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Thermoelectric Properties of Reduced Graphene Oxide/Bi2Te3 Nanocomposites
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Thermoelectric Properties of Carbon Nanotubes

Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan
Department of Physics, Tohoku University, Sendai 980-8578, Japan
Research Center for Physics, Indonesian Institute of Sciences (LIPI), Tangerang Selatan 15314, Indonesia
Author to whom correspondence should be addressed.
Energies 2019, 12(23), 4561;
Received: 11 November 2019 / Revised: 25 November 2019 / Accepted: 27 November 2019 / Published: 29 November 2019
Thermoelectric (TE) material is a class of materials that can convert heat to electrical energy directly in a solid-state-device without any moving parts and that is environmentally friendly. The study and development of TE materials have grown quickly in the past decade. However, their development goes slowly by the lack of cheap TE materials with high Seebeck coefficient and good electrical conductivity. Carbon nanotubes (CNTs) are particularly attractive as TE materials because of at least three reasons: (1) CNTs possess various band gaps depending on their structure, (2) CNTs represent unique one-dimensional carbon materials which naturally satisfies the conditions of quantum confinement effect to enhance the TE efficiency and (3) CNTs provide us with a platform for developing lightweight and flexible TE devices due to their mechanical properties. The TE power factor is reported to reach 700–1000 μ W / m K 2 for both p-type and n-type CNTs when purified to contain only doped semiconducting CNT species. Therefore, CNTs are promising for a variety of TE applications in which the heat source is unlimited, such as waste heat or solar heat although their figure of merit Z T is still modest (0.05 at 300 K). In this paper, we review in detail from the basic concept of TE field to the fundamental TE properties of CNTs, as well as their applications. Furthermore, the strategies are discussed to improve the TE properties of CNTs. Finally, we give our perspectives on the tremendous potential of CNTs-based TE materials and composites. View Full-Text
Keywords: carbon nanotubes; thermoelectric materials; low-dimensional materials carbon nanotubes; thermoelectric materials; low-dimensional materials
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MDPI and ACS Style

T. Hung, N.; R. T. Nugraha, A.; Saito, R. Thermoelectric Properties of Carbon Nanotubes. Energies 2019, 12, 4561.

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