Sol–gel cobalt oxide–silica nanocomposite thin films for gas sensing applications
2007; Elsevier BV; Volume: 516; Issue: 7 Linguagem: Inglês
10.1016/j.tsf.2007.07.197
ISSN1879-2731
AutoresViorica Muşat, Elvira Fortunato, A.M. Botelho do Rego, Regina da Conceição Corredeira Monteiro,
Tópico(s)Analytical Chemistry and Sensors
ResumoVarious 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.
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