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(a) Nafion-coated RuOx showing nearly identical pH response to that of bare RuOx. Prolonged exposure to (used) cardiomyocyte medium (CM-TDI) decreased the pH sensitivity by about 5 mV/pH, however, still with high linearity. (b) pH calibration of Nafion-coated RuOx performed in fresh CM-TDI medium showing similar pH sensitivity, with excellent linearity.
