Figure 1.

Graphene with different layers on SiO2/Si substrate. (a) Optical image and (b) Raman spectra of graphene with different layers on SiO2/Si substrate, which are measured and collected using 632.8-nm laser.

Huang et al. Nanoscale Research Letters 2012 7:618   doi:10.1186/1556-276X-7-618
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