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International Conference on Autonomous Unmanned systems, ICAUS 2021

作者： Huidi, Xiao Jiajia, Zhao Lihui, Wang Qiucheng, Shen Nongjie, Ma Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Ministry of Education School of Instrument Science and Engineering Southeast University Nanjing210096 China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing China

ISBN: (纸本)9789811694912

To realize the defect detection of Photovoltaic (PV) modules based on infrared images, a one-stage detector based on FPT and loss function optimization is proposed. Firstly, ResNet50 is selected as the backbone network for feature extraction, combining with the idea of migration learning to strengthen its feature extraction ability. Besides, replacing the traditional feature pyramid with FPT, using Transformer structure help realize the interaction of the same position between different pyramid layers as well as different positions of the same layer, improving the feature fusion capability of the model. Finally, to alleviate the problem of suppression of non-optimal predictions by NMS strategy, a bipartite graph matching algorithm based on loss function minimization is designed to enhance the learning of the distribution of ground truth targets by the network. The dataset is expanded by Mosaic data enhancement method for model training, so as to achieve infrared image-based PV defect detection. Results show that the improved one-stage target detection network has a promising detection effect on PV module defects under infrared images, with the average accuracy improving by 2.20% compared with the original algorithm. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Defects

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Array of single crystalline anatase TiO2 nanotubes with significant enhancement of photoresponse

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Progress in Natural science:Materials International 2021年第4期31卷 536-540页

作者： Lvchao Qiu Ke Fang Yubo Li Shutao Huang Guanxing Li Songda Li Hu He Wentao Yuan Hangsheng Yang Wei Tian Yong Wang State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Center of Electron Microscopy School of Materials Science and Engineering Zhejiang University Key Laboratory of Micro-Nano Electronic Device and Smart System of Zhejiang Province College of Information Science & Electronic Engineering Zhejiang University School of Physical Science and Technology Soochow University

Anatase TiO2nanotubes array（ATONA） has attracted tremendous attention owing to its promising applications in solar cells, water splitting and organic pollutants photocatalytic degradation. However, the activity of ATONAs was greatly suppressed by the grain boundaries existed in the tube walls, which acted as carrier scattering and recombination centers. Herein, we report a novel strategy to prepare array of single crystalline anatase TiO2nanotubes（SC-ATONAs） with significant enhancement of the photocatalytic activity and UV photo response performance compared to the polycrystalline counterparts. The growth of SC-ATONAs was achieved by establishing a crystallization temperature gradient along the tube wall, which ensured the crystallization started from the nucleation of a single nucleus at the bottom of amorphous TiO2nanotubes prepared by Ti anodization. These findings pave the way to prepare single-crystalline nanotubes with superior performance for other materials.

关键词： Single crystallineTiO2 nanotube Crystallization temperature gradient Photo response Photocatalysis

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Time-sequential color code division multiplexing holographic display with metasurface

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Opto-Electronic Advances 2023年第8期6卷 8-16页

作者： Xin Li Qinmiao Chen Xue Zhang Ruizhe Zhao Shumin Xiao Yongtian Wang Lingling Huang Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China MoE Key Laboratory of Photoelectronic Imaging Technology and System and MIIT Key Laboratory of Photonics Information TechnologySchool of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information SystemHarbin Institute of Technology(Shenzhen)Shenzhen 518055China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Color metasurface holograms are powerful and versatile platforms for modulating the amplitude,phase,polarization,and other properties of light at multiple operating ***,the current color metasurface holography can only realize static *** this study,we propose and demonstrate a multiplexing metasurface technique combined with multiwavelength code-division multiplexing(CDM)to realize dynamic *** code references are utilized to record information within a single metasurface and increase the information capacity and security for anticracks.A total of 48 monochrome images consisting of pure color characters and multilevel color video frames were reconstructed in dual polarization channels of the birefringent metasurface to exhibit high information density,and a video was displayed via sequential illumination of the corresponding code patterns to verify the ability of dynamic *** approach demonstrates significant application potential in optical data storage,optical encryption,multiwavelengthversatile diffractive optical elements,and stimulated emission depletion microscopy.

关键词： metasurface color holography dynamic display code division multiplexing

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Ultra-Soft Neural Probe with a Temporary High-Strength U-Section Coating by Picosecond Laser micromachining 22

Ultra-Soft Neural Probe with a Temporary High-Strength U-Sec...

