Synthesis of highly ordered mesoporous Co <inf>3</inf> O <inf>4</inf> for gas sensing

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Journal Article
Journal of Nanoscience and Nanotechnology, 2013, 13 (5), pp. 3357 - 3359
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Highly ordered mesoporous Co 3 O 4 nanostructures were prepared using SBA-15 silica as hard templates. The mesoporous structures were characterized by X-ray diffraction, high resolution transmission electron microscopy, and N 2 adsorption/desorption isotherm analysis. The results demonstrated that the as-prepared mesoporous Co 3 O 4 has an ordered P6mm symmetric mesoporous structure. The optical absorption properties of the mesoporous Co 3 O 4 were investigated by UV-Vis spectroscopy and the results indicate that the mesoporous Co 3 O 4 materials are semiconducting with direct band gaps of 2, 1.385 and 0.38 eV. The gas-sensing performance of the mesoporous Co 3 O 4 was tested towards a series of typical solvents. They demonstrated a good sensing performance towards these vapour with rapid response and high sensitivity at low operating temperature. Copyright © 2013 American Scientific Publishers.
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