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Impedance (a) Bode and (b) complex plane plots recorded for glassy carbon, GO, pure SnO2, 32:1 SnO2–GO, and mechanically mixed SnO2 + GO recorded in 0.1 M phosphate-buffered saline (PBS) at −0.15 V (potential at which the adopted probe, [Ru(NH3)6]Cl3, is oxidized). Points are the experimental values, while continuous lines are the simulated data according to the equivalent circuits, shown in (c).
