Multichannel odor sensor utilizing surface plasmon resonance

Abstract

An SPR odor sensor with an acrylic acid thin film and an N,N dimethylacetamide thin film as the molecular recognition membrane was prepared on a Au thin-film/glass substrate by plasma CVD. The SPR odor sensor with an acrylic acid membrane exhibited excellent selectivity for ammonia gas. The SPR odor sensor with an N,N dimethylacetamide membrane exhibited excellent selectivity for acetic acid gas. The output of the SPR odor sensor with both molecular recognition membranes deposited on a Au thin film increases with increasing concentration of each gas. We expect that the sensitivity of the SPR sensor can be improved by optimizing the thickness of the molecular recognition membrane. Right now, an experiment on the deposition of four types of molecular recognition membrane on one chip of the substrate is under way.