Gold-solid polymer electrolyte sensor for detecting dissolved oxygen in water

The gold-solid polymer electrolyte (Au-SPE) sensor for detecting dissolved oxygen (DO) in water was studied. The results indicated that the prepared Au-SPE sensor has a good performance in sensing DO in water. The preparation of electrode was optimized to obtain the best sensitivity. The potential windows of DO reduction on Au/Nafion® electrode in aqueous solutions were determined. The interference of NH4+, NO3− and Cl− were also examined. The Au-SPE sensor shows a high selectivity for DO detection.