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Copper oxide nanowhiskers are of interest as potential sensors, photodetectors, catalysts, and photocatalysts. The paper presents the data of studies related to the problems of using copper (II) oxide nanowhiskers under the effects of temperature fields and corrosive environment. As such effects, reactions of catalytic oxidation of carbon monoxide and methyl alcohol (methanol) are considered. Arrays of nanowhiskers are obtained by annealing two types of copper coatings in an oxygencontaining atmosphere. One type of the coatings was grown by the method of electrodeposition with a mechanical activation of the cathode, and the other one — without it. In the former case, coatings consisting of large defect crystals were formed, and in the latter one, coatings composed of nanocrystalline copper were formed. It is shown that, in both cases, annealing of copper coatings resulted in the formation of layers consisting of copper oxides. Both coatings showed high activity under the catalytic oxidation of carbon monoxide and methyl alcohol, but the sample obtained without mechanical activation during electrodeposition entered into the reaction much earlier than the sample obtained with mechanical activation. This may be due to a higher concentration of whiskers on the surface of the first sample. However, during prolonged tests, the activity of the first sample decreased more rapidly than the one of the sample obtained with mechanical activation. In the authors’ opinion, the decrease in the activity of the samples in oxidation reactions is due to the fracture of nanowhiskers which is caused by the change of the crystal lattice size due to their partial reduction. Applications of nanowhiskers are proposed.

Nanowhisker structures of copper oxide under conditions of exposure to temperature fields and corrosive media