(a)

(b)

(c)

(d)

Figure 3: SEM images of the products by adding CTAB in the electrolyte at the different deposition times of 10 min (a), 20 min (b), 30 min (c), and 1 h (d). The insets in Figures 3(a)–3(d) show the magnification SEM images of the corresponding photos.