Design and Validation of a Low-Cost Paper-Based Oxygen Electrode

Abstract

Abstract Disposable Clark-type oxygen electrodes were fabricated using filter paper as the substrate of the electrodes, which also served to absorb the electrolyte required. The oxygen electrode has a two-electrode configuration and both the anode and cathode were deposited directly on filter paper by sputtering a layer of silver. Silicone rubber was used as the gas-permeable membrane. The whole fabricating procedure dispensed with the expensive photolithographic process used in silicon- and glass based oxygen electrodes, decreasing both the cost and time required for fabrication. The electrodes showed good characteristics for voltammetrically detecting dissolved oxygen and their dynamic range covered the entire possible range of dissolved oxygen concentrations. The electrodes had a 90% response time of 12 seconds and a life time of about 2 hours.