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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)materials.However,just one type of product can be synthesized by general CVD at one time.Here,we demonstrate a one-step CVD method to simultaneously grow two types of products.Importantly,the products can be completely separated by selecting the deposition region.In 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)approach.High crystal quality of the as-grownα-GeTe nansosheets and Te nanosheets have been proved by the high-resolution transmission electron microscopy(HRTEM)characterization.Further,the field-effect-transistor(FET)based onα-GeTe nanosheet manifests that the as-grownαGeTe nanosheet is a degenerate semiconductor due to the intrinsic Ge vacancies.Additionally,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 air-stability.The 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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Corrosion behavior,antibacterial ability,and osteogenic activity of Zn-incorporated Ni-Ti-O nanopore layers on NiTi alloy

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Journal of Materials Science & Technology 2022年第2期97卷 69-78页

作者： Yonghua Sun yuyu Zhao He Zhang Youjie Rong Runhua yao Yi Zhang Xiaohong yao Ruiqiang Hang Laboratory of Biomaterial Surfaces&Interfaces Institute of New Carbon MaterialsCollege of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China

Development of bone fixation devices with excellent corrosion resistance,antibacterial ability,and osteogenic activity is critical for promoting fracture healing.In this study,Zn-incorporated nanopore(NP)layers were prepared on the NiTi alloy through anodization and hydrothermal treatment.Results show that Zn can be evenly incorporated into the NP layers in the form of ZnTiO_(2).The Zn-incorporated samples exhibit good corrosion resistance and significantly reduce Ni^(2+)release.Meanwhile,the samples can continuously release Zn^(2+),which is responsible for excellent long-term antibacterial ability.Furthermore,the synergetic effect of Zn^(2+) release and nanoporous structure of the NP layers endues the NiTi alloy excellent osteogenic activity,as verified by upregulated alkaline phosphatase activity,secretion of type I collagen,and extracellular matrix mineralization.Therefore,Zn-incorporated Ni-Ti-O NP layers have great potential as biomedical coatings of NiTi-based implant materials.

关键词： Nickel-titanium alloy Anodization Corrosion behavior Antibacterial ability Osteogenic activity

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Biodegradable porous Zn-1Mg-3βTCP scaffold for bone defect repair:In vitro and in vivo evaluation

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Journal of Materials Science & Technology 2023年第31期162卷 189-202页

作者： Runhua yao Hui Wang Ruifeng Shan Lin Liu yuyu Zhao Yonghua Sun Xiaohong yao Di Huang Ruiqiang Hang Shanxi Key Laboratory of Biomedical Metal Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanxi Xinhua Chemical Defense Equipment Research Institute Co. LtdTaiyuan 030008China Research Center for Nano-Biomaterials&Regenerative Medicine Department of Biomedical EngineeringCollege of Biomedical EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030060China

Zn-based materials are promising as bone repair materials,but their poor mechanical property and bioactivity as well as low degradation rate render the potential application.Rational structural and material design can address the concerns.In this study,porous Zn-1 wt.%Mg-3 vol.%β-TCP scaffolds with 40%and 60%preset porosities were fabricated via heating-press sintering using NaCl particles as space holders,and their mechanical properties,in vitro degradation behavior,cytotoxicity and in vivo osteogenic activities were evaluated.The results showed that the actual porosities of the scaffolds were 22%and 50%.Mg exists in the form of Zn 2 Mg and Zn 11 Mg 2,whileβ-TCP evenly distributed in the matrix.The compressive yield strength of scaffolds ranges from approximately 58.46 to 71.04 MPa,which is close to that of cancellous bone.The in vitro degradation tests showed that the corrosion rate of the scaffolds was in the range of about 2.73-4.28 mm y^(-1).Moreover,the scaffolds not only provided great space for osteoblasts adhesion and proliferation in vitro but also possessed favorable degradability and osteogenic activity in vivo.The porous Zn-1 wt.%Mg-3 vol.%β-TCP scaffolds manifest reliable mechanical properties,desirable degradability,and osteogenic activity,which are promising as next-generation bone repair materials.

关键词： Biodegradation Zn-based composites Porous scaffolds Bone repair

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Torquer Current Analysis and an Improved Filter Design for Gyrowheel System

Torquer Current Analysis and an Improved Filter Design for G...

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第36届中国控制会议

作者： yuyu Zhao Hui Zhao Xin Huo Yu yao Harbin Institute of Technology

ISBN: (纸本)9781538629185

Gyrowheel is a unique attitude control device to measure external rates of the spacecraft body as well as provide momentum control.To ensure the external rate sensing accuracy of Gyrowheel,study of the accurate characterization of the currents in the torque coils is performed in this paper.Components of the current signals and the sources of them are analyzed,and an effective filtering method is proposed,which can be used for engineering application.Meanwhile,experimental results are presented to show that the work in this paper is practicable and effective.

