RGD Peptide-Grafted Graphene Oxide as a New Biomimetic Nanointerface for Impedance-Monitoring Cell Behaviors

Figure 3

(a) EIS characterization of unmodified, GO-modified, and RGD-GO-modified ITO electrode. (b) A diagram of the equivalent circuit. Wherein represents the ohmic resistance of the electrolyte solution, represents charge transfer resistance, CPE represents constant phase element ( = 1/), and represents Warburg impedance. (c) Fitted values of the equivalent circuit elements.

(a)

(b)

(c)