Kumari, Kavita Aljawfi, Rezq Naji Vij, Ankush Chae, K. H. Hashim, Mohd. Alvi, P. A. Kumar, Shalendra 2024-01-19T20:32:57Z 2024-01-19T20:32:57Z 2021-09-02 2019-03 0957-4522 https://pubs.kist.re.kr/handle/201004/120265 In cerium dioxide (CeO2) as semiconductor compound, the tuning of band gap energy is a pivotal feature for visible light applications. In this report, nanoparticles (NPs) of Ce1-xNixO2 (0.0x0.10) were synthesized through co-precipitation route. The structural, electronic state and optical band gap were investigated by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), near edge X-ray absorption fine structure (NEXAFS) spectroscopy, Raman scattering and UV-Vis spectroscopy. XRD results revealed the single-phase nanocrystalline behavior of CeO2 with cubic fluorite structure. The electronic configuration of the samples, probed via NEXAFS spectra at Ce M-5,M- 4 edges, demonstrated that the cerium exists in Ce4+ and Ce3+ mixed valence states. The formation of Ce3+ ions in the vicinity of oxygen vacancies (Ov) were assessed also via Raman scattering and XANES spectra at Ce L-3 edge. The estimated concentrations of Ce3+ were increased from 6 to 13% as the Ni content increase from 0 to 10% respectively. Here, the inclusion of Ni2+ ions into CeO2 network induced additional Ov and simultaneously reduced the optical band gap from 3.9eV for pure CeO2 to 2.6eV for 10% Ni doped CeO2 NPs. Therefore, the oxygen loss population seem to be responsible for the band gap reduction. The role of Ov for creating profound donor band near the conduction band and narrowing the band gap energy were discussed. English SPRINGER VACANCIES Band gap engineering, electronic state and local atomic structure of Ni doped CeO2 nanoparticles Article 10.1007/s10854-019-00746-x 1 JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, v.30, no.5, pp.4562 - 4571 JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 30 5 4562 4571 scie scopus 000461168600024 2-s2.0-85060576274 Engineering, Electrical & Electronic Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Engineering Materials Science Physics Article VACANCIES Band gap engineering CeO2 nanoparticles electronic state local atomic structure near edge X-ray absorption fine structure