Sb2 Te3 纳米结构的制备与表征

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

Synthesis and characterization of Sb2 Te3 nanostructures

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.