Figure 5From: Unusual surface and edge morphologies, sp2 to sp3 hybridized transformation and electronic damage after Ar+ ion irradiation of few-layer graphene surfacesXPS spectra after Ar+ion irradiation at different energies from 0.25 to 5 keV. The spectrum for the un-irradiated sample is also plotted as a reference. Inset shows the Ar+ ion concentration as a function of irradiation energy.Back to article page