Ambient scalable synthesis of surfactant-free thermoelectric CuAgSe nanoparticles with reversible metallic-n-p conductivity transition

Han, Chao, Sun, Qiao, Cheng, Zhen Xiang, Wang, Jian Li, Li, Zhen, Lu, Gao Qing (Max) and Dou, Shi Xue (2014) Ambient scalable synthesis of surfactant-free thermoelectric CuAgSe nanoparticles with reversible metallic-n-p conductivity transition. Journal of the American Chemical Society, 136 50: 17626-17633. doi:10.1021/ja510433j


Author Han, Chao
Sun, Qiao
Cheng, Zhen Xiang
Wang, Jian Li
Li, Zhen
Lu, Gao Qing (Max)
Dou, Shi Xue
Title Ambient scalable synthesis of surfactant-free thermoelectric CuAgSe nanoparticles with reversible metallic-n-p conductivity transition
Formatted title
Ambient scalable synthesis of surfactant-free thermoelectric CuAgSe nanoparticles with reversible metallic-n-p conductivity transition
Journal name Journal of the American Chemical Society   Check publisher's open access policy
ISSN 1520-5126
0002-7863
Publication date 2014-12-17
Year available 2014
Sub-type Article (original research)
DOI 10.1021/ja510433j
Open Access Status
Volume 136
Issue 50
Start page 17626
End page 17633
Total pages 8
Place of publication Washington DC United States
Publisher American Chemical Society
Collection year 2015
Language eng
Abstract Surfactant-free CuAgSe nanoparticles were successfully synthesized on a large scale within a short reaction time via a simple environmentally friendly aqueous approach under room temperature. The nanopowders obtained were consolidated into pellets for investigation of their thermoelectric properties between 3 and 623 K. The pellets show strong metallic characteristics below 60 K and turn into an n-type semiconductor with increasing temperature, accompanied by changes in the crystal structure (i.e., from the pure tetragonal phase into a mixture of tetragonal and orthorhombic phases), the electrical conductivity, the Seebeck coefficient, and the thermal conductivity, which leads to a figure of merit (ZT) of 0.42 at 323 K. The pellets show further interesting temperature-dependent transition from n-type into p-type in electrical conductivity arising from phase transition (i.e., from the mixture phases into cubic phase), evidenced by the change of the Seebeck coefficient from −28 μV/K into 226 μV/K at 467 K. The ZT value increased with increasing temperature after the phase transition and reached 0.9 at 623 K. The sintered CuAgSe pellets also display excellent stability, and there is no obvious change observed after 5 cycles of consecutive measurements. Our results demonstrate the potential of CuAgSe to simultaneously serve (at different temperatures) as both an n-type and a p-type thermoelectric material.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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