Figure 1

Structural and optical properties of few-layer graphene grown under hydrogen-free and low-temperature PECVD.
(a) The AFM image and (b) the cross-sectional profile scanned from point A of the synthesized few-layer graphene. (c) The non-linear transmittance of the synthesized graphene. (d) The Raman spectra of commercial single-layer graphene and hydrogen-free synthesized few-layer graphene.