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Nanotechnology Volume 18 Number 47 Create an alert RSS this journal

D Buso et al 2007 Nanotechnology 18 475505 doi:10.1088/0957-4484/18/47/475505

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

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D Buso1, G Busato1, M Guglielmi1, A Martucci1, V Bello2, G Mattei2, P Mazzoldi2 and M L Post3

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Abstract References Cited By

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.


PACS

81.16.-c Methods of nanofabrication and processing

82.80.-d Chemical analysis and related physical methods of analysis

78.66.-w Optical properties of specific thin films

78.67.Bf Nanocrystals and nanoparticles

81.20.Fw Sol-gel processing, precipitation

07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing

Subjects

Instrumentation and measurement

Surfaces, interfaces and thin films

Condensed matter: structural, mechanical & thermal

Nanoscale science and low-D systems

Chemical physics and physical chemistry

Dates

Issue 47 (28 November 2007)

Received 22 August 2007, in final form 21 September 2007

Published 26 October 2007



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