NDLI: Synthesis of cobalt doped silica thin film for low temperature optical gas sensor

Content Provider	Springer Nature Link
Author	Esposito, Serena Setaro, Antonio Maddalena, Pasquali Aronne, Antonio Pernice, Pasquale Laracca, Marco
Copyright Year	2011
Abstract	A modified sol–gel method was used to prepare cobalt doped silica thin film with a cobalt content of 10, 20 and 30 mol% (10Co, 20Co and 30Co). The prepared films were annealed at different temperatures in the range 400–1,000 °C, and their structural evolution examined. The mixed valence cobalt oxide, Co$_{3}$O$_{4}$, crystallizes only in the sample with the higher cobalt content, while cobalt silicate is the only crystalline phase detected in the sample 10Co and 20Co. Both the cobalt content and the temperature of heat treatment resulted to affect the nature of cobalt species dispersed in the silica matrix. The 30Co was selected for further investigations by FTIR spectroscopy to follow the structural evolution of 30Co film as function of the temperature and UV–Vis to get information on the cobalt valence state. The optical gas-sensing properties of 30Co films, containing Co$_{3}$O$_{4}$ as the major cobalt phase, were studied through the measuring of the film transmittance in dry air and in presence of dry air containing variable concentrations of polluting gases, CO and NO$_{2}$. The 30Co samples resulted to be highly sensitive to CO at room temperature. An explanation for the CO sensing characteristics, at low temperature, was proposed by referring to the physisorption-related mechanics of CO.
Starting Page	388
Ending Page	394
Page Count	7
File Format	PDF
ISSN	09280707
Journal	Journal of Sol-Gel Science and Technology
Volume Number	60
Issue Number	3
e-ISSN	15734846
Language	English
Publisher	Springer US
Publisher Date	2011-05-17
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thin films Cobalt oxide Optical gas sensing Sol–gel Ceramics, Glass, Composites, Natural Methods Optical and Electronic Materials Inorganic Chemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Chemistry Materials Chemistry Biomaterials Condensed Matter Physics Electronic, Optical and Magnetic Materials

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