Systhesizing SnTe nanocrystals leading to thermoelectric performance enhancement via an ultra-fast microwave hydrothermal method
Systhesizing SnTe nanocrystals leading to thermoelectric performance enhancement via an ultra-fast microwave hydrothermal method
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DOI：
10.1016/j.nanoen.2016.08.008
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发表时间：
2016-10-01
期刊：
影响因子：
17.6
通讯作者：
Lu, Guiwu
中科院分区：
文献类型：
--
作者：
Li, Zhiliang;Chen, Yudong;Lu, Guiwu
SnTe是IV-VI半导体中值得注意的一员，SnSe和PbTe是两种具有代表性的热电材料，由于其与PbTe相似的岩盐晶体结构，被认为是一种具有潜在吸引力的热电材料。然而，目前对SnTe的研究受到限制，因为在控制形貌和尺寸方面合成困难，并且由于其高导热性，其热电优值也很低。本研究设计了一种简单、超快速的微波水热法制备从微尺度到纳米尺度可控尺寸的SnTe颗粒。研究了火花等离子烧结制备的SnTe块体材料在较宽温度范围内的热电性能，重点研究了尺寸效应。由于纳米尺寸效应引起的声子散射增强，在803 K时，165纳米尺寸的纳米颗粒在体试样中获得了0.60 W m(-1) K-1的低导热系数。803 K时的ZT最大值提高到0.49，是机械合金化SnTe本体样品的2.3倍左右。(C) 2016 Elsevier Ltd.版权所有。
SnTe is a notable member of the IV-VI semiconductors with SnSe and PbTe as two representative thermoelectric materials, which is considered to be a potentially attractive thermoelectric material due to its similar rock-salt crystal structure to PbTe. However, the current researches on SnTe are limited because of the difficult synthesis in aspect of controlling morphology and size, and its thermoelectric figure of merit is also low due to the high thermal conductivity. In this study, a simple and ultra-fast microwave hydrothermal method was designed to synthesize the SnTe particles with controlled sizes from micro-scale to nano-scale. The thermoelectric properties of the corresponding SnTe bulk materials prepared by spark plasma sintering were investigated in a wide temperature range with a focus on the size effect. Due to the enhanced phonon scattering caused by the nanometer size effect, a low thermal conductivity, 0.60 W m(-1) K-1 at 803 K, was obtained in the bulk specimen using 165-nm-sized nano particles. The corresponding maximum ZT value at 803 K is enhanced to 0.49, which is about 2.3 times that of the SnTe bulk samples using mechanically alloyed powders. (C) 2016 Elsevier Ltd. All rights reserved.