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The influence of CNTs on the thermoelectric properties of a CNT/Bi2Te3 composite
Affiliation:1. Powder Technology Department, Korea Institute of Materials Science, 797 Changwon-daero, Seongsan-gu, Changwon, Gyeongnam 642-831, Republic of Korea;2. Materials Research Center, Samsung Advanced Institute of Technology, San 24, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do, Republic of Korea;3. Division of Advanced Materials Science and Engineering, Pukyong National University, Busan 608-739, Republic of Korea;1. SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Republic of Korea;2. Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Republic of Korea;3. Samsung Advanced Institute of Technology (SAIT), Samsung Electronics, Suwon 443-803, Republic of Korea;4. Department of Nano Applied Engineering, Kangwon National University, Chuncheon 200-701, Republic of Korea;5. Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Sungkyunkwan University, Suwon 440-746, Republic of Korea;6. School of Mechanical Engineering and Samsung-SKKU Graphene Center (SSGC), Sungkyunkwan University, Suwon 440-746, Republic of Korea;1. Korea Institue of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon, Gyeongnam 51508, Republic of Korea;2. Pohang University of Science and Technology, 77 Cheongnam-Ro, Nam-gu, Pohang 37673, Republic of Korea;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;3. State Key Lab of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China;4. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA;1. Department of Engineering Sciences and Mathematics, Luleå University of Technology, 971 87 Luleå, Sweden;2. Department of Functional Nanosystems and High Temperature Materials, NUST MISiS, Moscow, Russian Federation;3. Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstrasse 10, 07743 Jena, Germany;4. Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Lessingstrasse 7a, 07743 Jena, Germany;5. NanoTech Institute, University of Texas at Dallas, Richardson, TX 75080, USA;6. National Research South Ural State University, Chelyabinsk, Russian Federation;7. Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743 Jena, Germany
Abstract:CNT/Bi2Te3 composites were prepared from composite powders in which CNTs were implanted in the Bi2Te3 matrix powders by a novel chemical route. It was found that the fabricated composite had a microstructure of a homogeneous dispersion of CNTs in the Bi2Te3 matrix due to interfacial bonding agents of oxygen atoms attaching to the surface of CNTs. The dimensionless figure of merit (ZT) of the composite shows significantly increased values compared to those of pure binary Bi2Te3 in the temperature range of 298–498 K and a maximum ZT of 0.85 was obtained at 473 K. It is considered that the improved thermoelectric performance of the composite mainly originated from thermal conductivity that was reduced by active phonon-scattering at the CNT/Bi2Te3 interface.
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