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SAW gas detection using Langmuir-Blodgett polypyrrole films

TitoloSAW gas detection using Langmuir-Blodgett polypyrrole films
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione1998
AutoriMilella, E., and Penza Michele
RivistaThin Solid Films
Volume327-329
Paginazione694-697
Parole chiaveAbsorption, Acoustic response, Acoustic surface wave devices, Chemical sensors, Langmuir Blodgett films, Lithium compounds, Nitrogen compounds, Plastic films, Polypyrroles, Scanning electron microscopy, Secondary ion mass spectrometry, Transducers, X ray photoelectron spectroscopy
Abstract

Surface acoustic wave (SAW) devices are very attractive as gas sensors due to high sensitivity and low cost. Polypyrrole, obtained by a solid reaction from a ferric stearate Langmuir-Blodgett (LB) film, has been deposited onto 128· YX-LiNbO3 substrate in order to implement a SAW chemical sensor. The formation of the conducting polymer has been confirmed by X-ray photoelectron spectroscopy (XPS), secondary i on mass spectrometry (SIMS) and scanning electron microscopy (SEM) measurements. The SAW dalay line, equipped by interdigital transducers operating at a frequency of 42 M Hz and coated by a sensitive polypyrrole LB film, has been tested towards NH3 gas in air. Due to the absorption process, the various loadings cause a variation of acoustic wave velocity measured by the phase shift technique at the output of SAW device. Partially reversible SAW acoustic response towards NH3 in air has showed high sensitivity. The calibration curve towards NH3, its detection limit and degradation phenomena of the coating have been performed. Our LB polypyrrole SAW detector exhibits excellent selectivity towards NH3.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0032140154&doi=10.1016%2fS0040-6090%2898%2900743-3&partnerID=40&md5=31f9ee1cad991a11da914d6f1f22c3ca
DOI10.1016/S0040-6090(98)00743-3
Citation KeyMilella1998694