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The effect of lateral growth of self-assembled GaN microdisks on UV lasing action

Nano Research 2023年第8期16卷 11096-11106页

作者： Zhiwei Si Zongliang Liu Xiaoxuan Wang Chunxiang Xu Wei Lin Xiaoxuan Luo Feng Li Xiaoming Dong Shunan Zheng Xiaodong Gao Jianfeng Wang Ke Xu School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of SciencesSuzhou 215123China Suzhou Nanowin Science and Technology Co Ltd.Suzhou 215123China Shenyang National Laboratory for Materials Science Jiangsu Institute of Advanced SemiconductorsSuzhou 215123China State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Key Laboratory for Physical Electronics and Devices of the Ministry of Education&Shaanxi Key Lab of Information Photonic Technique School of Electronic Science and EngineeringFaculty of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China

There are significant differences in the extent of impurity incorporation on different crystallographic directions of GaN microstructures,and the impurity-related deep energy level behavior will have a significant impact on device ***,a comprehensive understanding of the effect of lateral growth on device performance has not been achieved due to the lack of comprehensive spatial distribution characterization of the optical behavior and impurity incorporation in GaN *** present a comprehensive study of the optical behavior and growth mechanism of self-assembled GaN microdisks using nanoscale spatially resolved cathodoluminescence(CL)*** have found a clear growth orientation-dependent optical behavior of the lateral and vertical growth sectors of self-assembled GaN *** lateral growth sector,i.e.,the{101¯1}-growth sector,forms six side facets of the microdisk and shows significant near-bandgap emission(NBE)and weak deep energy level *** effect enhanced emission was found for the first time in such a truncated hexagonal Na-flux GaN microdisk system with an ultra-smooth surface(Ra<0.7 nm)and low *** self-assembled microdisk shows significant ultraviolet(UV)lasing action(main lasing peak wavelength 370.9 nm,quality factor 1278,threshold 6×10^(4)μJ/cm^(2))under pulsed optical *** believe that the appearance of UV lasing action may be related to the light limitation on the six side facets of the lateral growth of the GaN microdisk,the high structural quality,the low content of deep energy level defects,the low surface roughness,and the low stress.

关键词： homogeneous lateral epitaxy spatially resolved cathodoluminescence deep energy level GaN microdisk lasing

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The exclusive surface and electronic effects of Ni on promoting the activity of Pt towards alkaline hydrogen oxidation

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Nano Research 2022年第7期15卷 5865-5872页

作者： Kuncan Wang Hao Yang Juntao Zhang Guomian Ren Tao Cheng Yong Xu Xiaoqing Huang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China

Ni modification is considered as an efficient strategy for boosting the performance of Pt towards alkaline hydrogen oxidation reaction(HOR),yet its specific role is largely ***,ultrathin Pt nanowires(NWs)are selected as models for revealing the significance of Ni modification on HOR by precisely positioning Ni on distinct positions of Pt *** solely influences the electronic properties of Pt and thus weakens*H adsorption when it is located in the core of PtNi alloyed NWs,leading to a moderate improvement of alkaline HOR *** Ni is distributed in both core and surface of PtNi alloyed NWs,Ni strongly weakens*H adsorption but strengthens*OH *** the other hand,the electronic properties of Pt are hardly influenced when Ni is deposited on the surface of Pt NWs,on which the strong*H and*OH adsorptions lead to the improved HOR *** work reveals the significance of Ni modification on HOR,but also promotes the fundamental researches on catalyst design for fuel cell reactions and beyond.

