Charge transport mechanism of hydrazine hydrate reduced graphene oxide

Chemically assisted graphene oxide (GO) is synthesised by improved Hummers´ method. It has been further reduced by hydrazine hydrate by hydrothermal method to form reduced GO (rGO). Raman spectra of GO and rGO suggest the formation of D-band and G-band at 1360 and 1590 cm^-1, respectively. Along with D and G modes, 2D and D´ + G´ modes have been observed at 2710 and 2950 cm^-1, respectively. Tuinstra and Koenig relation is used to calculate the relative size of the sp²-carbon domain. Scanning electron micrographs reveal the separation of flakes during reduction. The dc conductivity measurement covers the peculiar study of conduction mechanism of rGO. On reduction, a remarkable increase in the room temperature conductivity (from 4.25 × 10^-10 to1.9 × 10^-2 S/cm) of GO has been observed. The accomplish study of dc conductivity measurement of rGO in the temperature range of 77-400 K is reported. It is explained on the basis of 3D variable range hopping model. The slope of a plot between activation energy and temperature on logarithmic scale is found to be 0.75 which suits well with the theoretical result.