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首页> 外文期刊>Crystal growth & design >High yield Bi_2Te_3 single crystal nanosheets with uniform morphology via a solvothermal synthesis
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High yield Bi_2Te_3 single crystal nanosheets with uniform morphology via a solvothermal synthesis

机译：溶剂热合成高形貌Bi_2Te_3单晶纳米片

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摘要

Hexagonal nanosheet of Bi_2Te_3 single crystals with uniform morphology were facilely synthesized through a high yield solvothermal route at low temperature (180 C). X-ray diffraction, scanning electron microscope, transmission electron microscope, selected area electron diffraction, and high-resolution transmission electron microscope were employed to characterize the products. In this solvothermal process, ethylene glycol (EG) was used as both reducing agent and solvent to simplify the process. The reaction temperature and alkaline environment play important roles in the formation of Bi_2Te_3 single crystals, and the morphology of the products can be influenced by the added surfactants. Nanosheets with uniform morphology were obtained when polyvinyl pyrrolidone (PVP) was used as surfactant. Transport properties of hot pressed bulk samples formed by the as-prepared nanosheets were investigated. Thermal conductivity of the hot pressed nanosheets was greatly reduced by up to 60%, compared to the melt sample, with an enhancement of Seebeck coefficient and a decrease of electrical conductivity.
机译：通过高产率的溶剂热途径在低温（180℃）下容易地合成出具有均匀形态的Bi_2Te_3单晶六方纳米片。使用X射线衍射，扫描电子显微镜，透射电子显微镜，选择区域电子衍射和高分辨率透射电子显微镜来表征产物。在此溶剂热工艺中，乙二醇（EG）既用作还原剂又用作溶剂，以简化工艺。反应温度和碱性环境在Bi_2Te_3单晶的形成中起着重要作用，所添加的表面活性剂会影响产物的形貌。当聚乙烯吡咯烷酮（PVP）用作表面活性剂时，获得具有均匀形态的纳米片。研究了由制备的纳米片形成的热压块状样品的传输性能。与熔融样品相比，热压纳米片的热导率大大降低了多达60％，同时塞贝克系数提高了，电导率降低了。

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