Rational design of Bi2Te3 polycrystalline whiskers for thermoelectric applications

Han, Guang, Chen, Zhi-gang, Yang, Lei, Hong, Min, Drennan, John and Zou, Jin (2015) Rational design of Bi2Te3 polycrystalline whiskers for thermoelectric applications. ACS Applied Materials and Interfaces, 7 1: 989-995. doi:10.1021/am5078528


Author Han, Guang
Chen, Zhi-gang
Yang, Lei
Hong, Min
Drennan, John
Zou, Jin
Title Rational design of Bi2Te3 polycrystalline whiskers for thermoelectric applications
Formatted title
Rational design of Bi2Te3 polycrystalline whiskers for thermoelectric applications
Journal name ACS Applied Materials and Interfaces   Check publisher's open access policy
ISSN 1944-8244
1944-8252
Publication date 2015-01
Year available 2014
Sub-type Article (original research)
DOI 10.1021/am5078528
Open Access Status
Volume 7
Issue 1
Start page 989
End page 995
Total pages 7
Place of publication Washington, United States
Publisher American Chemical Society
Collection year 2015
Language eng
Formatted abstract
Bi2Te3 polycrystalline whiskers consisting of interconnected nanoplates have been synthesized through chemical transformation from In2Te3 polycrystalline whisker templates assembled by nanoparticles. The synthesized Bi2Te3 whiskers preserve the original one-dimensional morphology of the In2Te3, while the In2Te3 nanoparticles can be transformed into the Bi2Te3 thin nanoplates, accompanied by the formation of high-density interfaces between nanoplates. The hot-pressed nanostructures consolidated from Bi2Te3 polycrystalline whiskers at 400 °C demonstrate a promising figure of merit (ZT) of 0.71 at 400 K, which can be attributed to their low thermal conductivity and relatively high electrical conductivity. The small nanoparticles inherited from the polycrystalline whiskers and high-density nanoparticle interfaces in the hot-pressed nanostructures contribute to the significant reduction of thermal conductivity. This study provides a rational chemical transformation approach to design and synthesize polycrystalline microstructures for enhanced thermoelectric performances.
Keyword Bi2Te3
Chemical transformation
Thermoelectric
Polycrystalline whisker
Interface
In2Te3
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 12 December 2014.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
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Created: Mon, 02 Feb 2015, 15:31:09 EST by Lei Yang on behalf of School of Mechanical and Mining Engineering