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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
- New Chemical Reaction Process of a Bi2Te2.7Se0.3 Nanomaterial for Feasible Optimization in Transport Properties Resulting in Predominant n-Type Thermoelectric Performance
- Kim, Cham; Kim, Chang Eun; Baek, Ju Young; Kim, Dong Hwan; Kim, Jong Tae; Ahn, Ji Hyeon; Lopez, David Humberto; Kim, Taewook; Kim, Hoyoung
- DGIST Authors
- Kim, Cham; Kim, Dong Hwan; Kim, Hoyoung
- Issue Date
- Industrial and Engineering Chemistry Research, 55(19), 5623-5633
- Article Type
- Chemical Reaction Process; Chemical Reactions; Electric Conductivity; Electrical Conductivity; Figure of Merits; High Electrical Conductivity; Low Thermal Conductivity; Nano-Structured Materials; Sintering; Spark Plasma Sintering; Spark Plasma Sintering Process; Synergistic Effect; Thermal Conductivity; Thermo-Electric Performance; Thermo-Electricity; Transport Properties
- 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.
- American Chemical Society
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- Magnet-Controlled Materials Research Group1. Journal Articles
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