Large-Scale Synthesis and Phase Transformation of CuSe, CuInSe2, and CuInSe2/CuInS2 Core/Shell Nanowire Bundles

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• 作者：Jun Xu ; Chun-Sing Lee ; Yong-Bing Tang ; Xue Chen ; Zhen-Hua Chen ; Wen-Jun Zhang ; Shuit-Tong Lee ; Weixin Zhang ; Zeheng Yang
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：April 27, 2010
• 年：2010
• 卷：4
• 期：4
• 页码：1845-1850
• 全文大小：395K
• 年卷期：0
• ISSN：1936-086X

文摘

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 Cu_2−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.