▎ 摘　　要

In this study, we develop a series of graphene nanosheets(GNs)/carbon nanotubes(CNTs)/copper(Cu) composite film for heat dissipation. Scanning electronic microscopy (SEM), Raman spectroscopy, X-ray photo spectroscopy (XPS), Laser flash and infrared thermal images of composite film are carried out in this study. We discovered that the content of CNTs in composite film plays an important role on heat dissipation performance. Optimized ratio of GNs to CNTs were found to be 6:4. Raman spectra showed that I-D/I-G ratio of GNs was 0.23, and the I-D/I-G ratio would increase to 0.84 by adding CNTs with the ratio of 6:4. Laser flash analysis shows that the thermal conductivity (K) could be enhanced from 520 W/m.K of GNs film to 687 W/m.K of GNs/CNTs composite film. Infrared thermal images also relative the relationship between the microstructure of composite film and heat dissipation performance. These data indicate that as-synthesized graphene nanosheets/CNTs/Cu composite film is a potential candidate for heat dissipation applications. (C) 2019 Elsevier B.V. All rights reserved.