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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

Research on solar-blind ultraviolet detectors fabricated on W-MgZnO films

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Research on solar-blind ultraviolet detectors fabricated on ...

Frequency-stabilized Yb：fiber comb with a tapered single-mode fiber

2011中国材料研讨会

作者： Yaonan Hou,Zengxia Mei,Zhanglong Liu,Huili Liang,Shuang Liang,Daqian Ye,Yaoping Liu,Junqiang Li,Xiaolong Du Institute of physics,beijing national laboratory for condensed matter physics,Chinese Academy of Sciences,beijing,{3.,china

＜正＞Solid state ultraviolet（UV）detectors based on wide band gap semiconductors,especially in solar-blind region（220-280nm）,have great potential applications inair/water purification,

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来源： cnki会议评论

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Chinese physics B 2016年第4期25卷 166-170页

作者：谢阳韩海年张龙于子蛟朱政侯磊庞利辉魏志义 School of physics and Optoelectronic Engineering Xidian UniversityXi'an 710071China beijing national laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

We demonstrate a stable Yb：fiber frequency comb with supercontinuum generation by using a specially designed tapered single-mode fiber, in which a spectrum spanning from 500 nm to 1500 nm is produced. The carrier-envelope offset signal of the Yb：fiber comb is measured with a signal-to-noise ratio of more than 40 dB and a linewidth narrower than 120 kHz. The repetition rate and carrier-envelope offset signals are simultaneously phase locked to a microwave reference frequency.

关键词： tapered single-mode fiber supercontinuum generation optical frequency comb

A Novel Interface Engineering Technique for Fabrication of MgZnO/Si Hetero-epitaxial Structure

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A Novel Interface Engineering Technique for Fabrication of M...

Photocatalytic properties of BiOX(X=Cl,Br,and I)

2011中国材料研讨会

作者： Huili Liang,Zengxia Mei,Shuang Liang,Daqian Ye,Zhanglong Liu,Yaoping Liu,Yaonan Hou,Junqiang Li,Xiaolong Du Institute of physics,beijing national laboratory for condensed matter physics,Chinese Academy of Sciences,beijing,{3.,china

＜正＞In recent decades,great efforts have been made on growth of hetero-epitaxial MgZnO[1]films and fabrication of solar-blind（220-280nm）ultraviolet（UV）photodetectors（PDs）[2].For potential

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Rare Metals 2008年第3期27卷 243-250页

作者： AN Huizhong DU Yi WANG Tianmin WANG Cong HAO Weichang ZHANG Junying Center of condensed matter and Materials physics School of Science Beihang University Beijing 100083 China

A novel series of photocatalysts, bismuth oxyhalide （BiOX, X = Cl, Br, and Ⅰ）, were synthesized by a hydrolysis method. The powder sampies were characterized by the use of X-ray diffraction （XRD）, scanning electron microscope, and UV-Vis spectrophotometer. The XRD pattern showed that all the BiOX were well crystallized in the tetragonal structure. The band gaps of the sheet-shaped compounds BiOX （X = Cl, Br, andⅠ） were 3.44, 2.76, and 1.85 eV, respectively. BiOBr showed the highest photocatalytic activity in degrading rhodamine B （RhB） and evolving 02 for its proper valence band （VB）. BiOI has no photocatalytic activity. BiOCl showed the highest activity in decomposing isopropanol because of electron-hole pair separation through trapping electrons by oxygen vacancies.

关键词： photocatalysis rhodamine B isopropanol O2 evolution BiOCl BiOBr BiOI

STUDY ON THE CONCENTRATION DEPENDENCE OF ORIENTATION OF POLYSTYRENE ON SILVER BY THE SERS TECHNIQUE

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Chinese Journal of Polymer Science 2000年第2期18卷 177-180页

作者： Dong-hui Zhang Jin-gui Qin Jing-shu Shen You Wang Wan-jun Liu Department of Chemistry, Wuhan University, Wuhan 43.072, china Polymer physics laboratory, Institute of Chemistry, Chinese Academy of Sciences{3. 100080, china 武汉大学湖北武汉中科院化学所高分子物理及化学国家重点实验室北京

Polystyrene films were adsorbed onto a silver surface from dichloromethane solutions with concentrations of 0.1 to 12 wt%, and then studied by the surface enhanced Raman technique. A critical concentration for coil in... 详细信息

关键词： surface enhanced Raman scattering (SERS) polystyrene concentration dependence

Angular distribution of terahertz emission from laser interactions with solid targets

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Science china(Information Sciences) 2012年第1期55卷 43-48页

