Figure 3.
FT-IR spectra of (a) RGO-para-AZO, (b) para-AZO, (c) RGO, (d) RGO-ortho-AZO and (e) ortho-AZO with the magnified view in the region of 1280–980 cm−1. Arrows indicate the red-shifts of the bands corresponding to sulfonic group.
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