Abstract
A facile one-step microwave-assisted synthetic route was developed to prepare ultrathin and defect free CuO nanosheets without any surfactant. During the synthetic process, the 100 mL of water and ethanol mixed solution (1/1, v/v) containing 0.86 g of CuCl2·2H2O and 2 g of sodium hydroxide was heated by microwave irradiation at a power of 750 W for 20 min. Most of these CuO sheets possessed a length of 80–110 nm, 40–60 nm in width, and only 11 nm in thickness. The microstructure and morphologies of the CuO product were investigated in details by XRD, SEM, HRTEM, FT-IR, and XPS techniques, and it was found that the shapes of CuO were dependent on the concentrations of sodium hydroxide. The band gap of such CuO nanosheets was estimated to be 2.17 eV according to the UV–vis absorption curve. This effective microwave-assisted approach may be a promising route to prepare other transition metal oxides.
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