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22nd International Conference on Solid-State Sensors, Actuators and microsystems, Transducers 2023

作者： Sun, Fanqi You, Xiaoli Zhou, Yuhao Wang, Minghao Xu, Mengfei Yuan, Xichen Chang, Honglong Liu, Jingquan Ji, Bowen Collaborative Innovation Center Of Northwestern Polytechnical University Shanghai201108 China Northwestern Polytechnical University Unmanned System Research Institute Xi'an710072 China Northwestern Polytechnical University Ministry Of Education Key Laboratory Of Micro/Nano Systems For Aerospace School Of Mechanical Engineering Xi'an710072 China Hangzhou Dianzi University College Of Electronics And Information Hangzhou310018 China Shanghai Jiao Tong University National Key Laboratory Of Science And Technology On Micro/Nano Fabrication Department Of Micro/Nano Electronics Shanghai200240 China

ISBN: (纸本)9784886864352

This paper reports an ultra-soft neural probe with a temporary high-strength U-section coating of polyethylene glycol (PEG) for the first time. Its fabrication is compatible with MEMS processes, and an ultrathin U-section coating over the probe's back and sidewall is precisely formed by spinning and cold laser cutting. With this novel coating, the probe has both minimized cross-sectional area and sufficient mechanical strength for low-invasive penetration into brain. Besides, the remained ultra-soft deformable probe after PEG dissolution is expected to be the next generation of neural implant for chronic recording. © 2023 IEEJ.

关键词： Picosecond Laser Cutting U-section Coating Ultra-soft Neural Probe

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Facile synthesis of ironenickelecobalt ternary oxide(FNCO)mesoporous nanowires as electrode material for supercapacitor application

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Journal of Materiomics 2022年第1期8卷 221-228页

作者： Muhammad Usman Muhammad Tayyab Ahsan Sofia Javed Zeeshan Ali Yiqiang Zhan Irfan Ahmed Sajid Butt Mohammad Islam Asif Mahmood M.Aftab Akram School of Chemical and Materials Engineering National University of Sciences and Technology(NUST)Sector H-12Islamabad44000Pakistan Department of Materials Science and Engineering College of EngineeringPeking University100871BeijingChina State Key Laboratory of ASIC and System Center of Micro-Nano SystemSISTFudan UniversityShanghai200433China Department of Materials Science and Engineering Institute of Space TechnologyIslamabad44000Pakistan New Mexcico Institute of Mining&Technology SocorroNM 87801USA School of Chemical and Biomolecular Engineering The University of Sydney2006SydneyAustralia

Transition Metal Oxides have drawn significant attention due to their reversible chemical redox reaction and long-life *** agglomeration and shrinkage/expansion of transition metal oxides in the nanosize regime have a noticeable effect on their electrochemical *** in this work,mesoporous nanowires(NWs)with a typical composition of iron-nickel-cobalt ternary oxide(FNCO)are synthesized using a simple,facile and cost-effective hydrothermal process followed by furnace *** NWs are then extensively investigated as an electrode material for supercapacitor *** compare the electrochemical properties,nanowires of nickel-cobalt oxide(NCO),iron-cobalt oxide(FCO)and cobalt oxide(CO)were also produced by following the same *** FNCO NWs are found to overcome the shortcomings in the electrochemical energy storage devices by exhibiting higher values of specific capacitance(2197 Fg^(-1))and energy density(109 Whkg^(-1))at 1 Ag^(-1) current ***,the FNCO NWs also showed a cyclic charge/discharge stability of 96%even up to 20,000 ***,a FNCO//graphene asymmetric device,fabricated with FNCO NWs and graphene as positive and negative electrodes,respectively,which exhibit high energy density(47 Whkg^(-1)),power density(375 Wkg^(-1))and excellent capacitance retention(86%)after 15,000 cycles.

关键词： Electrochemistry Hydrothermal synthesis Nanowires Supercapacitor Transition metal oxides

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A novel cross-scale nanopositioning stage based on dual piezoelectric stick-slip actuation with a shared flexible hinge

A novel cross-scale nanopositioning stage based on dual piez...

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International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS)

作者： Siyuan Meng Junhui Zhu Yong Wang Luoning Shi Jia Yu Dongmei Wu Wei Dong Changhai Ru State Key Laboratory of Ro-botics and System Harbin Institute of Technology Harbin China School of Electronic and Infor-mation Engineering Suzhou University of Science and Technology Suzhou China Micro-Nano Automation Institute JITRI Suzhou China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China School of Electronic and Information Engineering Suzhou University of Science and Technology Suzhou China

