Figure 10.
Electrical properties of neural microelectrodes modified with CP nanotubes. (a) Impedance spectroscopy over a frequency range of 1–105 Hz: bare gold (black), PPy nanotubes (green) and PEDOT nanotubes (red). Cyclic voltammetry: bare gold (black), PPy nanotubes (green) and PEDOT nanotubes (red). Deposition charge density = 1.44 C cm−2, scan rate = 0.1 V s−1 (Abidian & Martin 2008). (b) Scanning electron micrographs of electropolymerized PPy and PEDOT nanotubes on neural microelectrode sites. (i) Top view of PPy nanotubes, (ii) three-dimensional view of PPy nanotubes, (iii) top view PEDOT nanotubes and (iv) three-dimensional view of PEDOT nanotubes. PPy nanotubes with deposition charge density 1.44 C cm−2 (Abidian & Martin 2008).