A simple, one-step electrodeposition approach has been used to fabricate MnO on an indium-doped tin oxide substrate for highly sensitive As detection. We report an experimental limit of detection of 1 ppb through anodic stripping voltammetry with selectivity to As in the presence of 10 times higher concentrations of several metal ions. Additionally, we report the simultaneous phase evolution of active material occurring through multiple stripping cycles, wherein MnO/MnO eventually converts to MnO as a result of change in the oxidation states of manganese.
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