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Formation of Cu nanoparticles in layered Bi2Te3 and their effect on ZT enhancement

Title
Formation of Cu nanoparticles in layered Bi2Te3 and their effect on ZT enhancement
Authors
Han M.-K.Ahn K.Kim H.Rhyee J.-S.Kim S.-J.
Ewha Authors
김성진한미경
SCOPUS Author ID
김성진scopus; 한미경scopus
Issue Date
2011
Journal Title
Journal of Materials Chemistry
ISSN
0959-9428JCR Link
Citation
vol. 21, no. 30, pp. 11365 - 11370
Indexed
SCOPUS WOS scopus
Abstract
Compounds of CuxBi2Te3 (0 ≤ x ≤ 0.1) were studied to measure the effect of Cu intercalation on their thermoelectric properties. HR-TEM images of freshly fractured surfaces of Cu 0.07Bi2Te3 showed that Cu nanoparticles formed in the van der Waals gaps between Te layers in Bi2Te3. Such nanoparticles acted as electron donors, changing the native p-type character of Bi2Te3 to n-type. They also acted as phonon scatters, reducing thermal conductivity. Cu0.07Bi2Te 3 had high electrical conductivity of 681 S cm-1 and Seebeck coefficient of -236 μV K-1 with low thermal conductivity of 1.0 W m-1 K-1, thus enhancing the figure of merit, ZT, to 1.15 at approximately 300 K. The intercalation of metal nanoparticles between Te layers in Bi2Te3 is a promising strategy for the preparation of highly efficient n-type thermoelectric materials. © 2011 The Royal Society of Chemistry.
DOI
10.1039/c1jm10163c
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자연과학대학 > 화학·나노과학전공 > Journal papers
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