Fig. 3
Morphology changes of different metals deposited on GNF with variation of time. a–l SEM images of Au (a, b, c), Pt (d, e, f), Ag (g, h, i), and Cu (j, k, l,) depositions on GNF in 0.0125 mM HAuCl4 (pH = 5.0), 0.025 mM H2PtCl6 (pH = 4.7), 0.45 mM AgNO3 (pH = 5.5), and 0.6 mM CuSO4 (pH = 4.8) for different time, respectively (scale bar, 1 µm)
