Fig. 3
From: Enhancement of Electrochromic Properties of Polyaniline Induced by Copper Ions
SEM images of surface on a PANI-0.5, b PANI-1, c PANI-2, d PANI-3 porous films, and cross sections of e PANI-0.5, f PANI-1, g PANI-2, h PANI-3 porous films
Fig. 3 | Nanoscale Research Letters