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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >In situ synthesis and thermoelectric properties of PbTe-graphene nanocomposites by utilizing a facile and novel wet chemical method
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In situ synthesis and thermoelectric properties of PbTe-graphene nanocomposites by utilizing a facile and novel wet chemical method

机译：简便新颖的湿化学法原位合成PbTe-石墨烯纳米复合材料及其热电性能

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In this work, a facile and novel wet chemical method is adopted to synthesize PbTe-graphene nanocomposites, and the thermoelectric properties of the sintered bulk materials are discussed in detail. An intercalative nanostructure is formed by using commercial graphene oxide nanosheets as both the dispersant and the two-dimensional growth template for PbTe nanoparticles in the synthesis process, where PbTe nanoparticles are in situ synthesized and graphene oxide nanosheets are reduced to graphene at the same time. FESEM and TEM measurements indicate that PbTe nanoparticles with sizes of 20-60 nm are uniformly anchored on the surface of graphene, and the nanostructure is retained in the bulk. These novel nanocomposites show enhanced thermoelectric properties as compared to bare PbTe prepared by the same route, as well as to samples prepared by traditional methods. The ultra-high electron mobility of graphene improves the electrical conductivity of the PbTe-graphene nanocomposites, and their conductivity exceeds not only that of bare PbTe but also the samples prepared by the traditional melt-quenching and melt-cooling processing techniques. Moreover, the much-decreased size of the PbTe particles in the bulk material, caused by the intercalative structure, increases the concentration of interfaces which results in the thermal conductivity of the nanocomposite being lower compared with the bare PbTe sample. Therefore, a much higher ZT value of the PbTe-graphene nanocomposites is obtained, reaching a value of 0.7 at 670 K. This is 6 times the value of the bare PbTe sample and a significantly higher ZT than for any n-type PbTe samples prepared by any of the traditional synthesis routes.
机译：在这项工作中，采用一种简便而新颖的湿化学方法来合成PbTe-石墨烯纳米复合材料，并详细讨论了烧结块状材料的热电性能。通过在合成过程中使用市售的氧化石墨烯纳米片作为PbTe纳米粒子的分散剂和二维生长模板来形成插层纳米结构，其中PbTe纳米粒子被原位合成，并且氧化石墨烯纳米片同时被还原为石墨烯。 FESEM和TEM测量表明，尺寸为20-60 nm的PbTe纳米颗粒均匀地锚固在石墨烯的表面，并且纳米结构保留在主体中。与通过相同途径制备的裸PbTe以及通过传统方法制备的样品相比，这些新型纳米复合材料显示出增强的热电性能。石墨烯的超高电子迁移率提高了PbTe-石墨烯纳米复合材料的电导率，其电导率不仅超过裸PbTe，而且超过了通过传统的熔融淬火和熔融冷却加工技术制备的样品。此外，由于插层结构而导致的块状材料中PbTe颗粒尺寸的大大减小，增加了界面的浓度，这导致纳米复合材料的导热率低于裸露的PbTe样品。因此，获得了更高的PbTe-石墨烯纳米复合物ZT值，在670 K下达到0.7。这是裸PbTe样品的6倍，ZT明显高于制备的任何n型PbTe样品通过任何传统的合成途径。

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