Epitaxial Growth of Shape-Controlled Bi2Te3−Te Heterogeneous Nanostructures

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• 作者：Wenshou Wang ; James Goebl ; Le He ; Shaul Aloni ; Yongxing Hu ; Liang Zhen ; Yadong Yin
• 刊名：Journal of the American Chemical Society
• 出版年：2010
• 出版时间：December 8, 2010
• 年：2010
• 卷：132
• 期：48
• 页码：17316-17324
• 全文大小：621K
• 年卷期：v.132,no.48(December 8, 2010)
• ISSN：1520-5126

文摘

A one-pot solution process has been devised to synthesize colloidal Bi₂Te₃−Te heterogeneous nanostructures (HNs) that comprise Bi₂Te₃ nanoplates and Te nanorods. By controlling the reaction kinetics, the reaction of TeO₃²⁻ and Bi³⁺ in the presence of hydrazine first produces uniform Te nanorods and then grows Bi₂Te₃ nanoplates on the tips and surfaces of these Te nanorods, forming various shapes including “nails”, “barbells”, “syringes”, and “accordions”. The specific topological arrangement realized arises from the peculiar anisotropic reactivity of the first formed Te nanorods, whose tips are subsequently exploited to seed the heterogeneous nucleation of Bi₂Te₃ as enabled by the similar crystal structure and the small lattice mismatch between Te and Bi₂Te₃. Three important processes, heterogeneous nucleation of Bi₂Te₃ on the tips and/or surface of Te nanorods, homogeneous nucleation of Bi₂Te₃, and the direct reaction of a Bi precursor and Te nanorods to form hollow structures via the Kirkendall Effect, occur under various conditions. The manipulation of these processes provides a robust means for the fine shape control of Bi₂Te₃−Te HNs. It is envisioned that the tailored synthesis of Bi₂Te₃−Te HNs may promise unique opportunities for producing thermoelectric materials with greatly enhanced performance.