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Optimization of thermoelectric properties of carbon nanotube veils by defect engineering.
Zeng, Chongyang; Stenier, Pietro; Chen, Kan; Wan, Kening; Dong, Ming; Li, Suwei; Kocabas, Coskun; Reece, Michael J; Papageorgiou, Dimitrios G; Volkov, Alexey N; Zhang, Han; Bilotti, Emiliano.
Afiliación
  • Zeng C; Department of Aeronautics, Imperial College London, Exhibition Road, London, SW7 2AZ, UK. e.bilotti@imperial.ac.uk.
  • Stenier P; School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK.
  • Chen K; Department of Materials, University of Manchester, Manchester, M13 9PL, UK.
  • Wan K; National Graphene Institute, University of Manchester, M13 9PL, UK.
  • Dong M; School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK.
  • Li S; School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK.
  • Kocabas C; School of Physical and Chemical Sciences, Queen Mary University of London, London, E1 4NS, UK.
  • Reece MJ; School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK.
  • Papageorgiou DG; Department of Materials, University of Manchester, Manchester, M13 9PL, UK.
  • Volkov AN; National Graphene Institute, University of Manchester, M13 9PL, UK.
  • Zhang H; Henry Royce Institute for Advanced Materials, University of Manchester, Manchester, M13 9PL, UK.
  • Bilotti E; School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK.
Mater Horiz ; 10(9): 3601-3609, 2023 Aug 29.
Article en En | MEDLINE | ID: mdl-37323029
Carbon nanotubes (CNTs), with their combination of excellent electrical conductivity, Seebeck coefficient, mechanical robustness and environmental stability are highly desired as thermoelectric (TE) materials for a wide range of fields including Internet of Things, health monitoring and environmental remediation solutions. However, their high thermal conductivity (κ) is an obstacle to practical TE applications. Herein, we present a novel method to reduce the κ of CNT veils, by introducing defects, while preserving their Seebeck coefficient and electrical conductivity. Solid-state drawing of a CNT veil embedded within two polycarbonate films generates CNT veil fragments of reducing size with increasing draw ratio. A successive heat treatment, at above the polycarbonate glass-to-rubber transition temperature, spontaneously reconnects the CNT veils fragments electrically but not thermally. Stretching to a draw ratio of 1.5 and heat repairing at 170 °C leads to a dramatic 3.5-fold decrease in κ (from 46 to 13 W m-1 K-1), in contrast with a decrease in electrical conductivity of only 26% and an increase in Seebeck coefficient of 10%. To clarify the mechanism of reduction in thermal conductivity, a large-scale mesoscopic simulation of CNT veils under uniaxial stretching has also been used. This work shows that defect engineering can be a valuable strategy to optimize TE properties of CNT veils and, potentially, other thermoelectric materials.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Mater Horiz Año: 2023 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Mater Horiz Año: 2023 Tipo del documento: Article Pais de publicación: Reino Unido