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Na-doping effects on thermoelectric properties of Cu2-xSe nanoplates

Title
Na-doping effects on thermoelectric properties of Cu2-xSe nanoplates
Authors
Jin Y.Han M.-K.Kim S.-J.
Ewha Authors
김성진한미경
SCOPUS Author ID
김성진scopus; 한미경scopus
Issue Date
2017
Journal Title
Applied Sciences (Switzerland)
ISSN
2076-3417JCR Link
Citation
vol. 8, no. 1
Keywords
Cu2-xSeDopingThermoelectric properties
Publisher
MDPI AG
Indexed
SCIE; SCOPUS scopus
Abstract
For this work, a β-phase Cu2-xSe nanowire and nanoplate, and a Na-doped Cu2-xSe nanoplate were successfully synthesized using solution syntheses. The morphologies of the Cu2-xSe nanowire and nanoplate could be easily controlled by changing the synthetic condition. The Na-doped Cu2-xSe nanoplate was prepared by a simple treatment of the Cu2-xSe nanoplate with a sodium hydroxide-ethylene glycol solution. The nanopowders were then consolidated to bulk materials using spark plasma sintering (SPS). The phase structure and the microstructure of all of the samples were checked using X-ray diffraction (XRD), high-resolution transmission electron microscope (HR-TEM), and scanning electron microscope (SEM) analyses. The thermoelectric transport properties, such as the electrical conductivity, Seebeck coefficient, carrier concentration, carrier mobility, and thermal conductivity, were measured at temperature ranges from 323 to 673 K. The results show that Na played two important roles: one is reducing the carrier concentration, thereby improving the Seebeck coefficient, the other is reducing the thermal conductivity. Overall, the maximum thermoelectric figure of merit (ZT) of 0.24 was achieved at 673 K in the Na-doped Cu2-xSe nanoplate. © 2017 by the authors.
DOI
10.3390/app8010012
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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