Metal Sulfides as Sensing Materials for Chemoresistive Gas Sensors

Year: 2016

Authors: Gaiardo A., Fabbri B., Guidi V., Bellutti P., Giberti A., Gherardi S., Vanzetti L., Malagu C., Zonta G.

Autors Affiliation: Univ Ferrara, Dept Phys & Earth Sci, Via Saragat 1-C, I-44122 Ferrara, Italy; Bruno Kessler Fdn, MNF, Via Sommarive 18, I-38123 Trento, Trento, Italy; CNR, Ist Nazl Ott, Largo Enrico Fermi 6, I-50124 Florence, Italy;‎ MIST ER Scrl, Via P Gobetti 101, I-40129 Bologna, Italy

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.

Journal/Review: SENSORS

Volume: 16 (3)      Pages from: 296-1  to: 296-19

KeyWords: thick-film; tin (IV) sulfide; chemoresistive gas sensors; cadmium sulfide; metals sulfides
DOI: 10.3390/s16030296

Citations: 66
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