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Synthesis of heavily Cu-doped Bi2Te3 nanoparticles and their thermoelectric properties
- Title
- Synthesis of heavily Cu-doped Bi2Te3 nanoparticles and their thermoelectric properties
- Authors
- An, Juhee; Han, Mi-Kyung; Kim, Sung-Jin
- Ewha Authors
- 김성진; 한미경
- SCOPUS Author ID
- 김성진; 한미경
- Issue Date
- 2019
- Journal Title
- JOURNAL OF SOLID STATE CHEMISTRY
- ISSN
- 0022-4596
1095-726X
- Citation
- JOURNAL OF SOLID STATE CHEMISTRY vol. 270, pp. 407 - 412
- Keywords
- Bi2Te3; Nanoparticle; Doping
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Heavily Cu-doped Bi2Te3 nanoparticles were prepared by intercalating copper metal into flower-like Bi2Te3 nanoparticles using the disproportionation redox reaction of Cu(I) salt. The phase, chemical composition, and morphology of the Bi2Te3 nanoflowers were analyzed by X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and scanning electron microscopy (SEM). The synthesized Cu-doped Bi(2)Te(3 )nanopowders were consolidated by spark-plasma sintering into bulk pellets, and the effects of Cu-doping on the transport properties (electrical resistivity, Seebeck coefficient, and thermal conductivity) of these materials were investigated. Superstoichiometric amounts of Cu (up to similar to 28 at%) can be incorporated into flower-like Bi2Te3 nanoparticles, which have large accessible surface area for diffusion of Cu ions. The flower-like morphologies did not change despite high Cu incorporation. Variation in carrier concentration was achieved by changing Cu precursor concentration. Cu-doping in Bi2Te3 can enhance the Seebeck coefficient due to a decrease in carrier concentration, thus the power factors increased compared with that of the un-doped sample. Furthermore, the thermal conductivity of Cu-doped Bi2Te3 is substantially reduced. As a result, Cu-doped Bi2Te3 sample with 15.6 at% Cu exhibited the best thermoelectric performance with a figure of merit of 0.67 at 415 K, which is more than two times higher than that of undoped Bi2Te3 nanopowder.
- DOI
- 10.1016/j.jssc.2018.11.024
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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