Study on a pCO2 Sensor Based on a SnO2/Carbon Electrode

Abstract

This study developed a potentiometric sensor to measure dissolved carbon dioxide. The potentiometric sensor was based on a /carbon structure. The sensor based on the /carbon electrode was made by coating the surface of with a silicone rubber film doped with valinomycin and covered with a solid electrolyte membrane inside the gas-permeable membrane. Moreover, the solid electrolyte membrane was separated from a sample by a polysiloxane membrane, which is permeable to . The molecules diffused through the membrane into the solid electrolyte membrane, and a resulting pH change was detected by the pH-sensitive membrane. According to the experimental results, the sensitivity of the potentiometric sensor was about in the range of dissolved . The sensors based on the /carbon have an easy fabrication process. Moreover, the /carbon structure could be the substrate of a multisensor.