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Preparation of yBCO Coated Conductors on RABiTS Substrate with Advanced TfA-MOD Method

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稀有金属材料与工程 2011年第S3期40卷 342-345页

作者： zhao xiaohui, Gao Chang, xia yudong, zhang fei, Tao Bowan state key laboratory of electronic thin film and integrated devices,university of electronic science and technology of china, chengdu 610054, china Univ Elect Sci & Technol china State Key Lab Elect Thin Film & Integrated Device Chengdu 610054 Peoples R China

yBCO high temperature coated conductors are the most promising candidate for large scale superconducting transmission cables and fault current limiters. A modified TfA-MOD method was applied to prepare yBCO layer on Rolling Assisted Biaxially Textured Substrate (RABiTS) with textured y 2 O 3 /ySz/CeO 2 buffer layers, resulting in reduced time and cost of fabrication. By using Cu naphthenate instead of Cu(TfA) 2 , the pyrolysis time of the yBCO precursors was reduced significantly. yBCO films with thickness of 2 μm were fabricated with multiple-coating and annealed at high temperature for 2 h. x-ray diffraction analysis revealed that the films were c-axis oriented. The preliminary results of yBCO films yielded 0.2 MA/cm 2 at 77 K and self field. It is believed current carrying ability of yBCO films could be further improved by reducing the reaction rate at the interface between the buffer layer and superconducting layer.

关键词： TfA-MOD coated conductors RABiTS yBCO

MOCVD Preparation of yBCO Coated Conductors on CeO_2/ySz/y_2O_3 Buffered RABiTS Substrate

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稀有金属材料与工程 2011年第S3期40卷 334-337页

作者： Gao Lei, yu Miao, Jing Tongguo, zhang zhao, xue yan, zhao xiaohui, xiong Jie, Tao Bowan state key laboratory of electronic thin films and integrated devices, university of electronic science and technology of china, chengdu 610054, china Univ Elect Sci & Technol china State Key Lab Elect Thin Films & Integrated Devic Chengdu 610054 Peoples R China

Superconducting yBa2Cu3O7-x films were grown on the CeO2/ySz/y2O3 buffered rolling assisted biaxial textured Ni-5at%w substrate by MOCVD method. Self-made y(DPM)3, Ba(DPM)2, and Cu(DPM)2 were used as the precursors. Different ratios of the precursors were applied to optimize the hetero-epitaxial structure and property of yBCO films. x-ray diffraction revealed that yBCO films had excellent in plane texture with full width at half maximum (fwHM) value of (103)=5.6°-6.5° and out-of-plane texture with fwHM of (005)=3.1°-3.7°. The superconductivity of yBCO films was measured. The relationship between the ratios of the precursors and the property of the films were discussed in detail.

关键词： MOCVD yBCO DPM RABiTS coated conductors

Continuous Deposition of Double-sided y_2O_3/ySz/CeO_2 Buffer Layers for Coated Conductors

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稀有金属材料与工程 2011年第S3期40卷 311-314页

作者： xia yudong, zhang fei, zhang Ning, zhang Junfei, Chai Gang, Guo Pei, Jing Tongguo, xiong Jie, zhao xiaohui, Tao Bowan, Li yanrong state key laboratory of electronic thin films and integrated devices, university of electronic science and technology of china, chengdu 610054, china Univ Elect Sci & Technol china State Key Lab Elect Thin Films & Integrated Devic Chengdu 610054 Peoples R China

In this paper, we report a continuous deposition method for double-sided CeO2/ySz/y2O3 buffer layers by reel-to-reel in a D.C. magnetron reactive sputtering system. x-ray diffraction exhibited all the samples were highly c-axis oriented and atomic force microscope observations revealed a smooth, dense and crack-free surface morphology. Out-of-plane, in-plane texture, and surface roughness of multi-buffer layers were improved under optimized deposition conditions. full width at half maximum (fwHM) values of out-of-plane and in-plane were about 4° and 5.5° in 50 cm double-sided buffed template. yBa2Cu3O7-δ films with thickness of 1.2 μm were deposited on both sides of the buffed tape. Both sides showed similar critical current density, Jc (77 K, self field) as 0.8 MA/cm2 and 0.7 MA/cm2, respectively.

