Fig. 5. (a) Dynamic response versus time for the sensor treated at different RTA temperatures and NO2 gas concentrations of 1, 3 and 5 ppm, (b) absolute value of response and recovery change for the sensor treated at different RTA temperatures with the exposure of 1 ppm NO2, and (c) schematic of the Fermi level of pristine graphene and p-doped graphene tuning by the NO2 molecules.
