Abstract
CuO and Cu1-(x+y)FexCoyO (x = 0.08–0, while x + y = 0.08) nanostructures (NSs) were successfully synthesized via a hydrothermal method. X–ray diffraction (XRD) analysis revealed a monoclinic phase of a crystalline CuO NS with space group C2/c. Varying Fe:Co co-doping concentrations significantly influenced the morphology, optical and magnetic properties of the obtained products. Scanning electron microscopy (SEM) revealed a microplate morphology of CuO NS with zigzag maple leaf-like edges that can be transformed into a brittle bar shape and finally to tiny submicron particles agglomerated in a parallel pipe shape. The absorption edge studied by ultraviolet–visible spectroscopy (UV–vis) displayed the red shift towards longer wavelengths with increased Co content. Vibrating sample magnetometry (VSM) results showed paramagnetic behavior of CuO NS and ferromagnetic behavior for the Cu1-(x+y)FexCoyO NSs samples. Ferromagnetism of Cu1-(x+y)FexCoyO NSs was discussed based on the F-center exchange (FCE) mechanism via oxygen vacancy defects.
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