Abstract
Co-doped titanium dioxide (TiO2) nanorods with different doping concentrations were fabricated by a molten salt method. It is found that the morphology of TiO2 changes from nanorods to nanoparticles with increasing doping concentration. The mechanism for the structure and phase evolution is investigated in detail. Undoped TiO2 nanorods show strong ferromagnetism at room temperature, whereas incorporating of Co deteriorates the ferromagnetic ordering. X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR) results demonstrate that the ferromagnetism is associated with Ti vacancy.
Highlights
Titanium dioxide (TiO2) is one of the popular wide gap semiconductors that have attracted much attention for decades
The X-ray photoelectron spectroscopy (XPS) results suggest that Co ions do not incorporate into the TiO2 lattice but coat on the surface of the samples in the form of cobalt oxide (CoO), which could be in amorphous phase or with the small amount that cannot be detected by X-ray diffractometery (XRD)
Our results show that Co doping has strongly affected the morphology and phase transformation of TiO2 nanorods
Summary
Titanium dioxide (TiO2) is one of the popular wide gap semiconductors that have attracted much attention for decades. Rutile TiO2 nanorods doped with various cobalt concentrations were synthesized using a molten salt method.
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