(a)
(b)
(c)
Figure 7:
The surface morphology of (a) pristine PEDOT: PSS; (b) doping ratio of PEDOT: PSS to dilute H
_{2}
SO
_{4}
is 25 : 2; (c) doping ratio of PEDOT: PSS to dilute H
_{2}
SO
_{4}
is 25 : 4.