An optical gas sensor based on polyaniline Langmuir-Blodgett films

Abstract The technique of surface plasmon resonance has been used to characterize Langmuir-Blodgett films of polyaniline. The thickness per layer obtained by curve fitting was 5.5 ± 0.6 nm. The surface plasmon resonance curves have been shown to be influenced by both NO 2 and H 2 S. The effects were partly reversible, with lower detection limits of about 50 vapour parts per million at room temperature.