Structural, optical, and magnetic study of Ni-doped TiO 2 nanoparticles synthesized by sol–gel method

摘要

In this research, the effects of transition metal (Ni) doping to metal-oxide nanoparticles (TiO~(2)) were studied. Various weight ratios (5, 10, 15, and 20%) of Ni-to-TiO~(2)nanoparticles were synthesized using the sol–gel technique. These doped nanoparticles were prepared using titanium butoxide and nickel nitrate as precursors and methanol as a solvent. The effects of Ni doping to TiO~(2)were examined using a variety of characterization techniques, X-ray diffraction (XRD), Fourier-transform-infrared (FTIR) spectroscopy, ultraviolet–visible (UV–Vis) spectroscopy, field-emission scanning electron microscopy (FESEM), and vibrating sample magnetometer (VSM). The XRD reveals that the Ni-doped TiO~(2)crystallizes in a tetragonal structure with anatase phase. The particle size and lattice strain were calculated by Williamson–Hall equation. The presence of strong chemical bonding and functional groups at the interface of TiO~(2)nanoparticles was confirmed by FTIR. The optical properties of undoped and doped samples were recorded by UV–Vis spectroscopy. The saturation magnetization ( M ~(s)) was found higher for undoped as compared to doped samples. The surface morphology and the element structure of the Ni-doped TiO~(2)nanoparticles were examined by FESEM.