Thermal Annealing of Exfoliated Graphene

Figure 2

AFM topographic images (top) and the corresponding Raman spectra (bottom) of graphene M1. (a) Before annealing; (b) annealing at 300°C in vacuum of 5 mbar; (c) annealing at 400°C in vacuum of 5 mbar; (d) annealing at 400°C in N₂/H₂ of 50 mbar. Scale bars are 300 nm in length (colors online).

(a)

(b)

(c)

(d)