Design and Synthesis of Novel Single-Crystalline Hierarchical CdS Nanostructures Generated by Thermal Evaporation Processes

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• 作者：Zai-Xing Yang ; Wei Zhong ; Yu Deng ; Chak-Tong Au ; You-Wei Du
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：June 1, 2011
• 年：2011
• 卷：11
• 期：6
• 页码：2172-2176
• 全文大小：871K
• 年卷期：v.11,no.6(June 1, 2011)
• ISSN：1528-7505

文摘

Through thermal evaporation of a mixture of CdS and graphite powder, we produced a novel hierarchical nanostructure of single-crystalline CdS. It is in the form of cuspidated double headed nanocomb. In the absence of graphite powder, the thermal evaporation of powder CdS alone would result in the formation of CdS nanobelts. The hexagonal wurtzite phase of the CdS nanostructures was verified by XRD, and the single crystallinity confirmed by SAED. As revealed in FESEM and TEM analysis, the obtained hierarchical CdS nanocomb has 2-fold symmetry and the teeth grown perpendicular to the comb trunk are nanospikes of much smaller size. A mechanism for the growth of the hierarchical CdS nanocombs and CdS nanobelts has been described. In the study of optical properties of the CdS nanomaterials, we observed that the photoluminescence peak of CdS nanocombs showed a red-shift of 7 nm in comparison to that of CdS nanobelts.