关键词： Gyrowheel external rate sensing torquer current frequency spectrum analysis digital filter

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气体检测仪在线计量装置研制

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低温与特气 2022年第4期40卷 13-14,24页

作者：田郁郁姚尧程鹏天津市计量监督检测科学研究院天津300192

气体检测仪的在线计量提高了检测效率,减少了仪器装卸过程中气体的泄漏。移动式可升降的气体检测仪在线计量装置,可以提供计量气体检测仪所需的各种浓度的气体标准物质,满足工厂生产现场各种量程、各种安装位置的气体检测仪的计量需求... 详细信息

气体检测仪的在线计量提高了检测效率,减少了仪器装卸过程中气体的泄漏。移动式可升降的气体检测仪在线计量装置,可以提供计量气体检测仪所需的各种浓度的气体标准物质,满足工厂生产现场各种量程、各种安装位置的气体检测仪的计量需求。同时设计了废气收集装置,防止过多废气排出到大气中,减少了环境污染。提高了气体检测仪的计量覆盖率,确保气体检测仪的量值准确可靠,进而保障生产安全。

关键词：气体检测仪仪器设备在线计量计量标准

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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 fields.However,both current and emerging strategies still suffer from power/time inefficiency,and/or low compatibility,complex device structure.Here 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 junctions.This 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 firstly.Notably,the figure-of-merits for photovoltaic effect like photoelectrical conversion efficiency non-volatilely increases more than one order.Based on this,retina synapse-like vision functions are mimicked.Optoelectronic short-term and long-term plasticity,as well as basic neuromorphic learning and memory rule are achieved without applying driving voltage.Our 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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Thin,soft,3D printing enabled crosstalk minimized triboelectric nanogenerator arrays for tactile sensing

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Fundamental Research 2023年第1期3卷 111-117页

作者： Jian Li Yiming Liu Mengge Wu Kuanming yao Zhan Gao yuyu Gao Xingcan Huang Tsz Hung Wong Jingkun Zhou Dengfeng Li Hu Li Jiyu Li Ya Huang Rui Shi Junsheng Yu Xinge Yu Department of Biomedical Engineering City University of Hong KongHong Kong 999077China Hong Kong Center forCerebra-Cardiovascular Health Engineering Hong Kong Science ParkNew TerritoriesHong KongChina State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054China Shenzhen Research Institute City University of Hong Kong Shenzhen 518057China

With the requirements of self-powering sensors in flexible electronics,wearable triboelectric nanogenerators(TENGs)have attracted great attention due to their advantages of excellent electrical outputs and low-cost processing routes.The crosstalk effect between adjacent sensing units in TENGs significantly limits the pixel density of sensor arrays.Here,we present a skin-integrated,flexible TENG sensor array with 100 sensing units in an overall size of 7.5 cm×7.5 cm that can be processed in a simple,low-cost,and scalable way enabled by 3D printing.All the sensing units show good sensitivity of 0.11 V/kPa with a wide range of pressure detection from 10 to 65 kPa,which allows to accurately distinguish various tactile formats from gentle touching(as low as 2 kPa)to hard pressuring.The 3D printing patterned substrate allows to cast triboelectric layers of polydimethylsiloxane in an independent sensing manner for each unit,which greatly suppresses the cross talk arising from adjacent sensing units,where the maximum crosstalk output is only 10.8%.The excellent uniformity and reproducibility of the sensor array offer precise pressure mapping for complicated pattern loadings,which demonstrates its potential in tactile sensing and human-machine interfaces.

关键词： Tactile sensor Triboelectricnanogenerators Self-powering sensors Crosstalk suppression Human-machine interfaces

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Teaching Reform and Practice of Plant Growth Environment Course in the Context of Application Transformation Development

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Asian Agricultural Research 2017年第7期9卷 76-79页

作者： yuyu ZHANG Jiani LIU Jingxiang HU Jinzhu HUA Liyuan yao Lifang YIN Kunming University/Urban Characteristic Agriculture Engineering Technology Research Center of Yunnan Province/Key Laboratory of Characteristic Biological Resources Development and Utilization in Yunnan Province

Through the personnel training program,revising the syllabus,optimizing teaching contents,reforming teaching methods,strengthening practical teaching links and reforming examination methods,this paper explored the teaching reform and practice of Plant Growth Environment Course,in order to improve the teaching effect,stimulate learning interests of students,and cultivate application type talents meeting social demands.

关键词： Application transformation Plant growth environment Teaching reform

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Study on Antifungal Activity of Some Medicinal Plants against Gray Mold(Botrytis cinerea)

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Agricultural Biotechnology 2016年第6期5卷 46-49页

作者： yuyu ZHANG Jiani LIU Jinxiang HU Jinzhu HUA Liyuan yao Lifang YIN Agriculture College Kunming UniversityKunming 650214China Engineering Research Center for Characteristics Agriculture of Yunnan Province Kunming 650214China

In order to investigate antifungnl effect of medicinal plant extracts on Botrytis cinerea, the antifungal activity of ethanol extracts of 8 medicinal plants in- eluding Ginkgo biloba against Botrytis cinerea was determined by growth rate method. The results showed that Ginkgo biloba and Ginnamomum cassia extracts had significant inhibition effects on B. cinema mycelium growth （P 〈 0.05）, with inhibition rates over 70% and ECho values of 0.027 mg/ml and 0.039 mg/ml, re- spectively, significantly different from the antifungal effects of other kinds of medicinal plants ; and P. ternata and A. tsaoko extracts showed the second highest in- hibition effects, with ECho values of 0. 011 9 and 0. 039 3 mg/ml, respectively. Further experimental application could be carried out.

关键词： Medicinal plant extracts Inhibition rate Gray mold

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匠人董月畅的守艺人生与剑川黑陶业的变迁

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陶瓷 2021年第10期 63-66页

作者：王玉珏尧波四川美术学院重庆401331

作为地方性、民族性传统手工艺的剑川黑陶在改革开放后走向了专门化生产,逐渐形成规模后又急速衰落,在四十余年的时间里历经沉浮。董月畅的制陶人生与这段历史重叠,他凭借勤劳和智慧在沉浮间数次转型,述说了匠人的坚韧与手艺的变迁。

关键词：董月畅剑川黑陶变迁

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