Synthesis and physical properties of Co3O4 nanowires

By carefully controlling the reacting time, temperature, and humidity, we have prepared Co3O4 nanowires by heating a pure cobalt foil in atmosphere. Scanning electronic microscopy demonstrates that the nanowires have a diameter ranging from 20 to 100 nm and their typical lengths are in the range of 10-20 mu m. X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectrum, and transmission electronic microscopy analyses demonstrate that the nanowires are Co3O4. The optical property of the nanowires is determined by photolummescence spectrum. The magnetic behavior of it is investigated by a magnetic property measurement system. The nanowires exhibit some novel optical and magnetic properties, which are different from its bulk material.