Fig. 2
SEM images of different metals deposition on GNF and NF. a, e, i, and m images of Au, Pt, Ag, and Cu deposition on GNF in 0.09 mM HAuCl4 (pH = 4.2), 0.09 mM H2PtCl6 (pH = 4.5), 0.9 mM AgNO3 (pH = 5.3), and 0.9 mM CuSO4 (pH = 4.6) for 1 h, respectively (b, f, j and n are corresponding high resolution images). c, g, k, and o images of Au, Pt, Ag, and Cu deposition on NF in the same electrolytes above for 1 h, respectively (d, h, l, and p are corresponding high resolution images). Scale bar is 5 µm for a, e, i, and m; 1 µm for b, f, j, k, and o; 0.5 µm for c and g; and 0.2 µm for d, h, l, n, and p
