Abstract
The effect of laser irradiation on few-layer graphene in air was investigated by Raman spectroscopy. The irradiation results in an increase of D band intensity and a concomitant drop in 2D band intensity. Furthermore, both frequencies of G and 2D bands increase. For bilayer and trilayer graphenes, the shape of the 2D band is also changed after the irradiation. Namely, the high-frequency components decrease. From these results, it is suggested that the laser irradiation in air leads to the thermal oxidation with the hole doping and the change in the stacking sequence in the decomposed few-layer graphene with smaller size.
