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A field effect transistor (FET) sensor for sulfur dioxide was developed based on a pH-sensitive FET. The gate surface of a the FET was coated with a thin film of hydrogel containing a hydrogensulfite electrolyte. The sulfur dioxide analyte diffuses into the reagent phase through a Teflon membrane covering the hydrogel film and produces a pH change that is monitored by the pH-FET. The sensor exhibited...
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