ISBN: (数字)9798350376807

ISBN: (纸本)9798350376814

This paper presents a novel cross-scale nanopositioning stage that integrates the advantages of piezoelectric stick-slip positioners and piezoelectric scanners, utilizing the concept of macro-micro positioning. Initially, a unique structural design featuring a single flexible hinge shared by a small and a large PZT is proposed to reduce the stage's size effectively, enabling millimeter-scale strokes with nanometer-scale positioning accuracy. Subsequently, the cross-scale motion generation mechanism of the dual piezoelectric stick-slip drive is investigated, leading to the development of a system-level dynamics model for the proposed positioning stages. The mechanism design is further optimized to enhance performance. A prototype is manufactured, and a series of experiments are conducted to evaluate the stage's performance. Results indicate that the proposed positioning stage achieves a maximum motion range of 20 mm and a minimum step length of 70 nm in small piezoceramic macro-motion stepping mode, along with a maximum scanning range of 4.9 μm and a motion resolution of 16 nm in large pie-zoceramic micro-motion scanning mode. Moreover, the compact structure of the stage (30×17×8 mm 3 ) supports a maximum motion speed of 10 mm/s and a maximum load of 2 kg. Experi-mental validation confirms the feasibility of the proposed stage, demonstrating nanometer positioning resolution, high accuracy, high speed, and large travel range. These attributes highlight the significant potential of the proposed stage in various in-situ SEM nanorobotic instrument systems.

关键词： Accuracy Automation Nanopositioning Instruments Dynamics Prototypes Mechanism design

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There is plenty of room at the top:generation of hot charge carriers and their applications in perovskite and other semiconductor-based optoelectronic devices

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Light(science & Applications) 2021年第9期10卷 1630-1657页

作者： Irfan Ahmed Lei Shi Hannu Pasanen Paola Vivo Partha Maity Mohammad Hatamvand Yiqiang Zhan State Key Laboratory of ASIC and System Centre of Micro-Nano SystemSISTFudan University200433ShanghaiChina Department of Physics Government Postgraduate College(Higher Education Department-HED)Khyber Pakhtunkhwa21300MansehraPakistan State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-PhotonicsFudan University200433ShanghaiChina Faculty of Engineering and Natural Sciences Tampere UniversityFI-33014TampereFinland KAUST Solar Center Division of Physical Science and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal23955-6900RiyadhKingdom of Saudi Arabia

Hot charge carriers(HC)are photoexcited electrons and holes that exist in nonequilibrium high-energy states of photoactive *** cooling time and rapid extraction are the current challenges for the development of future innovative HC-based optoelectronic devices,such as HC solar cells(HCSCs),hot energy transistors(HETs),HC photocatalytic reactors,and lasing *** on a thorough analysis of the basic mechanisms of HC generation,thermalization,and cooling dynamics,this review outlines the various possible strategies to delay the HC cooling as well as to speed up their *** materials with slow cooling behavior,including perovskites and other semiconductors,are thoroughly *** addition,the opportunities for the generation of plasmon-induced HC through surface plasmon resonance and their technological applications in hybrid nanostructures are discussed in *** judiciously designing the plasmonic nanostructures,the light coupling into the photoactive layer and its optical absorption can be greatly enhanced as well as the successful conversion of incident photons to HC with tunable energies can also be ***,the future outlook of HC in optoelectronics is highlighted which will provide great insight to the research community.

关键词： optoelectronic charge plenty

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In situ induced cation-vacancies in metal sulfides as dynamic electrocatalyst accelerating polysulfides conversion for Li-S battery

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Journal of Energy Chemistry 2022年第12期75卷 74-82,I0003页

作者： Rongrong Li Hao Sun Caiyun Chang Yuan Yao Xiong Pu Wenjie Mai Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhou 510632GuangdongChina CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqing 400044China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Cation vacancy engineering is considered to be one of the effective methods to solve the issues of shuttling and sluggish redox kinetics of Li PSs owing to the intrinsic tunability of electronic ***,cation vacancies are few studied in the Li-S realm due to their complex and rigid preparation *** this work,one-step pyrolysis is reported to in situ introduce Fe-vacancies into iron sulfide(Fe_(0.96)S)as a sulfur *** this host structure,Fe_(0.96)S is first employed as an adsorbent and catalyst in Li-S *** the carbonization process,a tight contact structure of Fe_(0.96)S crystal and carbon network(Fe_(0.96)S@C)is in situ constructed,and the carbon layer as a conductor provides smooth electrons transfer pathways for redox ***,due to the introduction of Fe-vacancies in Fe S crystal,the adsorption capability and catalytic effect for Li PSs have been substantially ***,the presence of Fe_(0.96)S crystal favors the mobility of electron and diffusion of Li+,which is revealed by the experiments and theoretical *** synergy respective advantages effect of Fe_(0.96)S and carbon,the Fe_(0.96)S@C-S cathode delivers high-rate capability at 5.0 C and stable long-life *** under a high sulfur loading of 3.5 mg/cm^(2),the durable cyclic stability is still exhibited with the capacity retention of 93%over 400 cycles at 1.0 C,and the coulombic efficiency is≥98%.Noting that this strategy greatly simplifies the synthetic process of currently known cation-vacancy materials and furnishes a universal mentality for designing both divinable and astonishing new cation-vacancy materials.

