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界面工程与等离激元效应协同作用增强的ZnO微米线同质结自驱动紫外探测器

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Science China Materials 2024年第3期67卷 842-851页

作者：唐楷沙树林万鹏翟亚林阚彩侠施大宁姜明明 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

高灵敏度的自驱动紫外探测器在许多应用中都大有可为.本研究提出了一种一维ZnO基同结光电探测器,它包括表面覆盖着Ag纳米线的锑掺杂ZnO微米线(AgNWs@ZnO:Sb MW)、MgO缓冲纳米层和ZnO薄膜.该探测器在0 V偏压下对紫外光非常敏感,其性能参... 详细信息

高灵敏度的自驱动紫外探测器在许多应用中都大有可为.本研究提出了一种一维ZnO基同结光电探测器,它包括表面覆盖着Ag纳米线的锑掺杂ZnO微米线(AgNWs@ZnO:Sb MW)、MgO缓冲纳米层和ZnO薄膜.该探测器在0 V偏压下对紫外光非常敏感,其性能参数包括约7个量级的开关比、292.2 mA W^(-1)的响应度、6.9×10^(13)Jones的比探测率,以及微秒量级的快速响应速度(上升时间16.4μs,下降时间465.1μs).特别是10μW cm^(-2)的微弱紫外光时接近99.3%的外量子效率.此外,本文系统研究了MgO纳米薄膜和表面修饰AgNWs对探测器件性能增强的机理.作为自驱动光接收器,该光电二极管被进一步集成到能够实时传输信息的紫外通信系统中.此外,基于AgNWs@p-ZnO:Sb MW/i-MgO/n-ZnO的同质结9×9阵列显示出均匀的光响应分布,可用作具有良好空间分辨率的成像传感器.这项研究有望为设计高性能紫外光检测器提供一条具有低功耗和可大规模建造的途径.

关键词： interface engineering p-type ZnO:Sb microwire selfpowered photodetector imaging sensor UV optical communication plasmonic effect

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

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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

Structural and Piezoelectric Properties of Sr_(0.6)Ba_(0.4)Nb_2O_6 Micro-rods Synthesized by Molten-Salt Method

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第3期35卷 432-436页

作者： Zhang Guangbin Hu Chengchao shi Yangguang shi daning Department of Applied Physics Nanjing University of Aeronautics and Astronautics College of Materials Science and Engineering Liaocheng University

Sr0.6 Ba0.4 Nb2 O6 micro-rods are prepared by the molten-salt method with K2 SO4,KCl-K2 SO4,and KCl as *** reveals that the Sr0.6 Ba0.4 Nb2 O6 synthesized with KCl as a flux exhibits a single phase with tetragonal tungsten bronze *** measurement of X-ray diffraction indicates that the Sr0.6 Ba0.4 Nb2 O6 micro-rods synthesized at 1 300℃are *** morphology of the powers is examined by transmission electron *** reveals that the length-diameter ratio of Sr0.6 Ba0.4 Nb2 O6 micro-rods increases with increasing annealing temperature from 900℃to 1 300℃.At 1 300℃,the rod possesses a large length-diameter ratio of 8∶***,the analysis of the piezoelectric properties of single micro-rods using apiezo-response force microscope indicates that the domains of the material are arranged along its radial direction.

关键词： Sr0.6Ba0.4Nb2O6 micro-rods molten salt method X-ray diffraction patterns transmission electron microscope(TEM)imaging piezoresponse force microscope(PFM)detection

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

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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

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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

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

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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

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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

ELASTIC AND PLASTIC DEFORMATIONS OF NICKEL NANOWIRES UNDER UNIAXIAL COMPRESSION

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

基于AdaBoost分类器的典型战术数据链信号识别方法

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

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航天电子对抗 2023年第2期39卷 47-53页

作者：石达宁陈永游刘建陈韵李阳雨中国航天科工集团8511研究所江苏南京210007

现代作战体系主要依靠战术数据链传递战术信息,因此对侦收到的敌方数据链信号进行准确高效识别的重要性日益凸显。现有特征提取方法是基于单一的信号维度,无法在更高维度条件下获得信号多维耦合特征,同时单一分类器分类识别概率不高。... 详细信息

现代作战体系主要依靠战术数据链传递战术信息,因此对侦收到的敌方数据链信号进行准确高效识别的重要性日益凸显。现有特征提取方法是基于单一的信号维度,无法在更高维度条件下获得信号多维耦合特征,同时单一分类器分类识别概率不高。针对此问题,提出在数据链信号时频图和循环谱图中提取多维特征,采用基于AdaBoost算法的自适应优化组合分类器,形成AdaBoost强分类器对数据链信号进行识别。通过仿真分析可知,基于多维特征的AdaBoost强分类器对数据链信号的分类识别,相较于单个分类器,其识别准确率有明显提升,具有良好的应用前景。

关键词：数据链特征提取 AdaBoost分类器信号识别