Fig. 1 shows the thermal conductivity of the nanocomposite thin films in relation to the graphene content. The work highlights application of a C-Therm TCi Thermal Conductivity Analyzer in characterizing the thermal conductivity of the thin films after they were prepared with spin-coating and other procedures. The thermal conductivity in a thermoelectric material comes from two sources: the electron and hole transporting heat (ke); and the phonons that travel through the lattice (kl). The total thermal conductivity (k) comprises an electronic term (ke) and a lattice term (kl). The PEDOT:PSS thin film has a smaller level of thermal conductivity (0.24 W mK-1) than inorganic nanomaterials (1 W mK-1 to 10 W mK-1) due to its low lattice and electrical thermal conductivity. However, graphene generates a high level of thermal conductivity because of the fast electron mobility (200 000 cm2 V-1 s-1) and high level of lattice thermal conductivity (5.3 x 103 W mK-1), which is phonon-dominated.
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