunable plasmonic properties and sensor behavior

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2017年第1期5卷 27-32页

作者： Haiying Xu Caixia Kan Changzong Miao Changshun Wang Jingjing Wei Yuan Ni Beibei Lu daning shi College of Science Nanjing University of Aeronautics and Astronautics Department of Mathematics and Physics Nanjing Institute of Technology

Through anisotropic Ag overgrowth on the surface of Au nanobipyramids(Au NBPs), high-purity and sizecontrolled Ag nanorods(Au/Ag NRs) are obtained by a simplified purification process. The diameters of the Au/Ag NRs are determined by the size of the as-prepared Au NBPs, and the lengths of the Au/Ag NRs are tunable using different amounts of Ag precursor in the growth solution. Surface-enhanced Raman scattering(SERS) studies using Rhodamine-6G(R6G) as a test molecule indicate that the Au/Ag NRs have excellent sensing potential. The tunable optical properties and strong electromagnetic effect of the Au/Ag NRs, along with their superior SERS signal enhancement, show that Au/Ag NRs are promising for further applications in plasmon sensing and biomolecular detection.

关键词： NBP Ag Synthesis of high-purity silver nanorods with tunable plasmonic properties and sensor behavior high

Alloyed Au-Ag nanorods with desired plasmonic properties and stability in harsh environments

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2019年第5期7卷 558-565页

作者： Yuan Ni Caixia Kan Longbing He Xingzhong Zhu Mingming Jiang daning shi College of Science Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education Nanjing 210016 China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of the Ministry of Education Southeast University Nanjing 210096 China Southeast University-Monash University Joint Research Institute Suzhou 215123 China

Bio-chemical molecular detection in the nanoscale, based on alloyed nanorods(NRs) with tunable surface plasmon resonance(SPR) properties and high chemical stability, has attracted particular interest. In this work,alloyed Au-Ag NRs with tunable aspect ratios were achieved by annealing Au nanobipyramid-directed Au@Ag core-shell NRs. The core-shell NRs were encapsulated within mesoporous silica outer shells to avoid fusion or aggregation. The structural stability of fully alloyed Au-Ag NRs, including chemical and thermal stability, is remarkably improved compared with that of Au@Ag core-shell NRs. The alloyed NRs would maintain the rod-like structure after being incubated in etchant solution, while Au@Ag core-shell NRs would decay into ***, fully alloyed NRs present stable morphology under annealing at high temperatures of up to 600℃ in air. Benefiting from excellent structural and chemical stabilities, the surface-enhanced Raman scattering effect based on alloyed NRs is stable in harsh environments. Taking advantage of tunable SPR properties(600–1800 nm) and excellent stability, the obtained nanostructures can serve as drug carriers. The perfect photo-thermal effect induced by the particular SPR of alloyed NRs can improve the release efficiency of drugs.

关键词： plasmonic properties stability harsh environments

Bifunctional ultraviolet light-emitting/detecting device based on a SnO_(2) microwire/p-GaN heterojunction

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2021年第12期9卷 2475-2485页

作者： TONG XU MINGMING JIANG PENG WAN KAI TANG daning shi CAIXIA KAN College of Science MIIT Key Laboratory of Aerospace Information Materials and PhysicsKey Laboratory for Intelligent Nano Materials and DevicesNanjing University of Aeronautics and AstronauticsNanjing 211106China

SnO_(2)has attracted considerable attention due to its wide bandgap,large exciton binding energy,and outstanding electrical and optoelectronic *** to the lack of reliable and reproducible p-type SnO_(2),many challenges on developing SnO_(2)-based optoelectronic devices and their practical applications still ***,single-crystal SnO_(2)microwires(MWs)are acquired via the self-catalyzed *** a strategic alternative,n-SnO_(2)MW/p-GaN heterojunction was constructed,which exhibited selectable dual-functionalities of light-emitting and photodetection when operated by applying an appropriate *** device illustrated a distinct near-ultraviolet light-emission peaking at∼395.0 nm and a linewidth∼50 ***,the device characteristics,in terms of the main peak positions and linewidth,are nearly invariant as functions of various injection current,suggesting that quantum-confined Stark effect is essentially ***,the identical n-SnO_(2)MW/p-GaN heterojunction can also achieve photovoltaic-type light *** device can steadily feature ultraviolet photodetecting ability,including the ultraviolet/visible rejection ratio(R_(360 nm)/R_(400 nm))∼1.5×10^(3),high photodark current ratio of 105,fast response speed of 9.2/51 ms,maximum responsivity of 1.5 A/W,and detectivity of 1.3×10^(13)Jones under 360 nm light at−3 V ***,the bifunctional device not only displays distinct near-ultraviolet light emission,but also has the ability of high-sensitive ultraviolet *** novel design of n-SnO_(2)MW/p-GaN heterojunction bifunctional systems is expected to open doors to practical application of SnO_(2)microstructures/nanostructures for large-scale device miniaturization,integration and multifunction in next-generation high-performance photoelectronic devices.