关键词： Cation vacancy Fe_(0.96)S@C structure Catalytic conversion Lithium-sulfur battery

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Enhanced Pyroelectric Response in Quenched BNT-Based Lead-Free Ferroelectrics for Uncooled Infrared Detection

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Advanced Functional Materials 2025年

作者： Shen, Meng Zhang, Xian Cen, Fangjie Zhang, Qingfeng Zhang, Haibo Zhang, Guangzu Jiang, Shenglin Chen, Yong Hu, Yongming Yao, Kui Hubei Key Laboratory of Micro-Nanoelectronic Materials and Devices Key Laboratory of Intelligent Sensing System and Security of Ministry of Education and School of Microelectronics Hubei University Wuhan430062 China School of Integrated Circuits Engineering Research Center for Functional Ceramics MOE and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan430074 China Ministry of Education Key Laboratory of Green Preparation and Application for Functional Materials Hubei Key Laboratory of Micro-Nanoelectronic Materials and Devices Hubei Key Laboratory of Polymer Materials School of Materials Science & Engineering Hubei University Wuhan430062 China School of Materials Science and Engineering State Key Laboratory of Material Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan430074 China Singapore138634 Singapore

Excellent pyroelectric performance in environmentally friendly lead-free ferroelectrics is highly demanded for uncooled infrared detector. However, the trade-off between room temperature pyroelectric coefficient (proom) and depolarization temperature (Td) remains a major challenge of lead-free ferroelectrics for their device applications. Herein, a superior proom of 13.8 × 10−4 C m−2 K−1 with high Td of 155 °C is achieved in quenched BNT-Fe/Mn-NBT sample. Oxygen vacancy engineering is proposed to solve the constraint between proom and Td in BNT-based ceramics. The local A/B site displacement and oxygen vacancies are constructed in the BNT-Fe/Mn-NBT perovskite structure by quenching treatment, resulting in larger lattice distortion and superior proom. Meanwhile, defect-induced inhomogeneous random field compensates the ferroelectric depolarization field and down-shifts the free energy well, maintaining high Td. The resulting pyroelectric infrared detector made from the high-performance quenched BNT-Fe/Mn-NBT generates the voltage responsivity of 5906 V W−1 and specific detection rate of 1.8 × 108 cm Hz1/2 W−1, which is comparable to the commercial RD-624 type PZT-based pyroelectric infrared detector. © 2025 Wiley-VCH GmbH.

关键词： Perovskite

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Effects of interlayer coupling on the excitons and electronic structures of WS_(2)/hBN/MoS_(2) van der Waals heterostructures

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Nano Research 2022年第3期15卷 2674-2681页

作者： Xudan Zhu Junbo He Rongjun Zhang Chunxiao Cong Yuxiang Zheng Hao Zhang Songyou Wang Haibin Zhao Meiping Zhu Shanwen Zhang Shaojuan Li Liangyao Chen Key Laboratory of Micro and Nano Photonic Structures Ministry of EducationShanghai Engineering Research Center of Ultra-Precision Optical ManufacturingSchool of Information Science and EngineeringFudan UniversityShanghai 200433China State Key Laboratory of ASIC and System School of Information Science and EngineeringFudan UniversityShanghai 200433China Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Grating Technology Laboratory Changchun Institute of Optics and Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China State Key Laboratory of Applied Optics Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

Inserting hexagonal boron nitride(hBN)as barrier layers into bilayer transition metal dichalcogenides heterointerface has been proved an efficient method to improve two dimensional tunneling optoelectronic device ***,the physical picture of interlayer coupling effect during incorporation of monolayer(1L-)hBN is not explicit *** this article,spectroscopic ellipsometry was used to experimentally obtain the broadband excitonic and critical point properties of WS_(2)/MoS_(2)and WS_(2)/hBN/MoS_(2)van der Waals *** find that 1L-hBN can only slightly block the interlayer electron transfer from WS_(2)layer to MoS_(2)***,insertion of 1L-hBN weakens the interlayer coupling effect by releasing quantum confinement and reducing efficient dielectric ***,the exciton binding energies in WS_(2)/hBN/MoS_(2)heterostructures blueshift comparing to those in WS_(2)/MoS_(2)*** this exciton binding energies tuning process,the reducing dielectric screening effect plays a leading *** the meantime,the quasi-particle(QP)bandgap remains unchanged before and after 1L-hBN insertion,which is attributed to released quantum confinement and decreased dielectric screening effects canceling each *** QP bandgap as along with blueshift exciton binding energies lead to the redshift exciton transition energies in WS_(2)/hBN/MoS_(2)heterostructures.

关键词： two-dimensional(2D)van der Waals heterostructure interlayer coupling excitons critical points spectroscopic ellipsometry

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