Electrical conductivity of CdS films for gas sensing: Selectivity roperties to alcoholic chains

Year: 2015

Authors: Giberti A., Casotti D., Cruciani G., Fabbri B., Gaiardo A., Guidi V., Malagu C., Zonta G., Gherardi S.

Autors Affiliation: Univ Ferrara, Dept Phys & Earth Sci, I-44122 Ferrara, Italy; MIST ER Scrl, I-40129 Bologna, Italy;‎ CNR, Ist Nazl Ott, I-50124 Florence, Italy

Abstract: Nanophased cadmium sulfide powder was synthesized with a simple route and characterized with thermal, structural and morphological analysis. Conductometric gas sensors based on thick films of synthesized CdS were fabricated by means of screen-printing technology and their sensing properties were tested on a selection of alcohols, aldehydes, ketones and other gaseous compounds. We found that, at working temperature of 300 degrees C, the CdS films show a strong selectivity vs alcohols, proving that they can efficiently detect alcohols in mixtures where aldehydes and other interferers are present. The response was found to be proportional to the length of the alcoholic chain, and a possible sensing mechanism that accounts for this property was proposed. (C) 2014 Elsevier B.V. All rights reserved.


Volume: 207      Pages from: 504  to: 510

KeyWords: Gas sensor; Cadmium sulfide; Alcohols sensing; Nanostructured CdS film
DOI: 10.1016/j.snb.2014.10.054

Citations: 38
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