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This study aims to fabricate copper oxide (CuO) nanowires by annealing a copper film formed on a charged film of fluorine-doped tin oxide (FTO). However, from the viewpoint of stress and growth of nanowires, it is difficult to mass-produce CuO nanowires on the entire region of the macro area on the plane substrate. In the proposed study, this was made possible by modifying the substrate's structure. [ABSTRACT FROM AUTHOR]

We have investigated the effects of grain size and orientation of copper substrates for the growth of cupric oxide nanowires by thermal oxidation method. Long, less-roughness, high-density, and aligned cupric oxide nanowires have been synthesized by heating (200) oriented copper foils with small grain size in air gas. Long and aligned nanowires of diameter around 80nm can only be formed within a short temperature range from 400 to 700?C. On the other hand, uniform, smooth-surface, and aligned nanowires were not formed in the case of larger crystallite size of copper foils with (111) and (200) orientation. Smaller grain size of copper foil with (200) orientation is favorable for the growth of highly aligned, smooth surface, and larger-diameter nanowires by thermal oxidation method. [ABSTRACT FROM AUTHOR]

Abstract: CuO nanowires have been synthesized by heating a Cu foil in an ambient condition. The diameters of nanowires can be controlled by changing the annealing temperature. The morphology, composition, and structure were analyzed by using X-ray diffraction (XRD) and scanning electron microscope (SEM). To investigate the detailed layering structure of the substrates after oxidation, the cross-sectional analysis was also performed by using field emission-SEM and energy dispersive X-ray spectroscopy (EDX). The EDX measurements indicated that the CuO nanowires were grown on the CuO/Cu2O layer, which was formed on the surface of Cu foil. [ABSTRACT FROM AUTHOR]

Abstract: This study describes that CuO nanowires were synthesized by heating copper powder in air. CuO nanowires can grow on the surface of the spherical CuO/Cu2O. The samples were heated in the air within the temperature range from 300°C to 700°C. The diameter and density of nanowires can be controlled by the heating temperature and time. The products were examined by XRD, SEM and TEM. The morphology, composition, and crystal structure show that the single crystalline CuO nanowires can be synthesized on the surface of the spherical CuO/Cu2O and CuO was the only product when the sample was heated at the temperature of 500°C and higher. [Copyright &y& Elsevier]