Abstract
Abstract: TiO2 nanowires doped with different amounts of Ni2+ ions (from 0 to 18 mol%) were synthesized by hydrothermal technique. The samples were characterized by X-ray diffraction (XRD) and Raman spectroscopy, field emission scanning electron microscopy (FESEM), and diffuse reflection spectroscopy. The XRD analysis showed that the doped samples exhibit anatase single phase. The lattice parameters remain unchanged, independent on Ni2+ content. Diameter of TiO2 nanowires increased significantly with increasing concentrations of Ni2+. The investigated results indicate that a greater portion of the Ni2+ ions are well-incorporated into the anatase TiO2 lattice. Indirect and direct band gap energies of Ni2+-doped TiO2 with different doping concentration were found to be in the range from 3.24 to 2.99 eV and 3.54 to 3.35 eV, respectively. 
 Keywords: TiO2:Ni2+ nanowires, hydrothermal, diffuse reflection, band gap energy.
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