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Sol-gel cobalt oxide-silica nanocomposite thin films for gas sensing applications |
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| Authors: | V. Musat E. Fortunato |
| Affiliation: | a Department of Metals and Materials Science, “Dunarea de Jos” University of Galati, 800008 Galati, Romania b Department of Materials Science, CENIMAT, Faculty of Sciences and Technology, New University of Lisbon, Campus da Caparica, 2829-516 Caparica, Portugal c Department of Chemical and Biological Engineering, CQFM, Technical University of Lisbon, 1049-001 Lisbon, Portugal |
| Abstract: | Various metal oxide-silica nanocomposite films have been recently proposed as gas-sensitive materials. This paper presents results on cobalt oxide-SiO2 mesoporous nanocomposite thin films templated by a cationic surfactant. The films were deposited on glass substrate by dip-coating process, using [Co(CH3COO)2]·4H2O and tetraethoxysilane (TEOS) as starting materials. The effect of withdrawal speed, number of layers and thermal treatment on the crystalline structure, morphology, Co-doping states, optical, electrical and gas sensing properties of the thin films has been investigated using X-ray diffraction, atomic force microscopy, X-ray photoelectron spectroscopy, optical transmittance and room temperature photoreduction-oxidation data. |
| Keywords: | Mesoporous thin films Cobalt oxide Silica-based nanocomposites Sol-gel Gas sensor |
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