Raman spectroscopy investigation of electron beam irradiated graphene

Structural modification of graphene after direct electron beam irradiation (acceleration voltages of 3 kV and 5 kV and exposure doses 200, 400, 800 μC/cm<sup>2</sup>) has been investigated by using micro-Raman spectroscopy. The amplitudes ratio - I<sub>D</sub>/I<sub>G</sub> and I<sub>2D</sub>/I<sub>G</sub> versus exposure doses for each acceleration voltage extracted from Raman spectra acquisitions with red laser (633 nm) are evidencing the increasing degradation of single layer graphene at low exposure doses.