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New Chemical Reaction Process of a Bi2Te2.7Se0.3 Nanomaterial for Feasible Optimization in Transport Properties Resulting in Predominant n-Type Thermoelectric Performance

Title
New Chemical Reaction Process of a Bi2Te2.7Se0.3 Nanomaterial for Feasible Optimization in Transport Properties Resulting in Predominant n-Type Thermoelectric Performance
Authors
Kim, ChamKim, Chang EunBaek, Ju YoungKim, Dong HwanKim, Jong TaeAhn, Ji HyeonLopez, David HumbertoKim, TaewookKim, Hoyoung
DGIST Authors
Kim, ChamKim, Dong HwanKim, Hoyoung
Issue Date
2016-05-18
Citation
Industrial and Engineering Chemistry Research, 55(19), 5623-5633
Type
Article
Article Type
Article
Keywords
Chemical Reaction ProcessChemical ReactionsElectric ConductivityElectrical ConductivityFigure of MeritsHigh Electrical ConductivityLow Thermal ConductivityNano-Structured MaterialsSinteringSpark Plasma SinteringSpark Plasma Sintering ProcessSynergistic EffectThermal ConductivityThermo-Electric PerformanceThermo-ElectricityTransport Properties
ISSN
0888-5885
Abstract
Various chemical reaction processes have been adopted to synthesize Bi2Te3 thermoelectric nanomaterials for achieving remarkably low thermal conductivities, but chemical contaminations were usually pointed out as flaws, severely deteriorating electrical conductivities. We devised a novel water-based chemical reaction process for a Bi2Te2.7Se0.3 nanocompound in which the possibility for chemical contaminations was reduced. We successfully synthesized a small and highly distributed Bi2Te2.7Se0.3 nanocompound with high purity and adequately packed it via a spark plasma sintering process to produce a nanobulk structure. The resulting nanobulk specimen exhibited a physical density as high as the theoretical one with highly distributed nanograins; thus, we were able to obtain remarkably high electrical conductivity while maintaining thermal conductivity as low as possible. The synergistic effect was greatly induced between the transport properties; thus, the highest reported figure of merit value was achieved for n-type Bi2Te3 in the bulk phase. © 2016 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/5104
DOI
10.1021/acs.iecr.6b00933
Publisher
American Chemical Society
Related Researcher
Files:
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Collection:
Magnet-Controlled Materials Research Group1. Journal Articles


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