pH sensors based on polypyrrole nanowire arrays

► HQS modified polypyrrole nanowires were fabricated by anodic electropolymerization. ► The PPy-HQS nanowire array electrodes were tested as potentiometric pH sensors. ► The sensitivity of sensors depends on the electrolyte used for nanowire synthesis. ► Better sensing performance was observed for PPy-HQS nanowires than thin films.