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Mixed nanocrystalline copper oxides were prepared from pre-sputtered copper films at 500 °C for various oxidation times. Mixed orthorhombic Cu64O and monoclinic CuO phases with CuO phase ration varied from 57.8 to 90.8% were obtained upon varying the oxidation time from 1 to 3 h. SEM observations revealed the nanocrystallites morphologies for the oxidized films. The film oxidized for 1 h have sizes...
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