Fig. 6.

Thermal conduction and thermal stability of bioinspired graphene/aramid nanofiber film. a In-plane thermal diffusivity of the film with an increasing graphene loading. b In-plane thermal conductivity. c Tensile strength and elongation of composite film (40%) after heat treatment at different temperatures. d TGA and DTG curves of graphene, ANF film and composite film (40%). e dL/L₀ and coefficients of thermal expansion (CTE) of composite film (40%) and ANF film at different temperatures. f Photographs of composite film (40%) before and during burning, showing nonflammability. g Comparison of infrared thermal images of air, aramid nanofiber (0%) and composite film (40%) as LED heat dissipating substrate. h Temperature evolution curves of hot spot at cross-point (inset) with working time