Copper oxide nanocrystallites were synthesized from Cu thin films via controlled thermal treatment under O2 and Ar flows. The nanocrystallites were synthesized at 350, 400 and 500 ◦C. XRD revealed that substoichiometric copper oxides such as Cu4O3 and Cu64O were emerged with Cu and CuO for samples treated at 350 ◦C and 450 ◦C, respectively, whereas single monoclinic CuO was ...
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