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One-step method to simultaneously synthesize separable Te and GeTe nanosheets

Nano Research 2022年第7期15卷 6736-6742页

作者： Yuyu Yao xueying zhan Chuyun Ding Feng Wang Yanrong Wang Jia Yang Zhenxing Wang Jun He CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Sino-Danish College University of Chinese Academy of SciencesBeijing 100049China Department of Physics Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric PowerShanghai University of Electric PowerShanghai 200090China Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072China Sino-Danish Center for Education and Research Beijing 100049China

The chemical vapor deposition(CVD)method has been widely used to synthesize high-quality two-dimensional(2D)***,just one type of product can be synthesized by general CVD at one ***,we demonstrate a one-step CVD method to simultaneously grow two types of ***,the products can be completely separated by selecting the deposition *** detail,the controllable and completely separable growth forα-GeTe and Te nanosheets was realized by using one precursor-GeTe powder through the atmospheric pressure CVD(APCVD)*** crystal quality of the as-grownα-GeTe nansosheets and Te nanosheets have been proved by the high-resolution transmission electron microscopy(HRTEM)***,the field-effect-transistor(FET)based onα-GeTe nanosheet manifests that the as-grownαGeTe nanosheet is a degenerate semiconductor due to the intrinsic Ge ***,Te-based FET devices indicate that the good electrical performance of the as-grown Te nanosheet,such as high mobility of 900 cm2·V^(−1)·s^(−1)(at room temperature),high on/off ratio of>106(at 77 K),and good *** developed one-step CVD method shows the huge potentials for high-efficiency and high-quality material growth.

关键词： controllable growth completely separable growth α-GeTe crystal Te crystal high mobility

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Near-infrared optoelectronic synapses based on a Te/α-In2Se3 heterojunction for neuromorphic computing

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Science China(Information Sciences) 2023年第6期66卷 53-62页

作者： Tao YAN Yuchen CAI Yanrong WANG Jia YANG Shuhui LI xueying zhan Fengmei WANG Ruiqing CHENG Feng WANG Jun HE Zhenxing WANG CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology Key Laboratory of Carbon Fiber and Functional Polymers Ministry of EducationBeijing University of Chemical Technology Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education School of Physics and TechnologyWuhan University

Neuromorphic computing based on artificial optoelectronic synapses has attracted considerable attention owing to its high time/power efficiency and parallel processing capability. However, existing devices are mainly suitable for only the visible range. Here, high-performance near-infrared optoelectronic memories and synapses were demonstrated using Te/α-In2Se3heterostructures. Owing to the entangled ferroelectricitysemiconducting properties of α-In2Se3, whose ferroelectric polarizations can be switched by photocarriers that migrated from the Te near-infrared light absorber, the device could be set into a non-volatile highresistance/low-resistance state through the application of positive gate voltages/near-infrared light ***, the device could function as a high-performance photodetector, with a photoresponsive on/off ratio of 5.25 × 104/8.3 × 103and a specific detectivity of 2.6 × 1011/7.5 × 1010Jones at 1550/1940 nm. In addition,the device could function as a multi-state optoelectronic synapse with good stability and high linearity;moreover, using the device, we developed an optoelectronic artificial neural network with high recognition accuracies of 100% and 89.9% for a database composed of 64-pixel letters with 10% and 70% noise levels,respectively. Our work provides a feasible avenue for developing neuromorphic networks applicable in the infrared range.

关键词： near infrared phototransistor two-dimensionalferroelectric semiconductor artificial neural networks optoelectronicsynapses

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Ultrasensitive solar-blind ultraviolet detection and optoelectronic neuromorphic computing using α-In_(2)Se_(3)phototransistors

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Frontiers of physics 2023年第3期18卷 81-90页

作者： Yuchen Cai Jia Yang Feng Wang Shuhui Li Yanrong Wang xueying zhan Fengmei Wang Ruiqing Cheng Zhenxing Wang Jun He CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and TechnologyBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072China

