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Detectarea gazelor toxice prin măsurarea impedanţei peliculelor de telur

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dc.contributor.author MOCREAC, Olga
dc.date.accessioned 2019-12-05T12:34:12Z
dc.date.available 2019-12-05T12:34:12Z
dc.date.issued 2012
dc.identifier.citation MOCREAC, Olga. Detectarea gazelor toxice prin măsurarea impedanţei peliculelor de telur. In: Telecommunication, Electronics and Informatics - ICTEI 2012: proc. of the 4th intern. conf., Technical University of Moldova, May 17-20, 2012. Chișinău, 2012, Vol. 2, pp. 205-210. ISBN 978-9975-45-082-9. en_US
dc.identifier.isbn 978-9975-45-082-9
dc.identifier.uri http://repository.utm.md/handle/5014/7304
dc.description.abstract Impedance spectra of tellurium thin films with interdigital platinum electrodes have been investigated in different gaseous media. For the first time it is pointed out that tellurium films exhibit sensitivity to H2 at room temperature along with sensitivity to NO2 and H2S. Analyses of Nyquist diagrams allowed evaluating the characteristic frequency, time constant, resistance and capacity of the film in different target gases. It is shown that impedance spectra being strongly influenced by gaseous environment do not change their general shape. The sensitivity for impedance or its imaginary part depends on frequency, being the highest to NO2 (~50 % / ppm) but 8 % / ppm and 10-2 % / ppm to H2S and H2 respectively. It is suggested that effect of H2 is due to removal the amount of adsorbed oxygen on the Te surface, whereas effect of NO2 and H2S results respectively from "strong" and "weak" chemisorptions of these molecules on the surface and intra grain regions. en_US
dc.language.iso ro en_US
dc.publisher Tehnica UTM en_US
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/us/ *
dc.subject impedanţă en_US
dc.subject telur en_US
dc.subject H2 en_US
dc.title Detectarea gazelor toxice prin măsurarea impedanţei peliculelor de telur en_US
dc.type Article en_US


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