关键词： ultrathin Pt nanowire surface decoration Ni location electronic property hydrogen oxidation reaction

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Dual-Function Hollow Mos2 Nanocages Decorated on Graphene Sheets as Efficient Sulfur Hosts for advanced Lithium-Sulfur Batteries

SSRN

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SSRN 2024年

作者： Lu, Junhong Zhang, Yanlin Huang, Jie Jiang, Haoyang He, Dafang Chen, Haiqun Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation Center Changzhou University Jiangsu Changzhou213164 China

Due to the presence of polysulfide shuttling, serious electrode expansion, and the low electrical conductivity of sulfur materials at room temperature, the commercialization of Li-S batteries is still not feasible. In this study, we have synthesized unique hollow molybdenum disulfide nanocages/reduced graphene oxide (H-MoS2/rGO) composites to be employed as highly effective cathodes for Li-S batteries. In this well-designed structure, the hollow MoS2 nanocages are tightly bound by C-O-Mo bonds and uniformly distributed across the graphene sheets. The dual-function MoS2 nanocages can adsorb polysulfides by Mo-S bond and accelerate the conversion reaction of S8 and Li2S. Moreover, the 3D rGO network with abundant pores effectively reduces the diffusion path and enhances the rapid transport of electrons and ions. The hybrid H-MoS2/rGO cathodes with these advantages exhibit a remarkable initial discharge capacity of 800.4 mAh g-1 at 1 C, as well as a high specific discharge capacity of 596.6 mAh g-1 that remains consistent over 250 cycles. © 2024, The Authors. All rights reserved.

关键词： Cathodes

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Stress compensation based on interfacial nanostructures for stable perovskite solar cells

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Interdisciplinary Materials 2023年第2期2卷 348-359页

作者： Cheng Zhu Xi Wang Hangxuan Li Chenyue Wang Ziyan Gao Pengxiang Zhang Xiuxiu Niu Nengxu Li Zipeng Xu Zhenhuang Su Yihua Chen Huachao Zai Haipeng Xie Yizhou Zhao Ning Yang Guilin Liu Xueyun Wang Huanping Zhou Jiawang Hong Xingyu Gao Yang Bai Qi Chen Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications MIIT Key Laboratory for Lowdimensional Quantum Structure and DevicesExperimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijingChina School of Aerospace Engineering Beijing Institute of TechnologyBeijingChina Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijingChina Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghaiChina Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangshaChina School of Science Jiangnan University WuxiWuxiJiangsuChina

The long-term stability issue of halide perovskite solar cells hinders their *** residual stress-strain affects device stability,which is derived from the mismatched thermophysical and mechanical properties between adjacent *** this work,we introduced the Rb_(2)CO_(3)layer at the interface of SnO_(2)/perovskite with the hierarchy morphology of snowflake-like microislands and dendritic *** a suitable thermal expansion coefficient,the Rb_(2)CO_(3)layer benefits the interfacial stress relaxation and results in a compressive stress-strain in the perovskite ***,reduced nonradiative recombination losses and optimized band alignment were *** enhancement of open-circuit voltage from 1.087 to 1.153 V in the resultant device was witnessed,which led to power conversion efficiency(PCE)of 22.7%(active area of 0.08313 cm^(2))and 20.6%(1 cm2).Moreover,these devices retained 95%of its initial PCE under the maximum power point tracking(MPPT)after 2700 *** suggests inorganic materials with high thermal expansion coefficients and specific nanostructures are promising candidates to optimize interfacial mechanics,which improves the operational stability of perovskite cells.

关键词： interfacial nanostructures long-term stability perovskite solar cells strain engineering thermal expansion coefficient

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Synthesis of Decoherence-Free Modes in Linear Quantum Passive Systems via Robust Pole Placement

Synthesis of Decoherence-Free Modes in Linear Quantum Passiv...

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2024 IEEE International Conference on Systems, Man, and Cybernetics, SMC 2024

作者： Miao, Zibo Pan, Yu Gao, Qing School of Mechanical Engineering and Automation Adaptive Robotics Harbin Institute of Technology Guangdong Key Laboratory of Intelligent Morphing Mechanisms Shenzhen518055 China The Institute of Cyber-Systems and Control College of Control Science and Engineering Zhejiang University State Key Laboratory of Industrial Control Technology Hangzhou310027 China The School of Automation Science and Electrical Engineering Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing100191 China

ISBN: (纸本)9781665410205

In this paper we extend our previous research on coherent observer-based pole placement approach to study the synthesis of robust decoherence-free (DF) modes for linear quantum passive systems, which is aimed at preservation of quantum information. In particular, DF modes can be generated by placing the poles on the imaginary axis via a coherent feedback design scheme, and these modes can further be simultaneously made robust against perturbations to the system parameters by minimizing the condition number associated with imaginary poles. We develop explicit algebraic conditions for the existence of such a coherent quantum controller, with the corresponding deign procedure provided. Examples are given to illustrate the process of tuning the DF modes towards perfect robustness via the proposed pole placement technique. © 2024 IEEE.

