Formation of Graphene Features from Direct Laser-Induced Reduction of Graphite Oxide

Graphene features are produced via continuous wave (532 nm) or pulsed (532 and 355 nm) laser excitation of graphite oxide. Micro-Raman spectroscopy of these laser irradiated areas reveals D and G bands on the edges and the 2D band characteristic of graphene in the central laser irradiated zones. I-D/I-2D ratios vary with laser power and background gas. An I-D/I-2D ratio of similar to 0.17 is obtained using continuous wave excitation in a N-2 background, indicating a dominance of graphene optical signatures. The I-D/I-G ratio obtained for the same region indicates a particle size or interdefect distance of similar to 40 nm, This technique could be useful for laser or lithographic patterning of graphene features.