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- Title
Enhanced photocatalytic activity and ferromagnetic ordering in hydrogenated Zn<sub>1−x</sub>Co<sub>x</sub>O.
- Authors
Petrov, Dimitar N.; Dang, N. T.; Co, N. D.; Tu, B. D.; Lam, N. D.; Quang, T. V.; Nguyen, V. Q.; Lee, J. H.; Huy, B. T.; Yang, D. S.; Khan, D. T.; Phan, T. L.
- Abstract
Impacts of hydrogen annealing on crystallographic characterization, electronic structure, and optical, photocatalytic, and magnetic properties of polycrystalline Zn1−xCoxO (x = 0.01–0.06) samples have been considered. Structural analyses based on powder X-ray diffraction, Rietveld refinement, and Raman spectroscopy prove all materials having the P63mc wurtzite-type structure. The Co-doping and hydrogenation changed the concentration of Zn– and O–related defects whose energy levels occupy the band gap. This also enhanced photocatalytic performance of hydrogenated samples with x > 0.02. X-ray and UV–Vis absorption analyses indicate the substitution of Co2+ for Zn2+ in the wurtzite-type ZnO lattice, leading to irregularly changed the unit-cell parameters. While all the as-prepared samples are paramagnetic, the hydrogenated ones exhibit weak ferromagnetism. Ferromagnetic (FM) ordering increases when x increases, particularly for x ≥ 0.02. According to the results achieved from studying crystalline and electronic structures, we believe that oxygen-vacancies-mediated interactions between Co2+ ions and H–Co–H exchange dimers enhanced FM ordering in hydrogenated Zn1−xCoxO. Computational investigations have also indicated that the magnetization value of H–Zn1−xCoxO is influenced by the positioning of the H dopant, meaning that the couplings between Co and H play an essential role in establishing FM order in H–Zn1−xCoxO.
- Subjects
PHOTOCATALYSTS; BAND gaps; X-ray powder diffraction; ELECTRONIC structure; RIETVELD refinement; SILVER; IRRADIATION; MAGNETIC entropy
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 21, p9217
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-024-09724-z