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Influence of seeding promoters on the properties of CVD grown monolayer molybdenum disulfide

Nano Research 2019年第4期12卷 823-827页

作者： Peng Yang Ai-Guo Yang Lingxiu Chen Jing Chen Youwei Zhang Haomin Wang Laigui Hu Rong-Jun Zhang Ran Liu xin-ping qu Zhi-Jun Qiu Chunxiao Cong State Key Laboratory of ASIC and System School of Information Science and Technology Fudan University Shanghai 200433 China State Key Laboratory of Functional Material for Informatics Shanghai Institute (rf Microsystem and Information Technology Chinese Academy of Sciences Changning Road 865 Shanghai 200050 China

Chemical vapor deposition (CVD) is the most efficient method to grow large-area two dimensional (2D) transition metal dichiacogenides (TMDCs) in high *** molybdenum disulfide (MoS2) and seed-assistant are the mostly selected 2D TMDC and growth strategy for such CVD processes,*** the advantages of seed catalysts in facilitating the nucleation,achieving higher yield and better repeatability,as well as their effects on the morphologies of as-grown MoS2 have been studied,the influence of seeding promoters on both optical and electrical properties of as-grown monolayer MoS2 is not known comprehensively,which is indeed critical for understanding fundamental physics and developing practical application of such emerging 2D *** this report,we systematically investigated the effect of different seeding promoters on the properties of CVD-grown monolayer *** is found that different seed molecules lead to different impacts on the optical and electrical properties of as-grown monolayer *** three different seed catalysts (perylene-3,4,9,10-tetracarboxylic acid tetrapotassium salt (PTAS),copper phthalocyanine (CuPc),and crystal violet (CV)),PTAS performs better in obtaining large area monolayer MoS2 with good optical quality and high electrical mobility than the other *** work gives a guide for modifying the properties of as-grown monolayer MoS2 and other 2D transition metal dichalcogenides in seeding promoters-assisted synthesis process.

关键词： transition metal dichalcogenides monolayer M0S2 seeding promoters chemical vapor deposition optical and electrical properties

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The Improvement of Bulk-Heterojunction Order in Polymer Photovoltaic Device

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光谱学与光谱分析 2011年第12期31卷 3175-3179页

作者： YUAN Dan CHEN Zhi-jian XIAO Li-xin MU Li-ping qu Bo GONG Qi-huang State Key Laboratory for Mesoscopic Physics and Department of Physics Peking UniversityBeijing 100871China

The blend morphology and vertical arrangement are critical to the performance of organic bulk-heterojunction photovoltaic *** the present paper,the authors proposed a new annealing method that controls the blend morphology and vertical arrangement of two materials by means of simultaneously applying external electrical field and violet irradiation on the active layer of poly(3-hexylthiophene) (P3HT) and -phenyl C61-butyric acid methyl ester(PCBM) during annealing *** using this annealing method,the power conversion efficiency increased by 36%,which was caused by vertical phased-separated blend of crystalline P3HT and PCBM and better charge extraction of electrodes.X-ray photoelectron spectroscopy(XPS) was measured to prove more fullerene derivatives at the organic/cathode interfaces by using this annealing *** X-ray diffraction(XRD) analysis and UV-Vis absorption spectrum analysis also revealed more ordered polymer crystallization.

关键词： Polymer photovoltaic device Bulk-heterojunction Annealing method

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Effects of oxygen plasma etching and post-annealing on Pt Schottky contact on Mg-doped InZnO

Effects of oxygen plasma etching and post-annealing on Pt Sc...

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2012 IEEE 11th International Conference on Solid-State and Integrated Circuit Technology(ICSICT-2012)

作者： Yan-ping Deng Jia-Hong Wu xin-ping qu State key lab of ASIC and system Department of MicroelectronicsFudan University

Mg-doped InZnO（MIZO）films were prepared by sol-gel *** surface of the films was treated by oxygen *** was then deposited on O2-treated films to form MIZO/Pt Schottky *** I-V properties of this structure were studied under different oxygen plasma treatment *** experimental results show that oxygen plasma treatment can improve the Schottky properties by minimizing the surface adsorbates and subsurface defects of MIZO films.

关键词： Plasmas Films Annealing Schottky barriers Zinc oxide Etching

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Tungsten carbides as a diffusion barrier for Cu metallization

Tungsten carbides as a diffusion barrier for Cu metallizatio...

