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Effects of Bi2Se3 nanoparticle inclusions on the microstructure and thermoelectric properties of Bi2Te 3-based nanocomposites

Title
Effects of Bi2Se3 nanoparticle inclusions on the microstructure and thermoelectric properties of Bi2Te 3-based nanocomposites
Authors
Kim H.Han M.-K.Yo C.-H.Lee W.Kim S.-J.
Ewha Authors
김성진한미경
SCOPUS Author ID
김성진scopus; 한미경scopus
Issue Date
2012
Journal Title
Journal of Electronic Materials
ISSN
0361-5235JCR Link
Citation
vol. 41, no. 12, pp. 3411 - 3416
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A series of thermoelectric nanocomposite samples were prepared by integrating Bi2Se3 nanoparticles into a bulk Bi 2Te3 matrix. Primarily, spherical Bi2Se 3 nanoparticles with diameter of ∼30 nm were synthesized by combining bismuth acetate with elemental Te in oleic acid solution. Bi2Te3-based nanocomposite samples were prepared by consolidating the appropriate quantity of Bi2Se3 nanoparticles with the starting elements (Bi and Te) using typical solid-state synthetic reactions. The microstructure and composition of the Bi2Te3-based nanocomposites, as well as the effects of the Bi2Se3 nanoparticles on their thermoelectric properties, are investigated. Transmission electron microscopy observation of the Bi2Te3-based nanocomposites reveals two types of interface between the constituent materials, i.e., coherent and incoherent, depending on the Bi 2Se3 concentration. The Bi2Se3 nanoparticles in the Bi2Te3 matrix act as scattering centers for a wider range of phonon frequencies, thereby reducing the thermal conductivity. As a result, the maximum ZT value of 0.75 is obtained for the Bi2Te3 nanocomposite with 10 wt.% Bi2Se3 nanoparticles at room temperature. It is clear that the reduction in the thermal conductivity plays a central role in the enhancement of the ZT value.© 2012 TMS.
DOI
10.1007/s11664-012-2255-7
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자연과학대학 > 화학·나노과학전공 > Journal papers
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