中文摘要：

以室温热电性能优异的传统热电材料Sb2Te3为研究对象,利用化学气相沉积法制备Sb2Te3单晶纳米结构,并研究其生长机理.实验结果表明,不加催化剂时Sb2Te3易生长成六方纳米盘,在金催化剂条件下定向生长成纳米线.Sb2Te3的形貌与其晶体结构和生长机理有关.Sb2Te3为三角结构,Sb和Te原子沿c轴方向成层状排列,且存在由vonder Waals力连接的相邻Te原子层,因此不加催化剂时Sb2Te3在ab面内择优生长成片状.采用纳米金作为催化剂时,从金液滴中析出的Sb2Te3的生长方向受到限制,从而生长成Sb2Te3纳米线。

英文摘要：

Single-crystalline Sb2Te3 nanostructures,of which the bulk is one of the best thermoelectric materials at room temperature,are synthesized by chemical vapor deposition.The composition,crystal structure,and growth mechanism of the sample are investigated.According to our experimental results,Sb2Te3 normally grows into hexagonal nanoplates without using catalyst,but single-crystalline nanowires can be fabricated with Au nanoparticles as the catalyst.The growth mechanism of Sb2Te3 nanostructures is closely related to its anisotropic crystal structure.Sb2Te3 has a rhombohedral structure,which exhibits a layered anisotropy with the Te and Sb atom layers arranged along the c-axis.Moreover,there are two adjacent Te layers connected by van der Waals bonds.Therefore,Sb2Te3 prefers to grow into hexagonal plates in the ab-plane.When Au nanoparticles are used as the catalyst,the growth direction of the precipitated Sb2Te3 is restricted,leading to the formation of Sb2Te3 nanowires.