Solvothermal Synthesis of High-Aspect Ratio Alloy Semiconductor Nanowires: Cd1−xZnxS, a Case Study

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• 作者：Subhajit Biswas^† ; ; Soumitra Kar*^† ; ; Swadeshmukul Santra*^† ; ^‡ ; ^§ ; ; Y. Jompol^† ; ; M. Arif^† ; ; Sa
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：March 5, 2009
• 年：2009
• 卷：113
• 期：9
• 页码：3617-3624
• 全文大小：388K
• 年卷期：v.113,no.9(March 5, 2009)
• ISSN：1932-7455

文摘

High-aspect ratio Cd_1−xZn_xS (x = 0−1) alloy semiconductor nanowires are reported here for the first time using an ethylenediamine (en)-assisted solvothermal approach. The composition of the en−water (en-w) mixed solvent plays a crucial role in determining the morphology and crystalline phase of the alloy nanowires in the middle range of x (i.e., when x approaches 0.5). A phase transformation from hexagonal to cubic was observed for the middle range of x in an en-dominated solvent (en/w, 5:1). Nanowires with hexagonal phases were formed for the entire range of x with increasing water content of the solvent system (en/w, 2:1). The aspect ratio of the nanowires was found to be dependent on the x value as well as solvent composition. Alloy nanowires exhibit photoresponse properties when illuminated under white light. The synthesis technique is modified to synthesize core−shell Cd_1−xZn_xS/ZnS nanowires. Enhancement in photoluminescence efficiency is observed with a ZnS shell over the alloy nanowires.