Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 206, Issue -, Pages 133-138Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.09.025
Keywords
Nanostructured Co3O4; Gas sensor; CO sensor; CO oxidation; Oxygen diffusion
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Cobalt oxide spinel (Co3O4) with an ordered nanostructure is used as a resistive gas sensor for carbon monoxide (CO) in low ppm concentrations. The operating temperature has a strong impact on the concentration-dependent sensing behavior. At lower temperature (473 K) the sensor response is governed mainly by surface coverage with CO and/or CO2, whereas at higher temperature (563 K) oxygen diffusion in the crystal lattice of Co3O4 strongly affects the sensing behavior. (C) 2014 Elsevier B.V. All rights reserved.
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