Sorry, you need to enable JavaScript to visit this website.

Gas sensing properties of langmuir-blodgett polypyrrole film investigated by surface acoustic waves

TitoloGas sensing properties of langmuir-blodgett polypyrrole film investigated by surface acoustic waves
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione1998
AutoriPenza, Michele, Milella E., and Anisimkin V.I.
RivistaIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume45
Paginazione1125-1132
Parole chiaveAcoustic delay lines, Acoustic wave propagation, Acoustic wave velocity measurement, Ammonia, Chemical sensors, Conductive films, Electric conductivity of gases, Gas sensing properties, Langmuir Blodgett films, Lithium compounds, Molecular Structure, Polypyrrole film, Polypyrroles, Substrates, Thin films
Abstract

The gas sensing properties of organic polypyrrole (PPy) Him, deposited onto LiNhOg substrate by Langmuir-Blodgett (LB) technique, have been monitored by surface acoustic wave (SAW) delay lines and studied with respect to sensitivity, selectivity, response time, stability, repeatability, and aging. The SAW PPy elements demonstrate high sensitivity toward NHa gas with high selectivity against CH4, CO, Hs, and O-2. The detectable threshold concentration has been estimated as 20 ppm NHa in air; the response time is in the 10s seconds range, and the recovery time is about 15 min; the repeatability of the SAW response toward eight sequential NHa gas exposures is within 6%; the aging of the PPy Him is within 4% over a month; and the effect of humidity on SAW NHs gas response is negligible for the typical conditions at room ambient air. Partially reversible SAW response recognizing NHg gas as one component of an interfering gases-mixture has been observed. Simultaneous chemoreiîponses of SAW phase and insertion loss have been performed in order to investigate the sensing mechanisms. By merging with electrical conductivity gas response, the dominant SAW sensing effects for NHs gas detection are denned as elastic loading. © 1998 IEEE.

Note

cited By 44

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0032155945&doi=10.1109%2f58.726434&partnerID=40&md5=a060e6ca500941a13edbecd252e6ffc3
DOI10.1109/58.726434
Citation KeyPenza19981125