不同表面活性剂制备n型Bi2Te3热电材料

时晓磊; 陆晓芳; 苏莉; 顾士甲; 周蓓莹; 王连军; 江莞

人工晶体学报, 2020, 49 (4): 677, 网络出版: 2020-06-15

不同表面活性剂制备n型Bi2Te3热电材料

Preparation of n-type Bi2Te3 Thermoelectric Materials by Different Surfactants

论文大纲

时晓磊陆晓芳苏莉顾士甲周蓓莹 ^*王连军江莞

作者单位

东华大学材料科学与工程学院，纤维材料改性国家重点实验室，上海 201620

n型Bi2Te3 模板剂热电性能水热法 n-type Bi2Te3 templating agent thermoelectric property hydrothermal method

摘要

分别使用P123(聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物)、PVP(聚乙烯吡咯烷酮)和EDTA(乙二胺四乙酸)为模板剂采用水热法合成n型Bi2Te3热电纳米粉体，通过放电等离子烧结技术(简称SPS)将粉体烧结成块体样品。利用XRD、SEM、ZEM-3以及激光导热仪等对制备的样品进行物相、形貌及热电性能表征。结果显示：三种模板剂制备的Bi2Te3纳米颗粒大部分呈片状，其中PVP制备的纳米片最为规整，EDTA制备的纳米片大小不均一，P123制备的纳米片夹杂有棒状和团聚饼状的形貌；XRD表征显示所制备粉体均为纯Bi2Te3相，没有其它杂质。对块体样品的热电性能研究发现：由于Bi2Te3具有独特的层状结构，会对载流子和声子的传输产生影响，造成所制备块体样品垂直于压力方向的ZT值要大于平行于压力方向的ZT值；采用PVP模板剂制备Bi2Te3样品的热电性能最高，在温度为480 K时，ZT值达到0.33。

Abstract

N-type Bi2Te3 nano-powders were prepared by hydrothermal method, using [P123(polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer), PVP (polyvinylpyrrolidone), and EDTA (ethylene diamine tetraacetic acid)] as template agents. Moreover, the n-type Bi2Te3thermoelectric bulk samples were prepared by Spark Plasma Sintering technology (SPS). The phase, morphology and thermoelectric properties of the prepared samples were characterized by XRD, SEM, ZEM-3 and laser thermal conductivity. The results show that most of the Bi2Te3 nanoparticles prepared by the three template agents are flake-shaped. Among them, the PVP-made nanosheets are the most regular, the EDTA-made nanosheets are not uniform in size, and the P123-made nanosheets are mixed with rod-like and agglomerated spherical shapes; XRD patterns show that the as-prepared nano-powders are all pure Bi2Te3 phase without other impurities. The research on the thermoelectric properties of bulk samples found that:due to the unique layered structure of Bi2Te3, which would affect the carrier and phonon transmission, the ZT value of the prepared bulk sample perpendicular to the pressure direction was larger than that parallel to the pressure direction. The Bi2Te3 sample prepared by the PVP template presented the best thermoelectric performance and the ZT value reached 0.33 at a temperature of 480 K.

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时晓磊, 陆晓芳, 苏莉, 顾士甲, 周蓓莹, 王连军, 江莞. 不同表面活性剂制备n型Bi2Te3热电材料[J]. 人工晶体学报, 2020, 49(4): 677. SHI Xiaolei, LU Xiaofang, SU Li, GU Shijia, ZHOU Beiying, WANG Lianjun, JIANG Wan. Preparation of n-type Bi2Te3 Thermoelectric Materials by Different Surfactants[J]. Journal of Synthetic Crystals, 2020, 49(4): 677.

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