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低维Bi_2Te_3热电材料的制备与性能研究
引用本文:赵晴,王寅岗.低维Bi_2Te_3热电材料的制备与性能研究[J].电子元件与材料,2010,29(6).
作者姓名:赵晴  王寅岗
作者单位:南京航空航天大学,材料科学与技术学院,江苏,南京,210016
摘    要:用溶剂热法制备了直径在100nm以内的一维针状及厚20~30nm、长几微米的二维花朵状Bi2Te3热电材料,分析了不同形貌产物的生长机理,并对其热电性能进行了比较。结果表明,添加剂的分子结构对产物形貌起决定性作用。不同形貌产物的热电性能随温度变化的机制不同,一维纳米结构Bi2Te3产物的功率因子随温度升高而增加,最大值为143.1μΩ·m–1K–2。而二维纳米结构的Bi2Te3产物虽然在室温附近有较大的Seebeck系数,约100μV/K,但由于其电导率较低,功率因子在较宽的温度范围内保持在23μΩ·m–1K–2左右。

关 键 词:低维热电材料  Bi2Te3  溶剂热法  表面活性剂

Study on synthesis and performance of low-dimensional structured Bi2Te3 thermoelectric materials
ZHAO Qing,WANG Yingang.Study on synthesis and performance of low-dimensional structured Bi2Te3 thermoelectric materials[J].Electronic Components & Materials,2010,29(6).
Authors:ZHAO Qing  WANG Yingang
Abstract:Needle-shaped Bi2Te3 with diameters less than 100 nm and flower-like Bi2Te3 with a thickness of 20~30 nm and length of a few microns were obtained through a solvothermal route. The mechanisms of crystal growth were discussed, and the thermoelectric properties were compared. The results show that the molecular structure of the additive plays a key role in the formation of the final morphologies. The power factor of the one-dimensional nanostructured Bi2Te3 increases with temperature and the highest value is 143.1 μ?·m–1K–2. Although the two-dimensional nanostructured Bi2Te3 has a higher Seebeck coefficient of about 100 μV/K at near room temperature, it’s power factor maintains at about 23 μ?·m–1K–2 in a wider range of temperatures for its low conductivity.
Keywords:Bi2Te3
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