Detection of solar-blind ultraviolet(SB-UV)light is important in applications like confidential communication,flame detection,and missile warning ***,the existing SB-UV photodetectors still show low *** this work,we demonstrate the extraordinary SB-UV detection performance of α-In_(2)Se_(3 )*** from the coupled semiconductor and ferroelectricity property,the phototransistor has an ultraweak detectable power of 17.85 fW,an ultrahigh gain of 1.2×10^(6),a responsivity of 2.6×10^(5) A/W,a detectivity of 1.3×10^(16) Jones and an ultralow noise-equivalent-power of 4.2×10^(–20 )W/Hz1/2 for 275 nm *** performance exceeds most other UV detectors,even including commercial photomultiplier tubes and avalanche *** can be also implemented as an optoelectronic synapse for neuromorphic computing.A 784×300×10 artificial neural network(ANN)based on this optoelectronic synapse is constructed and demonstrated with a high recognition accuracy and good noise-tolerance for the Fashion-MNIST *** extraordinary features endow this phototransistor with the potential for constructing advanced SB-UV detectors and intelligent hardware.

关键词： solar-blind ultraviolet detectors α-In_(2)Se_(3) optoelectronic synapse neuromorphic computing

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Newly developed two-dimensional materials for efficient photocatalytic hydrogen evolution

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Science Bulletin 2019年第14期64卷 958-960页

作者： xueying zhan Fengmei Wang Zhongzhou Cheng Zhenxing Wang Jun He Chinese Academy of Sciences (CAS) Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology Beijing 100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China

Due to the increasing environmental and energy issues, hydrogen, as a clean and non-carbon energy source, has received more and more attention in the past decades. Photocatalysis has been known as a promising approach for hydrogen generation and a key measure in solving serious environmental problems. Different from traditional catalysts, such as ZnO and TiO2, two-dimensional (2D) materials display unique advantages to hydrogen production due to their large specific surface area, high charge migration rate, tunable electronic structure and ultra-lightweight [1]. Especially, 2D materials show short migration distance for the generated electrons and holes, leading to the reduction of electron-hole recombination, which is one of the key factors affecting photocatalytic efficiency [2-4].

关键词： Newly developed two-dimensional materials photocatalytic hydrogen evolution hydrogen generation

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Reconfigurable photovoltaic effect for optoelectronic artificial synapse based on ferroelectric p-n junction

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Nano Research 2021年第11期14卷 4328-4335页

作者： Yanrong Wang Feng Wang Zhenxing Wang Junjun Wang Jia Yang Yuyu Yao Ningning Li Marshet Getaye Sendeku xueying zhan Congxin Shan Jun He CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijing100190China Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan430072China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Sino-Danish college University of Chinese Academy of SciencesBeijing100049China Sino-Danish Centre for Education and Research Beijing100049China School of Physics and Engineering Zhengzhou UniversityZhengzhou450001China

Neuromorphic machine vision has attracted extensive attention on wide ***,both current and emerging strategies still suffer from power/time inefficiency,and/or low compatibility,complex device *** we demonstrate a driving-voltage-free optoelectronic synaptic device using non-volatile reconfigurable photovoltaic effect based on MoTe_(2)/α-In_(2)Se_(3) ferroelectric p-n *** function comes from the non-volatile reconfigurable built-in potential in the p-n junction that is related to the ferroelectric polarization inα-In_(2)Se_(3).Reconfigurable rectification behavior and photovoltaic effect are demonstrated ***,the figure-of-merits for photovoltaic effect like photoelectrical conversion efficiency non-volatilely increases more than one *** on this,retina synapse-like vision functions are *** short-term and long-term plasticity,as well as basic neuromorphic learning and memory rule are achieved without applying driving *** work highlights the potential of ferroelectric p-n junctions for enhanced solar cell and low-power optoelectronic synaptic device for neuromorphic machine vision.

