789305.fig.001a
(a)
789305.fig.001b
(b)
789305.fig.001c
(c)
789305.fig.001d
(d)
Figure 1: FESEM micrographs of self-assembled MnO2 thin films deposited on Ni/PET substrates at various submersion durations (a) 1 min, (b) 10 min, (c) 30 min, and (d) 60 min.