摘要
采用简单的水热/溶剂热法合成了纳米结构的Bi_(0.5)Sb_(1.5)Te_3晶粒,通过改变溶剂种类和表面修饰剂的添加量可以实现对Bi_(0.5)Sb_(1.5)Te_3纳米晶体的尺寸和形貌的控制。当表面修饰剂的浓度较小时,合成的Bi_(0.5)-Sb_(1.5)Te_3晶粒只有数十纳米,有望为高性能的纳米结构块体热电材料提供原始粉末。产物的颗粒尺寸减小和片状形貌的获得,可能是生成物的合成速率减缓和表面修饰剂选择性吸附所致。
Nano-crystal Bi0.5Sb1.5Te3 has been synthesized by a simple hydrothermal or solvothermal approach. The nanoerystal size and morphologies can be turned by changing the types of solvent and the amount of surfactant. When the surfactant concentration is small, the as-prepared Bi0.5Sb1.5Te3 crystal grains are only several tens nanometers,which are expected to be the original powder for the nano-structured bulk thermoelectric materials with high performance. The low synthesis rate and the selective adsorption of the surfactant may be the reason for the reduction of the product size and the obtaining of nanoplates.
基金
上海市科委(05JC14065)
国家自然科学青年基金(50701031)
长江学者和创新团队发展计划资助(IRT0739)