关键词： ferroelectric p-n junction reconfigurable rectification reconfigurable PV effect optoelectronic synaptic devices

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A proton-catalyzing prodrug for PDT and glycolysis inhibitionsynergistic therapy of tumor in spatiotemporal dimensions

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Science China Chemistry 2024年

作者： Miao Li xueying Sun Xiuqin Ma Yang Tan Xiaoyi Jin Yi Wang Fan Yang Qian Li Honglei zhan Xiaojun Peng School of Biological Engineering Dalian Polytechnic University State Key Laboratory of Fine Chemicals Dalian University of Technology

The reactive oxygen species(ROS) generation from photosensitizer in photodynamic therapy(PDT) is limited by tumor *** type-I photosensitizers, e.g., sulfur-substituted Nile blue, still rely on oxygen as the main center for transferring electrons to generate ROS. Cutting off the pathway of oxygen consumption in tumor can help photosensitizers overcome the limitation of low oxygen, in order to efficiently generate more ROS. It is known that glycolysis inhibitor 3-bromopyruvic acid(3-BP), which could specially target mitochondria, can provide more oxygen by inhibiting oxidative phosphorylation. Herein, we successfully designed and synthesized a new 3-BP-coupled sulfur-substituted Nile blue as prodrug(NBBP) for chemical/photodynamic synergistic therapy. Major results indicated that the protons in tumor catalyzed the hydrolysis of NBBP, inhibited photoinduced electron transfer between 3-BP and the photosensitizer in NBBP and further assisted the photosensitizer to be localized in mitochondria, utilizing local oxygen as much as possible and kill tumor cells more efficiently. Moreover, the glycolysis inhibition-induced autophagy was combined with PDT-induced autophagy, which could promote the deaths of tumor *** other remedies exploiting nanomaterials, this construction method of NBBP achieves the efficient synergy of photodynamic therapy and glycolysis inhibition, stronger than their theoretical addition, in spatiotemporal dimensions. Our study provides not only a highly efficient platform for tumor therapy but also a design approach for prodrugs with synergistic effects.

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基于改进A^(*)算法的变电站自动巡检路径规划研究

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机械设计 2024年第S1期41卷 153-158页

作者：赵崇娟朱奕弢胡钰莹严雪莹詹锐烽湖州电力设计院有限公司浙江湖州313000

采用自动巡检设备对变电站开展定期巡检是保障电力设备安全运行的有效措施。对于无人值守和偏远的变电站,自动巡检设备基于预设的作业需求,对变电站相关设备按照规划路径定期巡检,保障变电站设备的安全稳定运行。为解决传统自动巡检设... 详细信息

采用自动巡检设备对变电站开展定期巡检是保障电力设备安全运行的有效措施。对于无人值守和偏远的变电站,自动巡检设备基于预设的作业需求,对变电站相关设备按照规划路径定期巡检,保障变电站设备的安全稳定运行。为解决传统自动巡检设备在路径规划时存在的搜索效率低、不支持大区域复杂环境规划等问题,提高自动巡检设备路径规划收敛速度和大范围复杂环境适应能力。文中基于传统A^(*)路径规划算法进行改进,通过引入网格调控因子克服划分网格不可调整的弊端,使规划过程更有效率。通过修改网格大小以平滑所得规划路径,提高算法避障能力与规划效率。同时增加规划循环机制,解决了传统A^(*)算法在此场景下只能进行单目标路径规划的不足,实现了多个目标点路径连续规划。基于改进的A^(*)算法在模拟变电站厂区开展试验,仿真分析了改进后A^(*)算法在变电站自动巡检设备路径规划中的性能。结果表明,新算法不仅缩短了规划路径且减少了折弯数目,并且可以同时规划多个目标。

关键词： A^(*)算法路径规划自动避障自动巡检设备

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Breakthroughs on tailoring membrane materials for ethanol recovery by pervaporation

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Chinese Journal of Chemical Engineering 2022年第12期52卷 19-36页

作者： Xia zhan xueying Zhao Zhongyong Gao Rui Ge Juan Lu Luying Wang Jiding Li Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry Beijing Technology and Business UniversityBeijing 100048China The Institute of Medicinal Plant Development The Chinese Academy of Medical Sciences(CAMS)and Peking Union Medical College(PUMC)Beijing 100193China Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry UniversityBeijing 100083China The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Bioethanol, as a clean and renewable fuel, has gained increasing attention due to its major environmental benefits. Pervaporation(PV) is a promising and competitive technique for the recovery of ethanol from bioethanol fermentation systems due to the advantages of environmental friendliness, low energy consumption and easy coupling with fermentation process. The main challenge for the industrial application of ethanol perm-selective membranes is to break the trade-off effect between permeability and selectivity. As membrane is the heart of the pervaporation separation process, this article attempts to provide a comprehensive survey on the breakthroughs of ethanol perm-selective PV membranes from the perspectives of tailoring membrane materials to enhance PV separation performance. The research and development of polymeric and organic/inorganic hybrid membranes are reviewed to explore the fundamental structure-property-performance relationships. It is found that mixed matrix membranes with welldesigned membrane structures offer the hope of better control overphysi-/chemical microenvironment and cavity/pore size as well as size distribution, which may provide both high permeability and membrane selectivity to break the trade-off effect. The tentative perspective on the possible future directions of ethanol perm-selective membranes is also briefly discussed, which may provide some insights in developing a new generation of high-performance PV membranes for ethanol recovery.

