Figure 3.

The Raman spectra of the graphene films. A 2D band peak at 2,692 cm-1 and a G band peak at 1,580 cm-1 are shown. The intensity ratio of the 5 min sample is ID/IG = 2.8.

Ma and Zhang Nanoscale Research Letters 2013 8:440   doi:10.1186/1556-276X-8-440
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