418737.fig.003a
(a)
418737.fig.003b
(b)
418737.fig.003c
(c)
418737.fig.003d
(d)
Figure 3: X-ray photoelectron C1s spectra of (a) GO, (b) Pt/GO, and (c) Pt/SGO. (d) Area ratio between C–C bond and sum of others including C–O and C=O related bonds.