Fig. 1. Morphology of graphene oxide film. (a) Surface morphology; (b) lateral morphology

Fig. 2. Schematic illustration of the graphene oxide by femtosecond laser irradiation

Fig. 3. Evolution of the ablated area of graphene oxide by 1030 nm femtosecond laser irradiation

Fig. 4. Ablated surface morphology of graphene oxide by 1030 nm femtosecond laser irradiation. (a) 5 pulses; (b) 20 pulses; (c) 50 pulses; (d) 60 pulses; (e) 80 pulses; (f) 100 pulses

Fig. 5. Evolution of the ablated area of graphene oxide by 257 nm femtosecond laser irradiation

Fig. 6. Ablated surface morphology of graphene oxide by 257 nm femtosecond laser irradiation. (a) 5 pulses; (b) 20 pulses; (c) 40 pulses; (d) 60 pulses; (e) 80 pulses; (f) 100 pulses

Fig. 7. Surface and side morphology of nanostructures irradiated by 1030 nm and 257 nm laser . (a) Surface morphology irradiated by 1030 nm laser; (b) lateral morphology irradiated by 1030 nm laser; (c) enlarged lateral morphology irradiated by 1030 nm laser; (d) surface morphology irradiated by 257 nm laser; (e) lateral morphology irradiated by 257 nm laser; (f) enlarged lateral morphology irradiated by 257 nm laser

Fig. 8. Raman spectra of the graphene oxide by femtosecond laser irradiation

Fig. 9. Electrochemical impendence spectra of graphene oxide irradiated by 1030 nm and 257 nm femtosecond laser