Influence of the Nanoscale Kirkendall Effect on the Morphology of Copper Indium Disulfide Nanoplatelets Synthesized by Ion Exchange
Influence of the Nanoscale Kirkendall Effect on the Morphology of Copper Indium Disulfide Nanoplatelets Synthesized by Ion Exchange
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DOI：
10.1021/acsnano.5b02427
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发表时间：
2015-07-01
期刊：
影响因子：
17.1
通讯作者：
Buhro, William E.
中科院分区：
文献类型：
--
作者：
Mu, Linjia;Wang, Fudong;Buhro, William E.
CuInS2 纳米晶体通过与模板 Cu2-xS 纳米片和 InX3 [X = 氯化物、碘化物、乙酸盐 (0Ac) 或乙酰丙酮酸盐 (acac)] 进行离子交换来制备。所得纳米晶体的形貌取决于 InX3 前体和反应温度。在 150 摄氏度下与 InCl3 交换产生具有中心孔和厚度变化的 CuInS2 纳米片，而在 200 摄氏度下交换产生完整的 CuInS2 纳米片，其中保留了初始形态。在 150 摄氏度下与 InI3 交换产生 CuInS2 纳米片，其中中心空心更加严重，而在 150 摄氏度下与 In(0Ac)(3) 或 In(acac)(3) 交换产生完整的 CuInS2 纳米片。结果表明，离子交换是通过薄纳米片边缘面发生的。空心和孔的形成是由于纳米级柯肯德尔效应在反应限制范围内作用，导致边缘处的 X- 位移，从而允许 In3+ 插入模板纳米片中。
CuInS2 nanocrystals are prepared by ion exchange with template Cu2-xS nanoplatelets and InX3 [X = chloride, iodide, acetate (0Ac), or acetylacetonate (acac)]. The morphologies of the resultant nanocrystals depend on the InX3 precursor and the reaction temperature. Exchange with InCl3 at 150 degrees C produces CuInS2 nanoplatelets having central holes and thickness variations, whereas the exchange at 200 degrees C produces intact CuInS2 nanoplatelets in which the initial morphology is preserved. Exchange with InI3 at 150 degrees C produces CuInS2 nanoplatelets in which the central hollowing is more extreme, whereas exchange with In(0Ac)(3) or In(acac)(3) at 150 degrees 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- at the edges, to allow insertion of In3+ into the template nanoplatelets.