Abstract
A facile and green route was proposed for the synthesis of hydrangea shaped Cu2O–CuO composite in the absence of templates and additives. The result shows that the hydrangea like structure Cu2O–CuO microspheres composed of nanosheets can be easily obtained via a hydrothermal method using CuCO3·Cu(OH)2 as a precursor. The structure characterization indicates that the synthesized product is a typical bi-component Cu2O–CuO composite. Compared with that of the single component bulk CuO or Cu2O, the bi-component Cu2O–CuO not only exhibits a blue-shift band gap (2.40eV) but also present a broad absorption band from 200 to 700nm, which results from the quantum size effect and the bi-component Cu2O–CuO.
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