Potentiometric pCO2 Sensor and the Fabrication Method thereof

摘要

This invention provides a pCO₂ sensor, and more particularly, a potentiometric pCO₂ sensor. The potentiometric pCO₂ sensor has a substrate, a solid ion-sensing layer on the substrate, a solid electrolyte layer on the solid ion-sensing layer, and a gas-permeable layer on the solid electrolyte layer. In addition, the gas-permeable layer allows air molecules to diffuse through, the solid electrolyte layer change the pH value thereof according to the CO₂ concentration in the diffusing air molecules, and the solid ion-sensing layer senses the pH change of the solid electrolyte layer to generate a sensing signal. By doing so, the quantity of the CO₂ dissolved in the liquid can be measured.