Figure 3. Typical structures of ran

Figure 3. Typical structures of random, VA-CNTs and the schematic illumination of VA-CNT based supercapacitors. (a) SEM image of the as -grown randomly entangled SWNTs [32]. Reprinted from Ref. [32] with permission. Copyright 2001, John Wiley and Sons. (b,c) SEM images of the as-grown forest (b) after having been solidified with a droplet of liquid (c) [35]. Reprinted from Ref. [35] with permission. Copyright 2006, Nature Publishing Group. (d) SEM image of a plasma-etched VA-CNT electrode (scale bar: 100 μm). (e) Higher magnification view of the electrode (scale bar: 100 nm). TEM images of the CNTs before (f) and after (g) plasma etching (scale bar: 20 nm) (h) Schematic of an electrochemical capacitor based on plasma-etched VA-CNT electrodes and ionic liquid electrolyte. [44]. Reprinted from Ref. [44] with permission. Copyright 2009, Elsevier.