关键词： continuous deposition double-sided y2O3/ySz/CeO2 buffer layers

High-precision measurement of low reflectivity specular object based on phase measuring deflectometry

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光电工程 2017年第8期44卷 772-780页

作者： yuxiang wu Huimin yue yong liu state key laboratory of electronic thin films and integrated devices School of Optoelectronic Information University of Electronic Science and Technology of China

Phase measuring deflectometry(PMD)is a robust,noncoherent technique for the characterization of specular *** measuring high specular reflectivity surface,PMD can deliver micron radian range local ***,when the measured surface has low specular reflectivity,the accuracy of the measured gradient is low since the captured fringe pattern shows low signal to noise *** phase error characteristics in PMD system when testing low reflectivity surfaces are *** analysis illustrates that the random phase error increases rapidly while the nonlinear error drops slowly with the decreasing of the tested surface *** order to attain high precision measurement of low reflectivity specular surface,a robust error reduction method based on wavelet de-noising is proposed to reduce the phase *** error reduction method is compared with several other normally used methods in both simulation and experiment *** method based on the wavelet de-noising shows better performance when measuring the low reflectivity specular surface.

关键词：光电工程电学技术测试调整

Layer-by-layer assembly carbon nanotubes thin film based gas sensors for ammonia detection

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science china(Information sciences) 2011年第12期54卷 2700-2706页

作者： SUN Ping 1,2 , JIANG yaDong 1* , xIE Guangzhong 1 , DU xiaoSong 1 , LI xian 1 & HU Jia 1 1 School of Optoelectronic Information, state key laboratory of electronic thin films and integrated devices, university of electronic science and technology of china (UESTC), chengdu, 610054, china 2 Life and Physical science College, Sichuan Agricultural university, ya’an 625014, china School of Optoelectronic Information State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China (UESTC) Life and Physical science College Sichuan Agricultural University

Single walled carbon nanotubes (SwNTs) were deposited on interdigital electrode (IDE) devices and quartz crystal microbalance (QCM) devices through layer-by-layer self-assembly method to fabricate resistance sensitive and mass sensitive gas sensors, respectively. Their ammonia gas-sensitive characteristics were detected at different temperature. It is revealed that the SwNTs based mass sensitive gas sensor has good sensing properties at room temperature. However, the SwNTs based resistance sensitive gas sensor has irreversible response for ammonia gas. when the temperature increases, the noise of SwNTs based mass sensitive gas sensor increases and the gas sensitive characteristic decreases. Meanwhile, the humidity effect is also discussed. It is important to optimize gas sensor by making it work at an appropriate external environment.

关键词： layer-by-layer self-assembly carbon nanotube gas sensor

Temperature dependence of the thickness and morphology of epitaxial graphene grown on SiC (0001) wafers

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Chinese Physics B 2012年第4期21卷 438-441页

作者：郝昕陈远富李萍剑王泽高刘竞博贺加瑞樊睿孙继荣张万里李言荣 state key laboratory of electronic thin films and integrated devices University of Electronic Science and Technology of ChinaChengdu 610054China Beijing National laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China

Epitaxiai graphene is synthesized by silicon sublimation from the Si-terminated 6H SiC substrate. The effects of graphitization temperature on the thickness and surface morphology of epitaxial graphene are investigated. x-ray photoelectron spectroscopy spectra and atomic force microscopy images reveal that the epitaxial graphene thickness increases and the epitaxial graphene roughness decreases with the increase in graphitization temperature. This means that the thickness and roughness of epitaxial graphene films can be modulated by varying the graphitization temperature. In addition, the electrical properties of epitaxial graphene film are also investigated by Hall effect measurement.

关键词： epitaxial graphene thickness morphology graphitization temperature

Recent advances and perspectives in Mxene-based cathodes for aqueous zinc-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1752-1765页

作者： Aiduo wu Tianhao wang Long zhang chen chen Qiaomin Li xuanhui Qu yongchang liu Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyState Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China School of Materials science and Engineering University of Science and Technology BeijingBeijing 100083China School of Economics and Management University of Science and Technology BeijingBeijing 100083China

