Solvothermal synthesis and growth mechanism of Ag and Sb co-doped PbTe heterogeneous thermoelectric nanorods and nanocubes
Solvothermal synthesis and growth mechanism of Ag and Sb co-doped PbTe heterogeneous thermoelectric nanorods and nanocubes
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DOI：
10.1016/j.matchemphys.2012.01.011
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发表时间：
2012-03
影响因子：
4.6
通讯作者：
Jing Liu;Xiaoling Wang;L. Peng
中科院分区：
文献类型：
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作者：
Jing Liu;Xiaoling Wang;L. Peng
纳米结构可以通过增加声子散射和态密度来显著提高热电性能。本研究以廉价化学试剂为原料，十六烷基三甲基溴化铵（CTAB）为表面活性剂，采用简单的一锅溶剂热法制备了具有纳米棒和纳米立方异质结构的AgPb18SbTe20（LAST-18）粉体。结果表明，CTAB有利于纳米棒在{100}面或沿高表面能的[100]方向生长，对纳米棒的形成至关重要。然而，在相同条件下，如果不使用表面活性剂或质量相当的SDBS，则粉末具有纳米颗粒的特征。此外，热压块状LAST-18具有较高的塞贝克系数。在高温范围内获得了%的非均相纳米粉体。
Nanostructuring may contribute to distinct enhancement in thermoelectric (TE) performance via increasing the phonon scattering and density of states. In the present study, AgPb18SbTe20(LAST-18) powders with a heterostructure of nanorods and nanocubes are synthesized by a facile one-pot solvothermal method using cheap chemical reagent as starting materials and cetyltrimethyl ammonium bromide (CTAB) as a surfactant. The results show that CTAB is crucial for the formation of nanorods owing to the preferential growth on the {100} faces or along the [100] direction with high surface energy. However, the powders are characterized by nanoparticles in case no surfactant or mass equivalent SDBS are used under the same condition. In addition, a relatively high Seebeck coefficient of the hot-pressed bulk LAST-18 with 5vol.% heterogeneous nanopowders was obtained at high temperature range.