Ferromagnetic behavior of copper oxide-nanowire-covered carbon fibre synthesized by thermal oxidation

Copper oxide nanowires were synthesized on carbon fibre surfaces by annealing of copper thin films at 400 °C for 4 h in air. The nanowires were characterized with field emission scanning electron microscope (FESEM), transmission electron microscope (TEM) and X-ray diffraction (XRD). The magnetic properties of CuO nanowires were measured with a vibrating sample magnetometer (VSM). Its diameters range covered 40–100 nm and lengths range covered 1–3 μm. It is interesting that the CuO nanowires on the carbon fibres showed ferromagnetism at room temperature.