Fabrication, optical and electrical properties of solvethermal reduced graphene oxide/polyimide composites by in situ polymerization

•SRGO/PI composites are effectively prepared by a facile solvothermal reduced approach and in situ polymerization.•SRGO/PI composites exhibit very obvious optical abosorption properties, which could be intensively used in black films.•These SRGO/PI composites also display the outstanding electric conductivity and emissive properties.

Solvothermal reduced graphene oxide (SRGO) suspensions in dimethylacetamide (DMAC) are facilely prepared by a solvothermal process. Then, SRGO/polyimide (PI) composites are efficiently prepared by in situ polymerization and finally cured at 300 °C for 2 h. Optical, dielectric and electrical properties are carefully evaluated by the optical transmission, dielectric constants (ε) and dielectric loss factors, conductivity, etc. The SRGO/PI composite film with 0.5 wt% SRGO sheets exhibits the obvious optical absorption in region of 0.5-2.4 μm and the higher emissivity in region of 6-24 μm. Moreover, the dielectric constants and resistivity of SRGO/PI composites display an obvious decrease from ε = 4.0 to ε = 3.0 and from 1014 to 106 Ω cm, respectively. This approach would supply a potential revolution to improve optical and electrical properties of SRGO/PI composites.

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