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Investigation of pH Sensing in Viscous Salt-added Solution by Iridium Oxide Film

A planar pH-sensitive electrode based on iridium oxide (IrOx) has been developed to measure pH responses in aqueous and viscous solutions. The planar IrOx and Ag/AgCl electrodes were fabricated on flexible polyimide substrates by sol-gel and screen-printing techniques. The IrOx electrode produced a Nernstian response of −67.2 mV/pH at the room temperature. The potentials generated by the electrodes changed when ionic materials, such as salt (NaCl), and thickening agents, such as starch, were added to the aqueous pH solutions. Improved pH results in viscous solutions after calibration in aqueous solution at known salt concentration necessitates the need for a salt sensor to calibrate interfering effects for pH accuracy.