Wang Yongqiang, Wang Guozhong, Wang Hongqiang, Tang Chunjuan, Li Jie, Zhang Lide
Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, PO. Box 1129, Hefei 230031, People's Republic of China.
J Nanosci Nanotechnol. 2009 Aug;9(8):4820-5. doi: 10.1166/jnn.2009.1276.
Serial semiconductors core-shell and hollow sphere structures were prepared by using silica colloidal spheres as template in alkaline solution. This method presented in this paper involves mainly two steps with metal ions stored into surface layer of silica colloidal spheres in alkaline condition in the first step, followed metal ions reacted with thioacetamide to form semiconductor shell under microwave heating in a short-time. Cadmium ions were used as an example to illustrate the synthesis process. The electron microscopy results suggested that CdS core-shell structure and hollow spheres with complete and uniform shell were successfully synthesized, and the thickness of shell can be controlled in a certain range precisely. The mechanism of this method was discussed in detail. In addition, complex peanut hollow structure was synthesized by using this method, which indicated that this method might be extended to synthesize desired morphology with corresponding silica template. This novel method provides an avenue to synthesize uniform different semiconductor core-shell structure and hollow spheres with controllable morphology and shell thickness.
以二氧化硅胶体球为模板，在碱性溶液中制备了系列半导体核壳和空心球结构。本文提出的该方法主要包括两个步骤：第一步，在碱性条件下将金属离子储存到二氧化硅胶体球的表面层；第二步，金属离子在微波加热下与硫代乙酰胺反应，在短时间内形成半导体壳层。以镉离子为例说明了合成过程。电子显微镜结果表明，成功合成了具有完整且均匀壳层的硫化镉核壳结构和空心球，并且壳层厚度可以在一定范围内精确控制。详细讨论了该方法的机理。此外，利用该方法合成了复杂的花生形空心结构，这表明该方法可能扩展到利用相应的二氧化硅模板合成所需的形态。这种新方法为合成具有可控形态和壳层厚度的均匀不同半导体核壳结构和空心球提供了一条途径。
