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Sensors 2016, 16(3), 296; doi:10.3390/s16030296

Metal Sulfides as Sensing Materials for Chemoresistive Gas Sensors

1
Department of Physics and Earth Science, University of Ferrara, Via Saragat 1/c, Ferrara 44122, Italy
2
MNF- Micro Nano Facility, Bruno Kessler Foundation, Via Sommarive 18, Trento 38123, Italy
3
CNR-INO—Istituto Nazionale di Ottica, Largo Enrico Fermi 6, Firenze 50124, Italy
4
MIST E-R s.c.r.l., Via P. Gobetti 101, Bologna 40129, Italy
*
Authors to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 24 September 2015 / Revised: 6 February 2016 / Accepted: 22 February 2016 / Published: 26 February 2016
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
View Full-Text   |   Download PDF [5689 KB, uploaded 26 February 2016]   |  

Abstract

This work aims at a broad overview of the results obtained with metal-sulfide materials in the field of chemoresistive gas sensing. Indeed, despite the well-known electrical, optical, structural and morphological features previously described in the literature, metal sulfides present lack of investigation for gas sensing applications, a field in which the metal oxides still maintain a leading role owing to their high sensitivity, low cost, small dimensions and simple integration, in spite of the wide assortment of sensing materials. However, despite their great advantages, metal oxides have shown significant drawbacks, which have led to the search for new materials for gas sensing devices. In this work, Cadmium Sulfide and Tin (IV) Sulfide were investigated as functional materials for thick-film chemoresistive gas-sensors fabrication and they were tested both in thermo- and in photo-activation modes. Furthermore, electrical characterization was carried out in order to verify their gas sensing properties and material stability, by comparing the results obtained with metal sulfides to those obtained by using their metal-oxides counterparts. The results highlighted the possibility to use metal sulfides as a novel class of sensing materials, owing to their selectivity to specific compounds, stability, and the possibility to operate at room temperature. View Full-Text
Keywords: metals sulfides; chemoresistive gas sensors; thick-film; cadmium sulfide; tin (IV) sulfide metals sulfides; chemoresistive gas sensors; thick-film; cadmium sulfide; tin (IV) sulfide
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gaiardo, A.; Fabbri, B.; Guidi, V.; Bellutti, P.; Giberti, A.; Gherardi, S.; Vanzetti, L.; Malagù, C.; Zonta, G. Metal Sulfides as Sensing Materials for Chemoresistive Gas Sensors. Sensors 2016, 16, 296.

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