Selective optical detection of H2 and CO with SiO2 sol–gel films containing NiO and Au nanoparticles

NiO is a p-type semiconductor widely studied for its promising implementation in chemo-optical gas sensors. Reducing/oxidizing gases induce a change in optical absorption of NiO. It has been found that Au doping induces a remarkable increase in the NiO sensitivity, and at the same time silica films...

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Bibliographic Details
Published in:Nanotechnology 2007-11, Vol.18 (47), p.475505-475505 (7)
Main Authors: Buso, D, Busato, G, Guglielmi, M, Martucci, A, Bello, V, Mattei, G, Mazzoldi, P, Post, M L
Format: Article
Language:English
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Summary:NiO is a p-type semiconductor widely studied for its promising implementation in chemo-optical gas sensors. Reducing/oxidizing gases induce a change in optical absorption of NiO. It has been found that Au doping induces a remarkable increase in the NiO sensitivity, and at the same time silica films obtained by the sol-gel technique have been demonstrated to be a suitable support matrix for gas-sensitive materials due to their extremely high specific surface area (up to 600 m2 g-1). The aim of this work is the synthesis of SiO2 films containing both NiO and Au nanoparticles and their morphological and functional characterization as active gas-sensing materials suitable for optical detectors. The possibility to selectively recognize H2 and CO is studied exploiting the wavelength dependence of the gas-induced optical transmittance variation.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/18/47/475505