Figure 4
From: Restoration of thermally reduced graphene oxide by atomic-level selenium doping
Temperature-dependent electron transport properties of rGO and Se-rGO. Temperature-dependent electrical transport properties of (a) rGO and (b) Se-rGO measured between 20 and 300 K in 20-K steps with inset optical images of the four-electrode configurations. The slope of the I–V curves increased concomitantly with temperature, indicating an increase of conductivity with temperature. (c) Temperature dependence of rGO and Se-rGO conductivities obtained from I–V curves and variable-range hopping (VRH) and fluctuation-induced tunneling (FIT) models. rGO and Se-rGO were well-fitted by VRH and FIT models, respectively. (d) Temperature vs σ/σ20 K plots for rGO and Se-rGO. The above curve for Se-rGO is almost flat in the temperature range from 20 to 300 K (1.3-fold increase), indicating that the carrier mobility becomes temperature-independent due to selenium doping, implying mobility restoration.
