The formation of hollow Cu oxide nanoparticles through the oxidation process has been studied with Cu nanoparticles produced
by the plasma arc discharge method. The initial copper nanoparticles had a size range of 40 - 60 nm and a thin Cu2O layer on the
surface. After oxidation at 100°C, there was no significant change in the particles. After oxidation at 200°C, however, the particles consisted
of Cu2O and CuO instead of metallic Cu. By further increasing the temperature up to 300°C, only CuO particles remained. The obtained
CuO particles had a hollow structure which resulted from the Kirkendall effect.
Keywords: Copper, hollow, nanoparticles, oxidation.
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