TY - JOUR
T1 - Synthesis of heavily Cu-doped Bi2Te3 nanoparticles and their thermoelectric properties
AU - An, Juhee
AU - Han, Mi Kyung
AU - Kim, Sung Jin
N1 - Funding Information:
This research was supported by Nano Material Technology Development Program through the National Research Foundation of Korea (NRFNRF-2015R1A5A1036133).
Funding Information:
This research was supported by Nano Material Technology Development Program through the National Research Foundation of Korea ( NRFNRF-2015R1A5A1036133 ).
Publisher Copyright:
© 2018
PY - 2019/2
Y1 - 2019/2
N2 - 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 Bi2Te3 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 ∼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.
AB - 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 Bi2Te3 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 ∼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.
KW - BiTe
KW - Doping
KW - Nanoparticle
UR - http://www.scopus.com/inward/record.url?scp=85058009376&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2018.11.024
DO - 10.1016/j.jssc.2018.11.024
M3 - Article
AN - SCOPUS:85058009376
SN - 0022-4596
VL - 270
SP - 407
EP - 412
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
ER -