Influence of the Nanoscale Kirkendall Effect on the Morphology of Copper Indium Disulfide Nanoplatelets Synthesized by Ion Exchange

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• 作者：Linjia Mu ; Fudong Wang ; Bryce Sadtler ; Richard A. Loomis ; William E. Buhro
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：July 28, 2015
• 年：2015
• 卷：9
• 期：7
• 页码：7419-7428
• 全文大小：829K
• ISSN：1936-086X

文摘

CuInS₂ nanocrystals are prepared by ion exchange with template Cu_2鈥?i>xS nanoplatelets and InX₃ [X = chloride, iodide, acetate (OAc), or acetylacetonate (acac)]. The morphologies of the resultant nanocrystals depend on the InX₃ precursor and the reaction temperature. Exchange with InCl₃ at 150 掳C produces CuInS₂ nanoplatelets having central holes and thickness variations, whereas the exchange at 200 掳C produces intact CuInS₂ nanoplatelets in which the initial morphology is preserved. Exchange with InI₃ at 150 掳C produces CuInS₂ nanoplatelets in which the central hollowing is more extreme, whereas exchange with In(OAc)₃ or In(acac)₃ at 150 掳C produces intact CuInS₂ nanoplatelets. The results establish that the ion exchange occurs through the thin nanoplatelet edge facets. The hollowing and hole formation are due to a nanoscale Kirkendall Effect operating in the reaction-limited regime for displacement of X^{鈥?/sup> at the edges, to allow insertion of In3+ into the template nanoplatelets.}