843410.fig.007a
(a)
843410.fig.007b
(b)
843410.fig.007c
(c)
Figure 7: The surface morphology of (a) pristine PEDOT: PSS; (b) doping ratio of PEDOT: PSS to dilute H2SO4 is 25 : 2; (c) doping ratio of PEDOT: PSS to dilute H2SO4 is 25 : 4.