Figure 1

Before (a) and after (b) graphene UV irradiation OM diagram at 100 ×, scale bar: 10 μm. (c) Transmittance spectrum of graphene without and with UV irradiation for 20 min. (d) Graphene Raman spectra showing unmodified and UV ozone irradiation time of 5, 10, 20 min. (e) IV curves of graphene for unmodified and UV irradiation at 5, 10, 20 min, respectively. (f) Sheet resistance, carrier mobility, and carrier concentration of graphene for unmodified and UV irradiation at 5, 10, 20 min, respectively.