Figure 6From: Unusual surface and edge morphologies, sp2 to sp3 hybridized transformation and electronic damage after Ar+ ion irradiation of few-layer graphene surfacesXPS C1 s spectra. (a) Un-irradiated, (b) after 0.5 keV Ar+ ion irradiation, (c) after 4 keV Ar+ ion irradiation energy.Back to article page