In this study, Ni-doped TiO2 nanoparticles with different dopant concentrations were fabricated using coprecipitation. The chemical compositions, and structural and optical properties were characterized using X-ray diffraction (XRD), electron dispersive X-ray spectroscopy (EDS), and UV-VIS diffuse reflectance spectroscopy. Identification of paramagnetic species was conducted using electron spin resonance (ESR). The XRD pattern shows that only a single phase of anatase appeared because Ni2+ has a similar ionic radius to that of Ti4+ and replaced some of the Ti4+ ions in the TiO2 lattice. The crystallite size decreased with increasing Ni content. This phenomenon probably arises from the introduction of Ni2+ ions which decreased crystalline growth. The UV-VIS diffuse reflectance spectra showed that the UV absorption moved to a longer wavelength (red shift) and the band gap energy decreased. This caused the doped Ni atoms to form a localized energy state below the conduction band of the TiO2 lattice. The ESR studies on the Ni-doped TiO2 nanoparticles revealed the presence of Ni2+, Ti3+, and oxygen defects in all samples.
|Journal of Physics: Conference Series
|Published - 29 Jan 2020
|Basic and Applied Sciences Interdisciplinary Conference 2017, BASIC 2017 - , Indonesia
Duration: 18 Aug 2017 → 19 Aug 2017