Electrical and optical properties of graphene oxide modified by nitrogen and methane plasma

摘要

The current-voltage (I-V) characteristic and photoresponse of partially reduced graphene oxide (rGO) treated with nitrogen and methane plasmas have been studied. Measurements of I-V characteristics showed that the illumination (incandescent lamp) of samples after plasma exposure leads to the appearance of a bend in the initially linear characteristic. The difference in the value of the currents with the illumination turned on and off was up to 100 μA at a voltage of ±10 V. The relaxation time of the process is about 1 s. The observed effect depends on the plasma processing conditions, as well as on the thickness of the films. The largest values of the photoresponse was observed at thicknesses of GO films from 20 nm to 60-80 nm.