Nanostructured sol-gel silica thin films doped with NiO and SnO2 for gas sensing applications

Nanoporous SiO2 thin films containing different functional oxide nanoparticles (NiO, SnO2) were synthesised by sol-gel methods and the gas response to H2, CO and humidity was determined by volt amperometric techniques. The structure development of the nanocomposite films was studied by XRD, TEM, FT-...

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Bibliographic Details
Published in:Journal of materials chemistry 2004-01, Vol.14 (19), p.2889-2895
Main Authors: MARTUCCI, Alessandro, BUSO, Dario, DE MONTE, Matthias, GUGLIELMI, Massimo, CANTALINI, Carlo, SADA, Cinzia
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Physics
Online Access:Get full text
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Summary:Nanoporous SiO2 thin films containing different functional oxide nanoparticles (NiO, SnO2) were synthesised by sol-gel methods and the gas response to H2, CO and humidity was determined by volt amperometric techniques. The structure development of the nanocomposite films was studied by XRD, TEM, FT-IR spectroscopy and SIMS. Films of molar composition 60SiO2-40NiO and 60SiO2-40SnO2 showed homogeneously dispersed round shaped oxide nanocrystals of 3-4 nm mean diameter. The gas response of films deposited on Si /Si3N4 substrates provided with Pt interdigital electrodes was measured at different operating temperatures ranging from 25 to 350 C and gas concentrations between 10 and 1000 ppm. NiO and SnO2 nanocomposite films showed a p-type and n-type response, respectively, with greater sensitivity to H2 gas than CO in the whole range of operating temperatures. 25 refs.
ISSN:0959-9428
1364-5501
DOI:10.1039/b405301j