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17.05.2024 | Chemical routes to materials

Enhanced photocatalytic activity and ferromagnetic ordering in hydrogenated Zn_1−xCo_xO

verfasst von: Dimitar N. Petrov, N. T. Dang, N. D. Co, B. D. Tu, N. D. Lam, T. V. Quang, V. Q. Nguyen, J. H. Lee, B. T. Huy, D. S. Yang, D. T. Khan, T. L. Phan

Erschienen in: Journal of Materials Science

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Abstract

Impacts of hydrogen annealing on crystallographic characterization, electronic structure, and optical, photocatalytic, and magnetic properties of polycrystalline Zn_1−xCo_xO (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 Zn_1−xCo_xO. Computational investigations have also indicated that the magnetization value of H–Zn_1−xCo_xO 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–Zn_1−xCo_xO.

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Titel: Enhanced photocatalytic activity and ferromagnetic ordering in hydrogenated Zn1−xCoxO
verfasst von: Dimitar N. Petrov
N. T. Dang
N. D. Co
B. D. Tu
N. D. Lam
T. V. Quang
V. Q. Nguyen
J. H. Lee
B. T. Huy
D. S. Yang
D. T. Khan
T. L. Phan
Publikationsdatum: 17.05.2024
Verlag: Springer US
Erschienen in: Journal of Materials Science
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-024-09724-z

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