多种基底上溅射沉积ZnO薄膜的结构

在玻璃基底踌地基底上用反应式直流磁控溅射法制备了ZnO薄膜。用AES和XRD对薄膜结构和组分进行测试，结果表明，五种基底上生长的ZnO薄膜在不同程度上都具有优良的纵向均匀性、明显的c轴择优取和向较高的结晶度，而硅基底上薄膜的结构普遍优于玻璃基底上沉积薄膜

GaN蓝光材料新型ZnO/Si外延衬底的溅射沉积

采用常规磁控溅射方法，通过优化工艺，在Si(100),Si(111)多种基片上沉积ZnO薄膜。利用透射电镜(TEM)、X射线衍射(XRD)和X射线摇摆曲线(XRC)，对ZnO薄膜的微区形貌、结晶情况、C轴择优取向进行了详细的测试分析。结果表明，所制备的ZnO薄膜具有理想的结构特性，大多数样品测得ZnO(002)晶面XRC的半高宽(FWHM)1°左右，最小值达0.353°，优于目前国内外同类研究的最佳结果2°。并对ZnO/Si(100)与ZnO/Si(111)衬底的结果进行了比较和讨论

Corrosive Electrochemical Behavior of Carbon Steel in Microbiological Medium

硫酸盐还原菌 (SRB)生长代谢 ,溶液pH值从 7.5下降到 5.8,并在碳钢表面形成生物膜 ,改变了生物膜下碳钢表面的微环境 ,促进碳钢点蚀的形成 .清除表面的腐蚀产物后 ,碳钢基体表面为分布不均匀的溃斑 ,发生严重的点蚀行为 .而SRB的活性和生物膜的结构诱发碳钢腐蚀的形成和生长 ,在微生物快速生长过程中出现明显的氢扩散电流峰 ,加剧碳钢的渗氢行为 ,采用电化学阻抗 (EIS)研究了碳钢在微生物腐蚀过程中生物膜的结构与腐蚀相应的变化关系Sulfate_reducing bacteria(SRB)grows and propagates, PH of the solution is dropped from 7.5 to 5.8,and forms the biofilms on carbon steel in culture medium.The micro_environment on the surface of carbon steel is changed under the biofilms,the factors accelerate the formation of the pitting corrosion. When the biofilm on carbon steel is cleaned out,the surface of carbon steel have the non_uniform pitting corrosion. The activity of SRB and the porous structure of biofilms induced the initiation and development of the pitting corrosion of carbon steel.The process of microbiologically induced corrosion(MIC) involves the development of SRB activity,which promotes the permeation of gydrogen into the carbon steel.The relation of the structure of biofilms and corrosion was also studied using electrochemical impedance spectroscopy(EIS).作者联系地址：清华大学核能技术设计研究院,华中科技大学化学系,华中科技大学化学系,华中科技大学化学系,华中科技大学化学系,清华大学核能技术设计研究院 北京100084 ,湖北武汉30074 ,湖北武汉30074 ,湖北武汉30074 ,湖北武汉30074 ,北京100084Author's Address: 1.Institute of Nuclear Energy TechnologyINET,Tsinghua University,Beijing 100084,China; 2.Chem.Dept.,Huazhong University of Science and Technology,Wuhan 4300

在p-Si(100)上溅射法生长ZnO的结构和光学特性

室温下在p-Si(100)上采用直流反应磁控溅射法外延生长了ZnO薄膜。XRD测量表明了ZnO是高度c轴单一取向生长的，XRC测量则表明了ZnO的高质量。在室温下的PL测量中见到了带边发射，其强度与晶体质量有关

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel