纳米线
材料科学
四方晶系
铟
黄铜矿
壳体(结构)
微晶
纳米技术
离子
化学工程
柯石英
铜
结晶学
光电子学
晶体结构
复合材料
化学
冶金
有机化学
工程类
作者
Jun Xu,Chun‐Sing Lee,Yiming Tang,Xue Chen,Zhenhua Chen,Wenjun Zhang,Shuit‐Tong Lee,Weixin Zhang,Zeheng Yang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2010-03-08
卷期号:4 (4): 1845-1850
被引量:106
摘要
Facile chemical approaches for the controllable synthesis of CuSe, CuInSe2 nanowire, and CuInSe2/CuInS2 core/shell nanocable bundles were developed. Hexagonal CuSe nanowire bundles with lengths up to hundreds of micrometers, consisting of many aligned nanowires with a diameter of about 10−15 nm, were prepared by reacting cubic Cu2−xSe nanowire bundles with a sodium citrate solution at room temperature. The CuSe nanowire bundles were then used as self-sacrificial templates for making bundles of tetragonal chalcopyrite CuInSe2 nanowires by reacting with InCl3 via a solvothermal process. Furthermore, bundles of CuInSe2/CuInS2 core/shell nanocables were obtained by adding sulfur to the reaction system, and the shell thickness of the polycrystalline CuInS2 in the nanocables increased with increasing S/Se molar ratios. It was found that the small radius of copper ions allows their fast outward diffusion from the interior to the surface of nanowires to react with sulfur atoms/anions and indium ions to form a CuInS2 shell. Enhanced optical absorption in the vis−NIR region of CuInSe2/CuInS2 core/shell nanocable bundles is demonstrated, which is considered beneficial for applications in optoelectronic devices and solar energy conversion.
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