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Ultrahigh Gain of a Vacuum-Ultraviolet Photodetector Based on a Heterojunction Structure of AlN Nanowires and NiO Quantum Dots

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Physical Review Applied 2020年第6期13卷 064036-064036页

作者： Mengting Liu Xianjie Wang Tai Yao Bin Fang Yiyong Wu Chengyue Sun Zhongming Zeng Bo Song School of Physics Harbin Institute of Technology Harbin 150001 China Interdisciplinary Science Research Center Harbin Institute of Technology Harbin 150001 China Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Science Suzhou 215123 China School of Materials Science & Engineering Harbin Institute of Technology Harbin 150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150001 China

Aluminum nitride (AlN) is a promising candidate for the manufacture of vacuum ultraviolet (VUV) photodetectors. However, its poor electrical conductivity limits its applications. Herein, a high-performance AlN nanowire (NW)-NiO quantum dot (QD) based VUV photodetector is constructed via a mixed-dimensional strategy. The formation of isolated nanoscale p-n heterojunctions greatly increases the concentration of photogenerated electrons, resulting in an ultrahigh photoconductive gain (9.96) in the AlN NW-NiO QD material, which is about 27-fold higher than that of AlN NW (0.368). In addition, the significant improvement in both photocurrent and response speed convincingly suggest the great potential of AlN NW-NiO QD based VUV photodetectors. Furthermore, the properties of these photodetectors in an irradiation environment are also evaluated here. It is found that AlN NW exhibits excellent anti-irradiation characteristics towards both electron and proton irradiation, while the AlN NW-NiO QD material also presents promising potential under low-dose electron irradiation. This study can be used as a guideline to design and fabricate high-performance VUV photodetectors based on wide-band-gap semiconductors coupled with other nanostructured systems.

关键词： Optical sources & detectors Optoelectronics Heterostructures III-V semiconductors Junctions Nanowires Quantum dots Transition metal oxides

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Reconstructing the Coordination environment of Fe/Co Dual-atom Sites towards Efficient Oxygen Electrocatalysis for Zn–Air Batteries

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Angewandte Chemie 2024年第7期137卷

作者： Hengqi Liu Jinzhen Huang Kun Feng Rui Xiong Shengyu Ma Ran Wang Prof. Qiang Fu Moniba Rafique Prof. Zhiguo Liu Prof. Jiecai Han Daxing Hua Prof. Jiajie Li Prof. Jun Zhong Prof. Xianjie Wang Prof. Zhonglong Zhao Tai Yao Prof. Sida Jiang Prof. Ping Xu Prof. Zhihua Zhang Prof. Bo Song National Key Laboratory of Laser Spatial Information Harbin Institute of Technology Harbin 150001 China School of Physics Harbin Institute of Technology Harbin 150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150001 China Electrochemistry Laboratory Paul Scherrer Institute CH-5232 Villigen PSI Switzerland Institute of Functional Nano and Soft Materials Laboratory Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Suzhou 215123 China School of future technology Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering University of Jinan Jinan 250022 China School of Physical Science and Technology Inner Mongolia University Hohhot 010021 China National Key Laboratory of Space Environment and Matter Behaviors Harbin Institute of Technology Harbin 150001 China State Key Laboratory of Space Power-Sources School of Chemistry Chemical Engineering Harbin Institute of Technology Harbin 150001 China School of Materials Science Engineering Dalian Jiaotong University Dalian 116028 China Laboratory for Space Environment and Physical Sciences Frontiers Science Center for Matter Behave in Space Environment Harbin Institute of Technology Harbin 150001 China Zhengzhou Research Institute Harbin Institute of Technology Zhengzhou 450046 China

Dual-atom catalysts with nitrogen-coordinated metal sites embedded in carbon can drive the oxygen reduction and evolution reactions (ORR/OER) in rechargeable zinc–air batteries (ZABs), and the further improvement is limited by the linear scaling relationship of intermediate binding energies in the absorbate evolution mechanism (AEM). Triggering the lattice oxygen mechanism (LOM) is promising to overcome this challenge, but has yet been verified since the lacking of bridge oxygen (O) in the rigid coordination environment of the metal centers. Here, we demonstrate that suitably tailored dual-atom catalysts of FeCo−N−C can undergo out-plane and in-plane reconstruction to form the both axial O and bridge O at the metal centers, and thus activate the LOM pathway. The tailored FeCo−N−C with shortened Fe−N bonds also favors the ORR process, therefore is a promising dual-atom oxygen catalyst. The assembled rechargeable ZABs demonstrate a peak power density of 332 mW cm −2 , and exhibit no notable decline after ~720 h of continuous cycling.

关键词： Tailoring coordination environment lattice oxygen mechanism oxygen evolution reaction oxygen reduction reaction rechargeable zinc–air batteries

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Enhanced multiphoton photoluminescence in metaphotonics

Enhanced multiphoton photoluminescence in metaphotonics

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Conference on Lasers and Electro-Optics (CLEO)

作者： Pavel Tonkaev Yubin Fan Yuhan Wang Jiecai Han Anastasia Zalogina Aditya Tripathi Hoo-Cheol Lee Hong-Gyu Park Sergey Makarov Sergey Kruk Qinghai Song Shumin Xiao Yuri Kivshar Nonlinear Physics Center Research School of Physics Australian National University Canberra ACT Australia ITMO University St. Petersburg Russia Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Shenzhen Graduate School Harbin Institute of Technology Shenzhen P. R. China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin P. R. China Department of Physics Korea University Seoul Republic of Korea Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan P. R. China

We study multiphoton photoluminescence from several types of nonlinear resonant metaphotonic structures. We develop a general theoretical approach to describe such nonlinear effects and confirm our predictions in expe... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Laser theory Photoluminescence Metasurfaces Perovskites Electo-optic effects

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Aluminate/Co Composite Absorbing Materials Developing for Elevated-Temperature and High-Efficiency Electromagnetic Absorbing (EMA) Materials

SSRN

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SSRN 2025年

作者： Guan, Zhen-Jie Yang, Bo-An Yuan, Yong Jiang, Jian-Tang Li, Yang Song, Bo Sun, Xue-Yin Gong, Yuan-Xun Yan, Shao-Jiu Shao, Wen-Zhu Zhen, Liang School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China School of Materials and Metallurgy University of Science and Technology Liaoning Liaoning 114051 China Shanghai Aerospace Precision Machinery Research Institute Shanghai201109 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Aerospace Research Institute of Special Material and Processing Technology Beijing100074 China Beijing Institute of Aeronautical Materials Beijing100095 China Nanjing University of Aeronautics and Astronautics Nanjing210016 China

For the design requirements of structural/functional integrated components, it is increasingly urgent to find EMA materials that combine high-efficiency EMA performances with load-bearing capacity. Herein, aluminate/Co composite absorbing materials were prepared through mechanical mixing combined with a hydration hardening process. The microstructures of the composite specimens were controlled by adjusting the shape of Co particles, and cordierite particles were added to further regulate the distribution of Co particles. Compared to spherical Co particles, flake-shaped Co particles exhibit superior electromagnetic parameters. However, the excessively high conductivity of Co flakes filled specimen leads to a significant degradation in their impedance matching, resulting in a rapid attenuation of the electromagnetic performances. The temperature-dependent ionic conductivity plays an important role in controlling the elevated-temperature conductivity and can be suppressed by adding a second dielectric component. For a 2 mm composite specimen, the maximum reflection loss (RLmax) reaches -13.1 dB, and the effective absorption bandwidth (RL © 2025, The Authors. All rights reserved.

关键词： Composite coatings

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Microstructural evolution and performance of carbon fiber-toughened ZrB_2 ceramics with SiC or ZrSi_2 additive

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Journal of advanced Ceramics 2018年第4期7卷 343-351页

作者： Kaixuan GUI Fangyu LIU Gang WANG Zhongjia HUANG Ping HU School of Materials Science and Engineering Anhui Polytechnic University National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology

ZrB_2–SiC/ZrSi_2 ceramics containing 30 vol% carbon fiber(Cf) additive were fabricated by hot pressing at low temperature(1500 ℃) using submicron ZrB_2 powders, and their microstructural evolution and performance were investigated. The addition of SiC or ZrSi_2 significantly reduced the onset sintering temperature and enhanced the densification of ZrB_2. ZrB_2–ZrSi_2–Cf showed poor performance owing to the serious fiber degradation, while the fiber degradation was effectively inhibited in ZrB_2–SiC–Cf resulting in high fracture toughness, substantial fiber pull-out, and non-brittle fracture mode for such material. The critical thermal shock temperature difference of ZrB_2–SiC–Cf was up to 741 ℃, significantly higher than those of ZrB_2–SiC/ZrSi_2 and ZrB_2–ZrSi_2–Cf. Moreover, this composite displayed a good oxidation resistance at 1500 ℃ in air.