Aqueous zinc-ion batteries(AzIBs)show great potential for applications in grid-scale energy storage,given their intrinsic safety,cost effectiveness,environmental friendliness,and impressive electrochemical ***,strong electrostatic interactions exist between zinc ions and host materials,and they hinder the development of advanced cathode materials for efficient,rapid,and stable zn-ion *** and their derivatives possess a large interlayer spacing,excellent hydrophilicity,outstanding electronic conductivity,and high redox *** materials are considered“rising star”cathode candidates for *** comprehensive review discusses recent advances in Mxenes as AzIB cathodes from the perspectives of crystal structure,zn-storage mechanism,surface modification,interlayer engineering,and conductive network design to elucidate the correlations among their composition,structure,and electrochemical *** work also outlines the remaining challenges faced by Mxenes for aqueous zn-ion storage,such as the urgent need for improved toxic preparation methods,exploration of potential novel Mxene cathodes,and suppression of layered Mxene restacking upon cycling,and introduces the prospects of Mxene-based cathode materials for high-performance AzIBs.

关键词： aqueous zinc-ion batteries Mxenes terminal groups interlayer engineering conductive network design

ARPES investigation of the electronic structure and its evolution in magnetic topological insulator MnBi2+2nTe4+3n family

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National science Review 2024年第2期11卷 81-93页

作者： Runzhe xu Lixuan xu zhongkai liu Lexian yang yulin chen state key laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua University School of Physical science and technology Shanghai Tech University and CAS-Shanghai Science Research Center Shanghai Tech laboratory for Topological Physics frontier science Center for Quantum Information Collaborative Innovation Center of Quantum Matter Department of Physics Clarendon LaboratoryUniversity of Oxford

In the past 5 years,there has been significant research interest in the intrinsic magnetic topological insulator family compounds MnBi2+2nTe4+3n（where n=0,1,2…）.In particular,exfoliated thin films of MnBi2Te4have led to numerous experimental breakthroughs,such as the quantum anomalous Hall effect,axion insulator phase and high-Chern number quantum Hall effect without Landau ***,despite extensive efforts,the energy gap of the topological surface states due to exchange magnetic coupling,which is a key feature of the characteristic band structure of the system,remains experimentally *** electronic structure measured by using angle-resolved photoemission （ARPES） shows significant deviation from ab initio prediction and scanning tunneling spectroscopy measurements,making it challenging to understand the transport results based on the electronic *** paper reviews the measurements of the band structure of MnBi2+2nTe4+3nmagnetic topological insulators using ARPES,focusing on the evolution of their electronic structures with temperature,surface and bulk doping and film *** aim of the review is to construct a unified picture of the electronic structure of MnBi2+2nTe4+3ncompounds and explore possible control of their topological properties.

关键词： magnetic topological insulator MnBi2Te4 electronic structure angle-resolved photoemission spectroscopy

Research on heart sound identification technology

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science china(Information sciences) 2012年第2期55卷 281-292页

作者： chenG xiefeng1,3,MA yong2,liu chen1,zHANG xueJun1 & GUO yufeng11School of electronic science and Engineering,Nanjing university of Posts and Telecommunications,Nanjing 210003,china 2School of Computer science and technology,Nanjing university of science and technology,Nanjing 210094,china 3key Lab of Broudbard wireless Communication and Sensor Network technology(Nanjing university of Posts and Telecommunications),Ministry of Education,Nanjing 210094,china School of electronic science and Engineering Nanjing University of Posts and Telecommunications School of Computer science and technology Nanjing University of Science and Technology key Lab of Broudbard wireless Communication and Sensor Network Techn

In this article,both the basic principles and the experimental methods of identity recognition technology based on heart sounds are ***,the characteristics of heart sounds and the feasibility of heart sounds as a biometric were analyzed.A synthetic model of heart sounds was then developed based on a family of wavelets;finally,the characteristic parameters of heart sounds were extracted by using the heart sounds linear band frequency cepstra(HS-LBfC)with a specified configuration,and the similarity distance was adopted for heart sound *** highlight the difference in two heart sound signals between the time and frequency domains,a construction method of the heart sound wavelet,a calculation method of the parameters of a synthetic model,selection of the characteristic parameters of heart sounds and the corresponding data processing technology were *** experimental results showed that the proposed method exhibited excellent performance and practicability.

关键词： biometric wavelet family of heart sounds synthetic model of heart sounds heart sounds linear band frequency cepstra(HS-LBfC)