关键词： Poles

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Pulse Signal Acquisition Using Flexible Sensing Dense Array with High Spatial Resolution

Pulse Signal Acquisition Using Flexible Sensing Dense Array ...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： Yue He Ke Sun Fang Wang Tiger H Tao Heng Yang Yi Sun Quan Wang Xinxin Li Zhenjiang Key Laboratory of Advanced Sensing Materials and Devices Jiangsu University Zhenjiang China State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China

ISBN: (数字)9798331508890

ISBN: (纸本)9798331508906

This paper reports a pressure sensing array with high spatial resolution, which, in combination with the proposed cross-sectional feature algorithm, enables measurements with a positional accuracy of at least 0.1 mm. For the first time in human pulse wave testing experiments, we have visualized the lateral offset of the pulse wave. In addition, we found that some people, such as patients with fever and pain, have slightly larger pulse wave offsets than others, which may be described as ‘tight pulse’ in traditional Chinese medicine (TCM).

关键词： Accuracy Pulse measurements Shape Shape measurement Position measurement Time measurement Spatial resolution Arteries Sensor arrays Testing

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Centralized Wi-Fi Access Networks over OFDM-PON with Joint System Load-based Resource Scheduling

Centralized Wi-Fi Access Networks over OFDM-PON with Joint S...

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2023 Opto-Electronics and Communications Conference, OECC 2023

作者： Chen, Yuxuan Li, Jun Wang, Xiang Chang, Tianhai Shen, Gangxiang School of Electronic and Information Engineering Jiangsu Engineering Research Center of Novel Optical Fiber Technology and Communication Network Suzhou Key Laboratory of Advanced Optical Communication Network Technology Suzhou China Huawei Technologies Co. Ltd. China

We propose centralized Wi-Fi access networks over orthogonal frequency division multiplexing (OFDM) passive optical network, in which optical and wireless resources are jointly scheduled based on system load to improv... 详细信息

ISBN: (纸本)9781665462136

关键词： Wi-Fi

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Dual-layer vermiculite nanosheet based hybrid film to suppress dendrite growth in lithium metal batteries

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Journal of Energy Chemistry 2022年第6期31卷 205-210,I0006页

作者： Xiang-Qun Xu Feng-Ni Jiang Shi-Jie Yang Ye Xiao He Liu Fangyang Liu Lei Liu Xin-Bing Cheng Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 211189JiangsuChina School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina School of Chemistry and Materials Science Nanjing University of Information Science&TechnologyNanjing 210044JiangsuChina Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China College of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

Lithium metal anode has become a favorable candidate for next-generation rechargeable ***, the unstable interface between lithium metal and electrolyte leads to the growth of dendrites,resulting in the low Coulombic efficiency and even the safety concerns. Herein, a rigid-flexible dual-layer vermiculite nanosheet(VN) based organic-inorganic hybrid film on lithium metal anode is proposed to suppress dendrite growth and relieve volume fluctuations. The inner mechanically robust VN layer(3 μm thick) enhances the mechanical properties of the protective layer, while the outer polymer(4 μm thick) can enhance the flexibility of the hybrid layer. The Li | Li symmetric cell with protected lithium shows an extended life of over 670 h. The full cell with Li anode protected by dual-layer interface exhibits a better capacity retention of 80% after 174 cycles in comparison to bare Li anode with 94 *** study provides a novel approach and a significant step towards prolonging lifespan of lithium metal batteries.

关键词： Lithium metal anode Dendrite Organic-inorganic hybrid layer Dual-layer interface Two-dimensional vermiculite nanosheet

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Individualization of Assistance Strategy for Hip Extension Assistance based on Emotion-in-the-Loop

Individualization of Assistance Strategy for Hip Extension A...

