Fig. 3. Temperature-dependent thermal transport characteristics of graphene composites.

a Thermal conductivity of graphene composites in the temperature range of $2\mathrm{K}\le T\le 300\mathrm{K}$ in the log-log scale. The symbols are the experimental data points. The shaded area indicates the experimental uncertainty. b Thermal conductivity of the graphene composites in the low-temperature region, showing the cross-over temperature, $T_c$. c Thermal conductivity of the graphene composites as a function of the filler loading at $2\mathrm{K}$, $T_c~11\mathrm{K}$, and RT. The errors associated with the data for 2 K and 11 K are smaller than the size of the symbols and are not shown. d Specific heat of the graphene composites as a function of the filler loading at constant temperatures of $2\mathrm{K}$ and $300\mathrm{K}$.