Patent ID: 7574893

Claim:
An odor sensor in which the electric conductivity thereof is varied in response to odor, the odor sensor including: a mixed material in which β-carotene and a reducing agent to prevent the oxidation of the β-carotene are dispersed in a viscous liquid, wherein the reducing agent is any of sodium thiosulfate(Na 2 S 2 O 3 ), hydro nicotinamide adenine dinucleotide phosphate (NADPH), Na2(H2PO2) and L-ascorbic acid and the viscous liquid is a liquid with high viscosity and polarity; and a cathode electrode and an anode electrode that are disposed so as to be in contact with the mixed material, wherein odor of an odorant is detected when the β-carotene in the mixed material absorbs and reacts with the odorant causing electric conduction property variation between the cathode electrode and the anode electrode.