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

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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, Co3O4, 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 Co3O4 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 NO2. 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.

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Acknowledgments

Special thanks to Dr. Katayoun Gharagozloo-Hubmann for her useful suggestions.

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Authors and Affiliations

  1. Laboratorio Materiali del Dipartimento di Meccanica, Strutture, Ambiente e Territorio, Facolta` di Ingegneria dell’Università di Cassino, Via G. di Biasio, 43, 03043, Cassino, FR, Italy

    Serena Esposito

  2. Dipartimento di Scienze Fisiche, Università di Napoli Federico II, Complesso Universitario Monte Sant’Angelo, Via Cintia, 80126, Naples, Italy

    Antonio Setaro & Pasqualino Maddalena

  3. Dipartimento di Ingegneria dei Materiali e Produzione, Università di Napoli Federico II P.le Tecchio, 80125, Naples, Italy

    Antonio Aronne & Pasquale Pernice

  4. Institut für Experimentalphysik, Freie Universität Berlin, 14195, Berlin, Germany

    Antonio Setaro

  5. Department of Automation, Electromagnetism, Information Engineering and Industrial Mathematics, University of Cassino, Via G. Di Biasio 43, 03043, Cassino, FR, Italy

    Marco Laracca

Authors
  1. Serena Esposito
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  2. Antonio Setaro
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  3. Pasqualino Maddalena
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  4. Antonio Aronne
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  5. Pasquale Pernice
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  6. Marco Laracca
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Corresponding author

Correspondence to Serena Esposito.

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Esposito, S., Setaro, A., Maddalena, P. et al. Synthesis of cobalt doped silica thin film for low temperature optical gas sensor. J Sol-Gel Sci Technol 60, 388–394 (2011). https://doi.org/10.1007/s10971-011-2483-y

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  • DOI: https://doi.org/10.1007/s10971-011-2483-y

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