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2023 IEEE International Conference on robotics and Biomimetics, ROBIO 2023

作者： Wang, Zhuo Yang, Fangliang Chen, Lingxing He, Tingwei Chen, Chunjie Wu, Xinyu Chinese Academy of Sciences Shenzhen Institute of Adanced Technology Shenzhen518055 China University of Chinese Academy of Sciences ShenZhen College of Advanced Technology Shenzhen518055 China Chinese Academy of Sciences Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Shenzhen518055 China Peng Cheng Laboratory Shenzhen518055 China Shandong Zhongke Advanced Technology Co. Ltd Jinan250000 China

ISBN: (纸本)9798350325706

The human-in-the-loop optimization strategy has successfully improved the performance of the exoskeleton, but only considering the effect of physiological parameters, such as individual metabolic cost and joint torque differences, are considered. From a psychological perspective, emotion is also a significant factor affecting human gait character, especially during walking, where there are differences in the biological hip torque under different emotions. Inspired by this, we developed an individualization assistance strategy for hip extension based on Emotion-in-the-Loop (EIL) to improve human-exosuit interaction using emotional feedback. First, we classified four typical emotions based on the Support Vector Machine (SVM), the average accuracy of which reached 92.8%. After that, measuring the biological hip moments under different emotions through a motion capture experiment and the individualization of assistance strategy for hip extension assistance was designed based on the result. In the metabolism experiments, the soft exosuit with the EIL method can significantly further reduce metabolic consumption by about 4.5%, 6.7%, and 3.7% under the emotion of excitement, depression, and fear, respectively, in addition to original metabolic consumption reduction of 7.6%, which demonstrated that applying different assistance forces considering emotional changes can considerably reduce metabolic consumption. In the future, this method can be additionally used on different wearable robots to improve the performance of human-robot interaction. © 2023 IEEE.

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Ingeniously designed Ni-Mo-S/ZnIn_(2)S_(4) composite for multi-photocatalytic reaction systems

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Chinese Chemical Letters 2022年第3期33卷 1468-1474页

作者： Jing Chen Yumei Tang Shihao Wang Lingbin Xie Cheng Chang Xiaolei Cheng Mingming Liu Longlu Wang Lianhui Wang College of Electronic and Optical Engineering&College of Microelectronics Jiangsu Province Engineering Research Center for Fabrication and Application of Special Optical Fiber Materials and DevicesNanjing University of Posts and TelecommunicationsNanjing 210023China State Key Laboratory of Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)&Institute of Flexible Electronics(Future Technology)Nanjing University of Posts and TelecommunicationsNanjing 210023China

Molybdenum disulfide (MoS_(2)) with low cost, high activity and high earth abundance has been found to be a promising catalyst for the hydrogen evolution reaction (HER), but its catalytic activity is considerably limited due to its inert basal planes. Here, through the combination of theory and experiment, we propose that doping Ni in MoS_(2) as catalyst can make it have excellent catalytic activity in different reaction systems. In the EY/TEOA system, the maximum hydrogen production rate of EY/Ni-Mo-S is 2.72 times higher than that of pure EY, which confirms the strong hydrogen evolution activity of Ni-Mo-S nanosheets as catalysts. In the lactic acid and Na_(2)S/Na_(2)SO_(3) systems, when Ni-Mo-S is used as co-catalyst to compound with ZnIn_(2)S_(4) (termed as Ni-Mo-S/ZnIn_(2)S_(4)), the maximum hydrogen evolution rates in the two systems are 5.28 and 2.33 times higher than those of pure ZnIn_(2)S_(4), respectively. The difference in HER enhancement is because different systems lead to different sources of protons, thus affecting hydrogen evolution activity. Theoretically, we further demonstrate that the Ni-Mo-S nanosheets have a narrower band gap than MoS_(2), which is conducive to the rapid transfer of charge carriers and thus result in multi-photocatalytic reaction systems with excellent activity. The proposed atomic doping strategy provides a simple and promising approach for the design of photocatalysts with high activity and stability in multi-reaction systems.

关键词： Molybdenum disulfide(MoS_(2)) Ni-Mo-S nanosheets Multi-reaction systems Hydrogen evolution reaction(HER) Atomic doping strategy

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