Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 136, Issue 2, Pages 494-498Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.11.041
Keywords
Cobalt oxide; Nanospheres; Solvothermal synthesis; Gas sensing; Sensor
Funding
- Australian Research Council (ARC) [DP059891]
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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 the walls of Co3O4 hollow nanospheres have a uniform thickness of similar to 40 nm and are constructed by an oriented aggregation of Co3O4 nanocrystals. The optical absorption properties of the Co3O4 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 Co3O4 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. (C) 2008 Elsevier B.V. All rights reserved.
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