Figure 2From: Vertically aligned ZnO nanorod core-polypyrrole conducting polymer sheath and nanotube arrays for electrochemical supercapacitor energy storageSEM images of ZnO nanorod arrays coated with pulsed current polymerized PPy sheath. (A) Initial stage of PPy oligomers cluster deposition, (B) ZnO core-PPy sheath structure after 10 k pulsed electropolymerization cycles, (C) PPy nanotube array after 2-h etch, and (D) open pore PPy nanotube array after 4-h etch.Back to article page