This paper presents the results of a detailed study of the structure of nanowhiskers (NWs) of copper oxide formed in the process of thermal oxidation. It is shown that NWs have a bi- or poly-crystalline structure with a growth direction [110]. It is noted that the formation of NWs is facilitated by the cooperation of internal stresses with the defective structure of the underlying coating, and they grow owing to surface diffusion of copper cations from the depth of the coating to the top of the whisker. It is established that NWs have a good sorption and photocatalytic ability that will allow their use in the chemical industry, including the areas of catalysis and photocatalysis.
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