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3D CuO nanostructures have the fascinating physicochemical properties.However,it isstill a big challenge to develop a facile,environmentally friendly,low-cost method for thesynthesis of highly uniform hierarchical micro/nanostructures.Herein,the novel straw sheaf-like CuO single crystals[1]have been,for the first time,prepared through a facile two-step process:hydrothermal and subsequent calcination.Wehave mainly investigated the influences of the copper(Ⅱ)concentration,the added amountof hexamethylenetetramine(HMT),reaction temperature and time on the samples.The samples are characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),high-resolution transmission electron microscopy(HRTEM)and nitrogen sorptionisotherms.The results show that the formed CuO straw sheaves are fairly uniform,and the singlestraw grows preferentially along the [001] orientation.It is proposed that the CuO strawsheaves form by a crystal splitting growth process.Furthermore,under visible-lightirradiation,the CuO straw sheaves exhibit 5.3 times higher activity than the irregularsample for the degradation of rhodamine B(RhB),which has been ascribed to the exposed{110} facets and high crystallinity.