作者： DU Fei1,LI Chun1,ZHOU MuLin1,WANG WeiMin1,SU LuNing1,ZHENG Yi1,GE XuLei1,LI YuTong1,MA JingLong1,LIU XiaoLong1,ZHANG Lu1,SHENG ZhengMing1,2,CHEN LiMing1,LU Xin1,DONG QuanLi1,WANG ZhaoHua1,WEI ZhiYi1&ZHANG Jie1,21beijing national laboratory of{3. matter physics,Institute of physics,Chinese Academy of Sciences,beijing 100190,china 2Key laboratory for Laser Plasmas(Ministry of Education)and Department of physics,Shanghai Jiao Tong University,Shanghai 200240,china beijing national laboratory of{3. matter physics Institute of Physics Chinese Academy of Sciences Beijing China Key laboratory for Laser Plasmas (Ministry of Education) and Department of physics Shanghai Jiao Tong University Shanghai China

Intense femtosecond laser-plasma interactions can produce high power terahertz *** our experiment,the polished copper target was irradiated by a p-polarized laser with intensity of more than 1018 W/cm2 at an incident angle of 67.5 from the target *** THz energy from three dierent detection angles is *** maximum emission is found in the direction at an angle of 45 to the laser backward direction,which is more than one order of magnitude higher than in the other two directions.A simple theoretical model has been established to explain the measurements.

关键词： terahertz emission laser solid interactions angular distribution

Interfacial behaviors of PMMA-PEO block copolymers at the air/water interface

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Science china Chemistry 2005年第6期48卷 567-573页

作者： CHENG Caixia1, JIAO Tifeng2, TANG Rupei1, LIU Minghua2 & XI Fu1 1. State Key laboratory of Polymer physics and Chemistry, Joint laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences,{3. 100080, china 2. CAS Key laboratory of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences,{3. 100080, china State Key laboratory of Polymer physics and Chemistry Joint Laboratory of Polymer Science and Materials Institute of Chemistry Chinese Academy of Sciences Beijing China CAS Key laboratory of Colloid and Interface Science Institute of Chemistry Chinese Academy of Sciences Beijing China

Diblock copolymer of PMMA291-b-PEO114 and triblock copolymer of PMMA120-b- PEO227-b-PMMA120 were synthesized and their interfacial properties at the air-water interface were investigated, where both blocks of polyethylene oxide (PEO) and poly(methyl methacrylate) (PMMA) are surface active but the former is soluble in water while the latter is not. Both the block copolymers could form monolayers with two obvious transition regions. The first transition point is around 10 mN/m, which could be assigned to the pancake-brush change of the PEO chains. The other is around 18 mN/m, which could be ascribed to the condensed packing of PMMA. The surface morphological changes during the compression of the Langmuir monolayers are inves-tigated by using the AFM and SEM methods for the films deposited at different surface pressure or molecular areas. At a lower surface pressure, a typical morphology of PEO-con- taining lipopolymers is observed. Upon compression, sphere-dominant morphologies were observed. While the diblock copolymer is easy to folding, the triblock copolymer is in favor of formation of circular domains through vesiculation.

关键词： PMMA-PEO, block copolymers, monolayer, Langmuir-Blodgett films, AFM.

Phase transition and chemical decomposition of liquid carbon dioxide and nitrogen mixture under extreme conditions

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Chinese physics B 2016年第2期25卷 312-319页

作者：姜晓旭陈冠宇李玉同程新路唐翠明 Institution of Atomic and Molecular physics Sichuan University beijing national laboratory for condensed matter physics Institute of Physics Chinese Academy of Sciences Technology Development Center Central Semiconductor Manufacturing Corporation Department of physics and Mathematics Sichuan University of Science and Engineering

Thermodynamic and chemical properties of liquid carbon dioxide and nitrogen（CO_（2~–）N_2） mixture under the conditions of extremely high densities and temperatures are studied by using quantum molecular dynamic（QMD） simulations based on density functional theory including dispersion corrections（DFT-D）. We present equilibrium properties of liquid mixture for 112 separate density and temperature points, by selecting densities ranging from ρ = 1.80 g/cm^3.to 3.40 g/cm^3.and temperatures from T = 500 K to 8000 K. In the range of our study, the liquid CO_（2~–）N_2 mixture undergoes a continuous transition from molecular to atomic fluid state and liquid polymerization inferred from pair correlation functions（PCFs）and the distribution of various molecular components. The insulator–metal transition is demonstrated by means of the electronic density of states（DOS）.

关键词： liquid CO2-N2 mixture quantum molecular dynamic (QMD) simulations DFT-D phase transi- tion