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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: Nanotechnology. 2009 Nov 30;21(1):015705. doi: 10.1088/0957-4484/21/1/015705

Figure 2.

Figure 2

(a) and (b) Optical image of graphene on 300 nm SiO2/Si and 72 nm Al2O3/Si substrate. The dashed lines highlight the edge of the single layer graphene region. (c) and (d) the gray-scale optical image from (a) and (b). The arrows highlight the edge of the single layer graphene region. (e) Raman spectra of the single-layer graphene on 300 nm SiO2/Si and 72 nm Al2O3/Si substrates. (f) The contrast spectra of single-layer graphene 300 nm SiO2/Si and 72 nm Al2O3/Si substrates.