Rational design of Bi2Te3 polycrystalline whiskers for thermoelectric applications

Han, Guang and Chen, Zhi Gang ORCID: https://orcid.org/0000-0002-9309-7993 and Yang, Lei and Hong, Min ORCID: https://orcid.org/0000-0002-6469-9194 and Drennan, John and Zou, Jin (2015) Rational design of Bi2Te3 polycrystalline whiskers for thermoelectric applications. ACS Applied Materials and Interfaces, 7 (1). pp. 989-995. ISSN 1944-8244


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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 21 Jun 2017 05:03
Last Modified: 21 Jun 2017 05:03
Uncontrolled Keywords: Bi2Te3; chemical transformation; In2Te3; interface; polycrystalline whisker; thermoelectric; chemical transformations; high electrical conductivity; one-dimensional morphologies; polycrystalline; polycrystalline microstructure; reduction of thermal conductivity; thermoelectric application; Others, incl. Bismuth, Boron, Cadmium, Cobalt, Mercury, Niobium, Selenium, Silicon, Tellurium; thermoelectric energy;
Fields of Research (2008): 09 Engineering > 0904 Chemical Engineering > 090499 Chemical Engineering not elsewhere classified
Fields of Research (2020): 40 ENGINEERING > 4004 Chemical engineering > 400499 Chemical engineering not elsewhere classified
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: https://doi.org/10.1021/am5078528
URI: http://eprints.usq.edu.au/id/eprint/31688

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