In situ fabrication and thermoelectric properties of PbTe–polyaniline composite nanostructures
In situ fabrication and thermoelectric properties of PbTe–polyaniline composite nanostructures
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DOI：
10.1007/s11051-010-0043-y
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发表时间：
2011-02
影响因子：
2.5
通讯作者：
Yuanyuan Wang;Kefeng Cai;J. Yin;B. An;Yong Du;Xi Yao
中科院分区：
文献类型：
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作者：
Yuanyuan Wang;Kefeng Cai;J. Yin;B. An;Yong Du;Xi Yao
采用界面聚合法在室温（~293 K）下原位合成了PbTe-聚苯胺（PANi）复合纳米粉体。采用X射线粉末衍射、红外光谱、透射电子显微镜（TEM）和高分辨透射电子显微镜（TEM）分别对粉体的相结构、组成和形貌进行了表征。结果表明，复合粉体由PbTe纳米粒子、PANi/PbTe核壳结构和PbTe/PANi/PbTe三层球形纳米结构组成。提出了PbTe-PANi复合纳米结构的形成机理。在293 ~ 373 K温度范围内测量了复合粉末冷压成丸后的热电性能。随着温度从293 K升高到373 K，复合材料的塞贝克系数从626 μV K− 1降低到578 μV K− 1，电导率从1.9 S m − 1增加到2.2 S m−1。
PbTe–polyaniline (PANi) composite nanopowders were in situ fabricated via an interfacial polymerization method at room temperature (~293 K). The phase structure, composition, and morphology of the powders were characterized by X-ray powder diffraction, infrared spectroscopy, transmission electron microscopy (TEM), and high-resolution TEM, respectively. The results show that the composite nanopowders consist of PbTe nanoparticles, PANi/PbTe core–shell nanostructure, and PbTe/PANi/PbTe three-layer sphere-like nanostructures. Formation mechanism of the PbTe–PANi composite nanostructures was proposed. The thermoelectric properties of the composite powders after being cold pressed into pellets were measured from 293 to 373 K. As the temperature increases from 293 to 373 K, the Seebeck coefficient of the composite decreases from 626 to 578 μV K−1and the electrical conductivity increases from 1.9 to 2.2 S m−1.