关键词： heterojunction optoelectronic ultraviolet

High-performance,low-power,and flexible ultraviolet photodetector based on crossed ZnO microwires p-n homojunction

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2024年第4期12卷 648-662页

作者： SHULIN SHA KAI TANG MAOSHENG LIU PENG WAN CHENYANG ZHU daning shi CAIXIA KAN MINGMING JIANG College of Physics MIIT Key Laboratory of Aerospace Information Materials and PhysicsKey Laboratory for Intelligent Nano Materials and DevicesNanjing University of Aeronautics and AstronauticsNanjing 211106China

Low-power, flexible, and integrated photodetectors have attracted increasing attention due to their potential applications of photosensing, astronomy, communications, wearable electronics, etc. Herein, the samples of ZnO microwires having p-type(Sb-doped ZnO, ZnO:Sb) and n-type(Ga-doped ZnO, ZnO:Ga) conduction properties were synthesized individually. Sequentially, a p-n homojunction vertical structure photodiode involving a single ZnO:Sb microwire crossed with a ZnO:Ga microwire, which can detect ultraviolet light signals, was constructed.

关键词： power ultraviolet conduction

Cold Welding of Au Nanostructures at Room Temperature

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2021年第3期38卷 492-500页

作者： XU Haiying NI Yuan MIAO Changzong KAN Caixia shi daning College of Science Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China Department of Mathematics and Physics Nanjing Institute of TechnologyNanjing 211167P.R.China Department of Mathematics and Physics Jinling Institute of TechnologyNanjing 211169P.R.China

The common Au nanostructures(nanospheres,nanorods and nanosheets)were prepared by the seed growth method to explore the cold welding phenomenon of these non-single crystal nanostructures at room *** studies show that the concentration of surfactant cetyltrimethylammonium bromide(CTAB)and drying conditions are important factors to determine the evolution and final configuration of nanostructures during *** key factor of cold welding is the concentration of surfactant as low as 0.3 mm/L,and the welding should be carried out under the condition of slow evaporation and sufficient relaxation time,rather than rapid drying *** the same time,the structural evolution during the welding process of gold rod head and tail is simulated by combining the electronic microscope characterization and density functional theory,which reveals that the stability of the welding nanostructure is better than that of the dispersed *** the slow evaporation process of Au nanostructures with the same crystal structure,the low surfactant attached to the surface of the nanoparticles increases the attraction between the nanoparticles,which makes the nanoparticles close to each other adhere due to the interaction,and improves the physical properties of the intersection due to the diffusion,epitaxy and surface relaxation of the metal surface *** results provide a research basis for the physical property analysis of nanostructures and the construction of defect devices.

关键词： cold welding Au nanostructures oriented-attachment room temperature density function theory

ELASTIC AND PLASTIC DEFORMATIONS OF NICKEL NANOWIRES UNDER UNIAXIAL COMPRESSION

在线全文

学校读者我要写书评

暂无评论

ELASTIC AND PLASTIC DEFORMATIONS OF NICKEL NANOWIRES UNDER U...

中国力学学会学术大会'2005

作者： shi daning Wang Baolin (Department of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China )

For the future technological applications of the one-dimensional (1-D) metal nanowires with the novel structures, a comprehensive understanding of deformation mechanisms under external mechanical loadings is necessary. It is also important to systematically investigate the mechanical properties of 1-D nanostructures made of various materials with different interatomic bonding. These investigations may shed light on the optimal design of nanomechanical devices using nanowires as building blocks. So far, our theoretical knowledge on the

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

政府服务企业方式变革与创新研究

行政管理改革 2021年第2期 28-34页

作者：黄恒学史大宁冯向阳北京大学政府管理学院北京大学国家治理研究院中国传媒大学国家治理研究院深圳市福田区政府企业发展服务中心

正确处理政府与企业之间的关系,是进一步推动放管服改革和优化营商环境的关键所在。在市场经济条件下,企业是市场的主体,也是政府监管和服务的对象。完善和创新政府服务企业的形式与内容,是建设服务型政府的一项重要目标与任务。本文运... 详细信息

正确处理政府与企业之间的关系,是进一步推动放管服改革和优化营商环境的关键所在。在市场经济条件下,企业是市场的主体,也是政府监管和服务的对象。完善和创新政府服务企业的形式与内容,是建设服务型政府的一项重要目标与任务。本文运用公共管理和公共经济的基本理论与方法,系统研究和总结新时期深圳市政府服务企业的基本经验和主要特征,从理论上探索新时期中国政府服务企业方式变革与模式创新的新思路。

关键词：服务型政府政府服务企业政企关系营商环境政府管理创新