关键词： carbon fibers microstructural evolution hot pressing thermal shock resistance oxidation resistance

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The optimization of process parameters of three-dimensional needled composites based on ANN and GA 22

The optimization of process parameters of three-dimensional ...

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22nd International Conference on Composite Materials, ICCM 2019

作者： Qi, Yun-Chao Fang, Guo-Dong Liang, Jun Xie, Jun-Bo Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of Technology Harbin15008 China School of Aerospace Engineering Beijing Institute of Technology Beijing100081 China Key Laboratory of Advanced Textile Composite Materials of Ministry of Education Tianjin Polytechnic University Tianjin300387 China

To build the relationship between needled process parameters and C/C-SiC composites stiffness, and get better process parameters to improve the stiffness performances of composites, a surrogate model for optimizing process parameters of three dimensional needled preforms of C/C-SiC composites was established based on back propagation (BP) neural network combing with improved genetic algorithm. The stiffness prediction was realized by BP network. The predicted value of the network is almost identical with the finite element calculation, so the prediction accuracy of the model is high. The genetic strategy and optimization strategy of genetic algorithm were improved. Two improved genetic algorithms were used to optimize the process parameters. The obtained process parameters can significantly improve the stiffness of the material. © 2019 International Committee on Composite Materials. All rights reserved.

关键词： Genetic algorithms

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Hydrophobic interaction determines docking affinity of SARS-CoV-2 variants with antibodies

arXiv

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arXiv 2021年

作者： Li, Jiacheng Hou, Chengyu Wang, Menghao Liao, Chencheng Guo, Shuai Shi, Liping Ma, Xiaoliang Zhang, Hongchi Jiang, Shenda Zheng, Bing Ye, Lin Yang, Lin He, Xiaodong National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China School of Electronics and Information Engineering Harbin Institute of Technology Harbin150080 China School of Chemistry and Materials Science Heilongjiang University Harbin150001 China School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney NSW2006 Australia Shenzhen STRONG Advanced Materials Research Institute Co. Ltd Shenzhen518035 China

Preliminary epidemiologic, phylogenetic and clinical findings suggest that several novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants have increased transmissibility and decreased efficacy of several existing vaccines. Four mutations in the receptor-binding domain (RBD) of the spike protein that are reported to contribute to increased transmission. Understanding physical mechanism responsible for the affinity enhancement between the SARS-CoV-2 variants and ACE2 is the "urgent challenge" for developing blockers, vaccines and therapeutic antibodies against the coronavirus disease 2019 (COVID-19) pandemic. Based on a hydrophobic-interaction-based protein docking mechanism, this study reveals that the mutation N501Y obviously increased the hydrophobic attraction and decrease hydrophilic repulsion between the RBD and ACE2 that most likely caused the transmissibility increment of the variants. By analyzing the mutation-induced hydrophobic surface changes in the attraction and repulsion at the binding site of the complexes of the SARS-CoV-2 variants and antibodies, we found out that all the mutations of N501Y, E484K, K417N and L452R can selectively decrease or increase their binding affinity with some antibodies. © 2021, CC BY.

关键词： Antibodies

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In situ grown bifacial graphene stabilizes composite electrode for efficient perovskite solar cells

Research Square

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Research Square 2021年

作者： Lin, Xuesong Su, Hongzhen He, Sifan Song, Yenan Wang, Yanbo Qin, Zhenzhen Wu, Yongzhen Yang, Xudong Han, Qifeng Fang, Junfeng Grätzel, Michael Han, Liyuan State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai200240 China Special Division of Environmental and Energy Science Komaba Organization for Educational Excellence College of Arts and Sciences University of Tokyo Tokyo153-8902 Japan Engineering Research Center for Nanophotonics and Advanced Instrument Ministry of Education School of Physics and Materials Science East China Normal University Shanghai200241 China Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai200237 China Lausanne Switzerland

Instability of rear electrodes undermines the long-term operational durability of efficient perovskite solar cells (PSCs). Here, a composite electrode of copper-nickel (Cu-Ni) alloy stabilized by in situ grown bifacial graphene is designed. The alloying makes the work function of Cu suitable for regular PSCs and Cu-Ni is the ideal substrate for preparing high-quality graphene via chemical vapor deposition, which simultaneously protects the device from oxygen, water and internal components reaction. To rivet the composite electrode with semi-device, a thermoplastic copolymer is employed as an adhesive layer during hot pressing. The resultant device achieved power conversion efficiency of 24.34% with significantly improved stability;the devices without encapsulation retained 97% of their initial efficiency after the damp heat test at 85oC with relative humidity of 85% for 1440 hours and the encapsulated devices maintained 95% of their initial efficiencies after maximum power point tracking under continuous 1 sun illumination for 5000 hours. © 2021, CC BY.

