Growth and Phase-Transformation Mechanisms of Nanocrystalline CdS in Na2S Solution

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• 作者：Yansong Xiong ; Jing Zhang ; Feng Huang ; Guoqiang Ren ; Weizhen Liu ; Dongsong Li ; Chen Wang ; Zhang Lin
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：June 26, 2008
• 年：2008
• 卷：112
• 期：25
• 页码：9229 - 9233
• 全文大小：811K
• 年卷期：v.112,no.25(June 26, 2008)
• ISSN：1932-7455

文摘

As-synthesized 3.5-nm sphalerite CdS was hydrothermally coarsened in a series of Na₂S solutions at 150 °C, aiming to understand the effect of the Na₂S additive on the growth and phase-transition mechanisms. X-ray diffraction (XRD) data indicate that, with increasing Na₂S concentration, both the growth rate and the ratio of wurtzite CdS increase. Moreover, high-resolution transmission electron microscopy (HRTEM) data reveal that, in contrast to the regular surface nucleation mode in aqueous solution, the new wurtzite phase of CdS in Na₂S solution appears in the interior regions of crystal, and the interfacial nucleation mode greatly promotes the generation of the wurtzite-type structure. The oriented-attachment (OA) mechanism during growth was found to contribute to the unique mode of phase transformation. We propose that the strong interfacial adsorption effect of Na₂S promotes the growth of CdS via the OA mechanism and the OA-mediated phase transformation.