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2006 8th International Conference on Solid-State and Integrated Circuit Technology

作者： Qi Xie Yu-Long Jiang C.Detavernier R.L.Van Meirhaeghe xin-ping qu Department of Solid state science Gent University Asic and systems state key lab Department of MicroelectronicsFudan University

ISBN: (纸本)1424401607

＜正＞Carbides of refractory metals have been used as diffusion barriers due to their high melting point and good thermal and mechanical *** this work binary WC films have been investigated as Cu diffusion barriers by using ex-situ sheet resistance（Rs）,X-ray diffraction（XRD） measurement and in-situ laser light scattering *** was found that the WC film has stronger oxidation resistance and a comparable diffusion barrier performance as W ***,the Cu agglomeration was severe for the Cu/WC/Si structures.

关键词： Tungsten Metallization Optical wavelength conversion X-ray lasers Electrical resistance measurement Optical refraction Thermal stability Optical films X-ray diffraction X-ray scattering

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公共部门人力资源管理改革探讨

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山东行政学院山东省经济管理干部学院学报 2004年第1期 106-107页

作者：陈新春瞿萍中南财经政法大学湖北武汉430064

现代人力资源管理思想正在对公共部门尤其是政府人事管理方式提出挑战。目前,公共部门人力资源管理存在着一些不足,改革的趋向是以现代人力资源管理思想为指导,建立与之相适应的管理制度和方法。

关键词：公共部门政府组织人力资源管理改革

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Grain Growth Kinetics of BaTiO3 Nanocrystals During Calcining Process

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Chinese Journal of Chemical Physics 2008年第3期21卷 295-300页

作者： Xiao-lan Song Xi He Hai-ping Yang Yi-xin qu Guan-zhou Qiu School of Resources Processing and BioenEineerinE Central South University Changsha 410083China College of Chemical Engineering Beijing University of Chemical Technology Beiging 100029China

BaTiO3 nanocrystals were synthesized by sol-gel method using barium acetate （Ba（CH3COO2） and tetrabutyl titanate （Ti（OC4H9）4） as raw materials. Xerogel precursors and products were characterized by means of thermogravimetric/differential scanning calorimetry （TG/DSC）, X-ray diffraction （XRD） and transmission electron microscope （TEM）. The influence of the calcination temperature and duration on the lattice constant, the lattice distortion, and the grain size of BaTiO3 nanocrystals was discussed based on the XRD results. The grain growth kinetics of BaTiO3 nanocrystals during the calcination process were simulated with a conventional grain growth model which only takes into account diffusion, and an isothermal model proposed by qu and Song, which takes into account both diffusion and surface reactions. Using these models, the pre-exponential factor and the activation energy of the rate constant were estimated. The simulation results indicate that the isothermal model is superior to the conventional one in describing the grain growth process, implying that both diffusion and surface reactions play important roles in the grain growth process.

关键词： BaTiO3 nanocrystal Sol-gel method Grain growth kinetics

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Heterostructuring an equiatomic CoNiFe medium-entropy alloy for enhanced yield strength and ductility synergy

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Rare Metals 2022年第8期41卷 2894-2905页

作者： xin-xin Ding Jing Wang Dong Liu Chang Wang ping Jiang Hua qu Guang-Hua Liu Fu-ping Yuan Xiao-Lei Wu School of Physical Science and Technology Tiangong UniversityTianjin300387China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of ScienceBeijing100190China School of Engineering Science University of Chinese Academy of SciencesBeijing100049China Special Steel Department Central Iron and Steel Research InstituteBeijing100081China

High-/medium-entropy alloys(H/MEAs)of face-centered-cubic-structured single phase usually suffer from a glaring drawback of low yield *** worse,the trade-off emerges frustratingly between strength and ductility as strength ***,the lamellar heterostructure(HS)is designed in an equiatomic ternary CoNiFe ME A by means of cold rolling followed by an incomplete recrystallization *** lamellar HS consists of the soft recrystallized grains as well as severely deformed structures which are partly *** comparison to the coarse-grained counterpart,the lamellar HS,shows a well enhanced yield strength-ductility synergy,together with an increased yield *** is ascribed to the hetero-deformation-induced(HDI)stress in HS during tensile ***,the HDI strain hardening is induced,serving as an important addition to the conventional forest *** HDI hardening is evidenced experimentally to account for a large proportion of global strain ***,a fully recrystallized microstructure is obtained to show a simultaneous increase in both yield strength and *** microstructures are evaluated in detail prior to and after tensile deformation by using the electron backscattered diffraction and transmission electron microscope *** mechanism for HDI strain hardening in various microstructures is analyzed to correlate to the evolution of microstructures in terms of the kernel average misorientation values,Schmid factor,and dislocation behaviors in response to plastic deformation.

