Solvothermal synthesis and gas-sensing performance of Co<inf>3</inf>O <inf>4</inf> hollow nanospheres

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Journal Article
Sensors and Actuators, B: Chemical, 2009, 136 (2), pp. 494 - 498
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Co3O4 hollow nanospheres with a diameter of 200-300 nm were synthesized by a surfactant-assisted solvothermal method. X-ray diffraction and Raman spectrum measurements demonstrate that the products are pure face-centered cubic Co3O4. Transmission electron microscopy and selected area electron diffraction analyses reveal that thewalls of Co3O4 hollownanospheres have a uniform thickness of ∼40nm and are constructed by an oriented aggregation of Co3O 4 nanocrystals. The optical absorption properties of the Co 3O4 hollow nanospheres were investigated by UV-vis spectroscopy and the results indicate that the Co3O4 hollow nanospheres are semiconducting with direct band gaps of 2.23, 1.25 and 1.00 eV. The gas-sensing performance of the as-prepared Co3O 4 hollow nanospheres was investigated towards a series of typical organic solvents and fuels. The Co3O4 hollow nanospheres show good sensing performances towards toluene and acetone vapors with rapid response and high sensitivity at low operating temperature. © 2008 Elsevier B.V. All rights reserved.
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