Multilayer graphene-silicone nanocomposite films for use in thermal interfaces

Abstract

Flexible graphene-based composite films have gained high importance as thermal interface materials for applications in electro-electronic devices, in order to solve the problem of overheating and consequent degradation of the products.In this research, the results of characterization of the thermal, electrical and mechanical performance of silicone-based nanocomposite films with varying percentages of graphene were presented. Resistivity results were shown to be below 20.6 Ω.cm in the sample with 20% graphene. The mechanical performance of the films showed excellent results, with a Modulus of Elasticity of 19.2 MPa in the tensile test for the best tested formulations. Finally, the thermal analysis performed for a commercial light emitting diodes (LED devices), measuring the junction temperature (Tj) at the interface between the diode base and the cooling platform, showed temperatures around 100ºC at full LED power, i.e., within the range recommended by the device supplier, with the possibility of further improvement. These results indicate that the material developed from graphite/silicone polymer is a promising flexible conductive material for numerous applications in electronics, heat sinks, thermal interfaces and others.