Sb_2Te_3纳米结构的制备与表征  

Synthesis and characterization of Sb_2Te_3 nanostructures

作　　者：张帆[1,2] 朱航天[1,2] 骆军[1] 梁敬魁[1] 饶光辉[1] 刘泉林[2] 

机构地区：[1]中国科学院物理研究所北京凝聚态物理国家实验室,北京100190 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《物理学报》2010年第10期7232-7238,共7页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2007CB925003);国家自然科学基金重点项目(批准号:50831002);教育部科学技术研究重大项目(批准号:309006)资助的课题~~

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。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.

关 键 词：热电材料 Sb2Te3 纳米结构 化学气相沉积 

分 类 号：TB383.1[一般工业技术—材料科学与工程]