关键词： Heterostructure(HS) Medium-entropy alloy(MEA) Hetero-deformation Ductility Strength

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High-temperature mechanical properties and deformation behavior of high Nb containing TiAl alloys fabricated by spark plasma sintering

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International Journal of Minerals,Metallurgy and Materials 2012年第4期19卷 354-359页

作者： xin Lu Li-hua Zhao Lang-ping Zhu Bin Zhang Xuan-hui qu State Key Laboratory for Advanced Metals end Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Institute of Aeronautical Materials Beijing 100095 China

A high Nb containing TiA1 alloy was prepared from the pre-alloyed powder of Ti-45Al-8.5Nb-0.2B-0.2W-0.02Y （at%） by spark plasma sintering （SPS）. Its high-temperature mechanical properties and compressive deformation behavior were investigated in a temperature range of 700 to 1050℃ and a strain rate range of 0.002 to 0.2 s 1. The results show that the high-temperature mechanical properties of the high Nb containing TiA1 alloy are sensitive to deformation temperature and strain rate, and the sensitivity to strain rate tends to rise with the deformation temperature increasing. The hot workability of the alloy is good at temperatures higher than 900℃, while fracture occurs at lower temperatures. The flow curves of the samples compressed at or above 900℃ exhibit obvious flow softening after the peak stress. Un- der the deformation condition of 900-1050℃ and 0.002-0.2 s 1, the interrelations of peak flow stress, strain rate, and deformation tempera- ture follow the Arrhenius＇ equation modified by a hyperbolic sine function with a stress exponent of 5.99 and an apparent activation energy of 441.2 ***-1.

关键词： titanium-aluminum alloys spark plasma sintering (SPS) mechanical properties deformation activation energy

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Cutting Performance and Wear Behavior of AITiN-and TiAlSiN-Coated Carbide Tools During Dry Milling of Ti-6Al-4V

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Acta Metallurgica Sinica(English Letters) 2020年第3期33卷 459-470页

作者： Jie Liu Shui-Sheng Zhu xin Deng Jian-Ye Liu Zhong-ping Wang Zhi qu School of Electromechanical Engineering University of Technology Guangzhou 510006China School of Electromechanical Engineering Guangzhou Panyu PolytechnicGuangzhou 511483China Guangdong Hanbang 3d Technology Co. Ltd.Zhongshan 528427China Heyuan Fuma Cemented Carbide Co. Ltd.Heyuan 517583China Guangdong Fenghua Zhuoli Technology Co. Ltd.Foshan 528225China

Machining,especially dry machining of titanium alloys,has been one of the most significant challenges for carbide cutting *** this study,aluminum-rich AlTiN coating,as well as TiAlSiN nanocomposite coating,were successfully employed for dry milling of Ti-6 A1-4 V alloy with high efficiency and long tool *** the cutting speeds of 150 m/min and 200 m/min,the tool life of the TiAlSiN-coated tool exceeds that of AlTiN-coated tool by 32 and 66%,*** wear modes for both coated tools include the uniform flank wear,smooth wear,chipping,coating and substrate flaking,crater and notch wear,and the wear mechanisms include adhesion,diffusion,oxidation and *** them,the wear mechanism is dominated by the adhesion and oxidation *** compared with AlTiN coating,TiAlSiN coating exhibits better mechanical properties and oxidation resistance,which contribute to a better cutting performance,fewer thermal cracks and smaller and uniform workpiece chips during the dry milling of Ti-6 A1-4 V alloy.

关键词： Cutting performance Wear behavior Ti-6Al-4V AlTiN coating TiAlSiN coating

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Observer-based Guidance Law Accounting for Second-order Dynamics of Missile Autopilots

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Journal of Harbin Institute of Technology(New Series) 2013年第1期20卷 17-22页

作者： ping-ping qu Di Zhou Dept. of Control Science and Engineering Harbin Institute of Technology School of Electronics and Information Engineering Shenyang Aerospace University

Accounting for the missile autopilot as second-order dynamics, an observer-based guidance law is designed based on the dynamic surface control method. Some first-order low-pass filters are introduced into the design process to avoid the occurrence of high-order derivatives of the line of sight angle in the expression of guidance law such that it can be implemented in practical applications. The proposed guidance law is effective in compensating the bad influence of the autopilot lag on guidance accuracy. In the simulations of intercepting non maneuvering targets, targets with step acceleration, and targets with sinusoidal acceleration respectively, the guidance law is compared with the adaptive sliding mode guidance law in the presence of missile autopilot lag. The simulation results show that the proposed guidance law is able to guide a missile to accurately intercept a maneuvering target, even if it escapes in a great and fast maneuver and the autopilot has a relatively large lag.

关键词： missile guidance law dynamic surface control autopilot observer

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