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Abstract
Nanocrystalline cobalt oxide Co3O4 and composite ZnO/Co3O4 are obtained by chemical deposition from solutions followed by thermal annealing. It is shown that the presence of zinc oxide particles during synthesis radically changes the mechanism of the cobalt carbonates growth, which leads to a change in the phase composition, morphology, and properties of the material. The resistivity of the conducting layers formed from composite ZnO/Co3O4 is three orders of magnitude lower than the resistivity of Co3O4 layers, and composite ZnO/Co3O4 gas sensors demonstrate much higher gas sensitivity than that of control cobalt oxide sensors.
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