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CV of (a) PPy:PSS and (b) PPy-NTs at 20 mV/s in PBS. Nyquist diagrams of (c) PPy:PSS and (d) PPy-NTs at ocp in PBS. Inset: equivalent circuits used to fit the EIS data. EIS, electrochemical impedance spectroscopy; NT, nanotube; PBS, phosphate-buffered saline; PPy, polypyrrole.