关键词： Nickel alloys

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Overcoming electron/ion transport barriers in NASICON-type cathode through mixed-conducting interphase

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Chinese Chemical Letters 2024年

作者： Nan Zhang Qian Yan Xiaorui Dong Jingyang Wang Fan Jin Jiaxuan Liu Dianlong Wang Huakun Liu Bo Wang Shixue Dou State Key Laboratory of Space Power-Sources School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150080 China School of Sustainable Energy and Resources School of Materials Science and Intelligent Engineering Nanjing University Suzhou 215163 China Institute of Energy Material Science University of Shanghai for Science and Technology Shanghai 200093 China Institute for Superconducting & Electronic Materials Australian Institute of Innovative Materials University of Wollongong Wollongong NSW 2500 Australia

The NASICON-structured Na 3 MnTi(PO 4 ) 3 (NMTP) cathode has attracted widespread attention due to its prominent thermal stability, stable 3D structure and rapid sodium ion transport channel. However, the poor cycling stability, limited electronic conductivity and phase transition represent significant obstacles to for its commercialization. Herein, an innovative mixed-conducting interphase, comprising amorphous carbon and Ti 3 C 2 -MXene, was developed for NMTP. NMTP particles are evenly dispersed on the MXene sheets through electrostatic adsorption, and MXenes can also regulate the growth of NMTP crystals and provide a large number of active sites in contact with the electrolyte. Furthermore, DFT calculations demonstrate that MXene enhances both electron and ion transport processes. Therefore, the mixed-conducting interphase, forming an interconnected network on the NMTP surface, serves as an artificial cathode electrolyte interface, significantly enhancing the dynamic processes and cycle stability of the NMTP cathode. The NMTP/C@Ti 3 C 2 exhibits a fully reversible three-electron redox reaction and inhibited voltage hysteresis. An excellent reversible capacity of 158.2 mAh/g is achieved at 0.2 C, corresponding to an extremely high energy density of 466.6 Wh/kg. This study presents an effective approach for developing high-energy SIB cathodes.

关键词： Sodium-ion batteries NASICON structure Na 3 MnTi(PO 4 ) 3 Mixed-conducting interphase MXenes

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Wide tunable laser based on electrically regulated bandwidth broadening in polymer-stabilized cholesteric liquid crystal

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Photonics Research 2019年第2期7卷 137-143页

作者： HONGBO LU CHENG WEI QIANG ZHANG MIAO XU YUNSHENG DING GUOBING ZHANG JUN ZHU KANG XIE XIAOJUAN ZHANG ZHIJIA HU LONGZHEN QIU Key Laboratory of Special Display Technology National Engineering Laboratory of Special Display TechnologyState Key Laboratory of Advanced Display TechnologyAcademy of Opto-Electronic TechnologyHefei University of Technology Key Laboratory of Advanced Functional Materials and Devices Anhui ProvinceSchool of Chemistry and Chemical EngineeringHefei University of Technology School of Instrument Science and Opto-Electronics Engineering Hefei University of Technology Aston Institute of Photonic Technologies Aston University State Key Laboratory of Environment-Friendly Energy Materials Southwest University of Science and Technology

Electrically responsive photonic crystals represent one of the most promising intelligent material candidates for technological applications in optoelectronics. In this research, dye-doped polymer-stabilized cholesteric liquid crystals(PSCLCs) with negative dielectric anisotropy were fabricated, and mirrorless lasing with an electrically tunable wavelength was successfully achieved. Unlike conventional liquid-crystal lasers, the proposed laser aided in tuning the emission wavelength through controlling the reflection bandwidth based on gradient pitch distribution. The principal advantage of the electrically controlled dye-doped PSCLC laser is that the electric field is applied parallel to the helical axis, which changes the pitch gradient instead of rotating the helix axis, thus keeping the heliconical structure intact during lasing. The broad tuning range(～110 nm) of PSCLC lasers,coupled with their stable emission performance, continuous tunability, and easy fabrication, leads to its numerous potential applications in intelligent optoelectronic devices, such as sensing, medicine, and display.

关键词： Wide tunable laser electrically polymer-stabilized

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