Abstract
In this chapter, thermoelectric (TE) properties of carbon-based nanomaterials especially graphene, carbon nanotubes (CNT) and their composites have been investigated. The high electrical conductivity of CNT/graphene and low thermal conductivity of other TE materials like Bi2Te3, Cu2Se, Mg2Si, SnSe, etc. and polymer materials help in achieving improved TE properties. But at the same time, the low Seebeck coefficient of carbon nanomaterials has degrading effects on the overall TE properties of material. A comparative study has been done for different carbon-based nanomaterials used as TE materials or in a TE composite. The idea of using carbon-based nanomaterials in TE materials is attractive due to their non-toxic nature, abundance and the particularly extraordinary properties of these nanomaterials, like very high electrical conductivity, modulus, strength, etc. However, high thermal conductivity and low Seebeck coefficient are not desirable and to improve these properties different strategies are used like defect engineering, introducing strain, creating additional interfaces, boundaries, other phonon scattering points, etc. In addition to these strategies, these carbon-based materials can be used with other low thermal conductivity and high Seebeck coefficient materials as composites to utilize their high electrical conductivity and to improve the figure of merit of TE materials.
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