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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。
Taking Sb2Te3, a traditional thermoelectric material with excellent thermoelectric properties, as the research object, Sb2Te3 single crystal nanostructures were prepared by chemical vapor deposition and their growth mechanism was studied. The experimental results show that Sb2Te3 can easily grow into hexagonal nanodisks without catalyst, The orientation of Sb2Te3 is related to its crystal structure and growth mechanism.Sb2Te3 is a triangular structure in which Sb and Te atoms are arranged in a layer along the c-axis and there are adjacent Te Atomic layer, Sb2Te3 grows into flake in the ab plane without catalyst, and the growth direction of Sb2Te3 grows into Sb2Te3 nanowire when the nano-gold is used as the catalyst.