Disposable clark oxygen electrode using recycled materials and its application

Abstract This paper describes a remarkably inexpensive disposable Clark oxygen electrode fabricable using recycled materials and without expensive and time-consuming processes. The sensor consists of polyester sheet on which the cathode and anode patterns are deposited by vacuum evaporation, copier paper to hold the electrolyte, and gas-permeable membrane. Although deceptively simple in terms of structure and fabrication, the electrode performs well as an oxygen and proves to be suprisingly durable. Its 90% response time is between 60 and 70 s, with a good linear relationship between generated current and dissolved oxygen concentration. Although designed to be disposed of after one use, the electrode demostrates a lifespan exceeding 60 h, with very low current drift. The oxygen electrode has been applied to disposable glucose sensor. Its response time is between 60 and 70 s, and a linear relationship is obtained between 20 μM and 1.4 mM glucose. The sensor shows excellent selectivity and is applicable to urine testing.