%0 Journal Article
%T Chemical-Vapor-Deposited Graphene as a Thermally Conducting Coating
%J -
%D 2019
%R https://doi.org/10.1021/acsanm.8b02243
%X High Resolution Image Download MS PowerPoint Slide We performed scanning thermal microscopy measurements on single layers of chemical-vapor-deposited (CVD) graphene supported by different substrates, namely, SiO2, Al2O3, and PET using a double-scan technique to remove the contribution to the heat flux through the air and the cantilever. Then, by adopting a simple lumped-elements model, we developed a new method that allows determining, through a multistep numerical analysis, the equivalent thermal properties of thermally conductive coatings of nanometric thickness. In this specific case we found that our CVD graphene is ¡°thermally equivalent¡±, for heat injection perpendicular to the graphene planes, to a coating material of conductivity keff = 2.5 ¡À 0.3 W/m K and thickness teff = 3.5 ¡À 0.3 nm in perfect contact with the substrate. For the SiO2 substrate, we also measured stacks made of 2- and 4-CVD monolayers, and we found that the effective thermal conductivity increases with increasing number of layers and, with a technologically achievable number of layers, is expected to be comparable to that of 1 order of magnitude-thicker metallic thin films. This study provides a powerful method for characterizing the thermal properties of graphene in view of several thermal management applications
%U https://pubs.acs.org/doi/10.1021/acsanm.8b02243