Hydrogel coating composition for chemical sensor and chemical sensor fabricated using same

Abstract

A hydrogel coating composition for a chemical sensor includes a photo-crosslinkable monomer containing a cationic functional group; a pH indicator dye; a viscosity modifier; and a solvent. The hydrogel coating composition for a chemical sensor can be used for identifying freshness of foods by detecting volatile basic nitrogen or toxic chemicals generated when food spoils, such as ammonia, hydrogen sulfide, etc., and can be coated in desired patterns on a substrate. A chemical sensor fabricated from the hydrogel coating composition is designed to fix a pH indicator dye through an ionic bond to prevent the detachment of the indicator dye. Therefore, the chemical sensor exhibits excellent color reproducibility and has stability as a sensor.

Dependencies are inferred from the claim text.