Читать книгу Metal Oxide Nanocomposites - Группа авторов - Страница 86

Owing to the fundamental concept that thermal conductivity of any material (say bulk or nanomaterial) is directed by the influence of the lattice vibrations, i.e. phonons [53]. The diverse carbon allotropes, namely, 3D: graphite, diamond, and 1D: carbon nanotubes, have presented greater thermal conductivity characteristics owed to witnessed strong covalent bonds in their structure and phonon scattering processes. Formerly 1D: carbon nanotubes are recognized for their utmost thermal conductivity characteristics at room temperature. However, these agonize from large thermal contact resistance [54]. In recent times, the maximum room temperature thermal conductivity acquired was up to ~5000 W/mK for the single-layered graphene nanostructure, which has been described. While, for supported graphene, the maximum thermal conductivity, observed is ~600 W/mK, globally recognizing graphene as an outstanding material in numerous polymer matrix to augment heat transport mechanistic [55]. Additionally, there are two major factors which affect the thermal conductivity of graphene, namely, defect-edge scattering processes and isotopic doping, as these factors are unfavourable due to phonon scattering losses [53].