期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 570, 期 -, 页码 86-93出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.03.167
关键词
Thermoelectric material; Chemical synthesis; Bismuth telluride; Nanorods; SPS; HPHT
资金
- National Natural Science Foundation of China (NSFC) through the Major Research Plan [91022005]
- NSFC [21171159]
- Innovative Research Groups [21221061]
- HeteroFoaM Center, an Energy Frontier Research Center
- US Department of Energy (DoE), Office of Science, Basic Energy Sciences (BESs) [DE-SC0001061]
We herein report a large-scale hydrothermal synthesis of bismuth telluride nanorods. The effects of different additives, e. g. EDTA ligand, NH4Cl, SDBS and hydrazine hydrate, on the morphology of final product have been systematically investigated. The dimensional sizes of the resultant bismuth telluride alloyed (BTA) nanorods were around 500 nm in length and 20 nm in diameter. Different analytical methods were utilized to determine the chemical composition of the BTA nanorods. HRTEM observation revealed that the nanorods are not homogeneous in terms of composition along the c axis of each nanorod. The formation of such 1D nanorods was proposed to be closely related to the lattice stress caused by the spiral chain along the c axis of trigonal Te during the transition from one dimensional nanowires of Te template to BTA nanorods. To measure the thermoelectric properties of our products, the BTA nanorods were consolidated into bulk pellets by both spark plasma sintering (SPS) or high pressure and high temperature (HPHT) sintering. The corresponding maximal figure of merits (ZT values) for the pellets made by SPS and HPHT are 0.42 and 0.47 at 430 K, respectively. (C) 2013 Elsevier B.V. All rights reserved.
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