关键词： Pervaporation Ethanol recovery Microstructure Polymeric membrane Mixed matrix membrane

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LATS1 K751 acetylation blocks activation of Hippo signalling and switches LATS1 from a tumor suppressor to an oncoprotein

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Science China(Life Sciences) 2022年第1期65卷 129-141页

作者： Siyuan Yang Weizhi Xu Cheng Liu Jiaqi Jin xueying Li Yuhan Jiang Lei zhang Xianbin Meng Jun zhan Hongquan zhang Department of Human Anatomy Histology and EmbryologyMOE Key Laboratory of Carcinogenesis and Translational Research and State Key Laboratory of Natural and Biomimetic DrugsPeking University Health Science CenterBeijing 100191China MOE Key Laboratory of Bioinformatics School of Life SciencesTsinghua UniversityBeijing 100084China

Large tumor suppressor 1(LATS1)is the key kinase controlling activation of Hippo signalling ***-translational modifications of LATS1 modulate its kinase ***,detailed mechanism underlying LATS1 stability and activation remains *** we report that LATS1 is acetylated by acetyltransferase CBP at K751 and is deacetylated by deacetylases SIRT3 and *** at K751 stabilized LATS1 by decreasing LATS1 ubiquitination and inhibited LATS1 activation by reducing its ***,LATS1 acetylation resulted in inhibition of YAP phosphorylation and degradation,leading to increased YAP nucleus translocation and promoted target gene ***,LATS1-K751 Q,the acetylation mimic mutant potentiated lung cancer cell migration,invasion and tumor growth,whereas LATS1-K751 R,the acetylation deficient mutant inhibited these *** together,we demonstrated a previously unidentified post-translational modification of LATS1 that converts LATS1 from a tumor suppressor to a tumor promoter by suppression of Hippo signalling through acetylation of LATS1.

关键词： LATS1 acetylation LATS1 activation and inhibition Hippo signalling pathway lung adenocarcinoma

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基于范德华铁电异质结的具有亚5nm沟道亚热电子场效应晶体管

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Science Bulletin 2020年第17期65卷 1444-1450,M0003页

作者：王峰刘佳黄文浩程瑞清尹蕾王俊俊 Marshet Getaye Sendeku 张玉詹雪莹单崇新王振兴何军 CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijing 100190China School of Physics and Technology Wuhan UniversityWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material Physics(Ministry of Education)School of PhysicsZhengzhou UniversityZhengzhou 450052China

本文展示了基于铁电范德华异质结的具有小于5 nm沟道宽度的二维亚热电子场效应晶体管.该器件分别由石墨烯作为电极,二硫化钼作为导电沟道, CuInP2S6作为铁电介电层.研究表明,所制造的长沟道器件在室温下具有3个数量级的开关比,几乎无回... 详细信息

本文展示了基于铁电范德华异质结的具有小于5 nm沟道宽度的二维亚热电子场效应晶体管.该器件分别由石墨烯作为电极,二硫化钼作为导电沟道, CuInP2S6作为铁电介电层.研究表明,所制造的长沟道器件在室温下具有3个数量级的开关比,几乎无回滞,并具有亚热电子的开关特性.此外,本文使用金属碳纳米管作为有效的栅极制备了超短沟道器件.该器件同样表现出亚热电子开关特性,室温下亚阈值摆幅最小可达6.1 mV/dec.

关键词：场效应晶体管开关特性热电子异质结亚阈值摆幅沟道宽度器件开关比

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