Abstract
The oxidation of copper nanopowders fabricated by metal evaporation and condensation is studied. It is found that, in contrast to the oxidation of bulk copper samples, the oxidation of nanopowders can provide the formation of a CuO surface layer on copper particles in a reactor, bypassing the stage of Cu2O formation. The Cu2O oxide that forms on the surface of unoxidized copper powder particles spontaneously transforms almost completely into a more thermodynamically stable phase (CuO oxide) during storage in air under natural conditions.
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