凯发

Owing to the unique thermal transfer property, graphene attracts great attention as heat dissipation material. In this work, a novel composite was fabricated by rolling graphene sheets into vertically aligned graphene film (VAGF) and then penetrating liquid polydimethylsiloxane (PDMS) into it. The ultrahigh thermal conductivity of graphene in the in-plane direction can be fully exploited by vertically alignment. The thermal conductivity of VAGF/ PDMS composite is inversely proportional to the temperature. However,the value is up to 614.85 Wm-1 K-1at room temperature, i.e. an enhancement per wt% of as high as 3329% compared to pure PDMS. Rapid and effective heat-transfer paths formed by vertical graphene sheets are benefit for heat removing.The heat dissipation performance of VAGF/PDMS composite is further confirmed by infrared thermal imaging technology. The temperature of the VAGF/PDMS composite rises fastest under the same heating condition, compared with PDMS and copper. The resulted composite also owns excellent thermal stability and mechanical properties. The results prove that the VAGF/PDMS composite most likely become a good candidate of high performance thermal interfacial materials.