Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods
Само за регистроване кориснике
2021
Аутори
Popov, NinaKrehula, Stjepko
Ristić, Mira
Kuzmann, Erno
Homonnay, Zoltan
Bošković, Marko
Stanković, Dalibor M.
Kubuki, Shiro
Musić, Svetozar
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Pure and Cr-doped hematite (α-(Fe1-xCrx)2O3, x = 0, 0.026, 0.039, 0.085 or 0.135) nanorods were prepared by a simple co-precipitation and calcination method. Influence of different levels of Cr doping on the change of properties of long and thin pure hematite nanorods was investigated. Cr3+-for-Fe3+ substitution in the crystal structure of hematite was proved by measuring a gradual contraction of the unit cell and a gradual decrease of the hyperfine magnetic field by increasing the Cr molar fraction. Cr doping induced an increase in the width and thickness of hematite nanorods, as well as a decrease in the overall surface area. Low temperature 57Fe Mössbauer spectroscopy showed that the Morin transition in hematite was suppressed by Cr doping to temperatures below 80 K. Magnetic measurements confirmed the suppression of the Morin transition in Cr-doped hematite down to 5 K. Infrared spectra of Cr-doped hematite samples showed shifts of IR bands by Cr3+-for-Fe3+ substitution. Optical pr...operties of α-Fe2O3 nanorods changed significantly by Cr doping – the absorption edge was shifted to higher wavelengths, accompanied by a greater absorption in the visible range and narrowed direct and indirect optical band gaps. The improved visible light photocatalytic activity of hematite nanorods in the heterogeneous photo-Fenton process by moderate Cr doping was measured, which can be attributed to the modifications in electronic structure and optical properties. © 2020 Elsevier Ltd
Кључне речи:
Cr dopant / Hematite / Morin transition / Mössbauer spectroscopy / Optical band gapИзвор:
Journal of Physics and Chemistry of Solids, 2021, 148Финансирање / пројекти:
- Bilateral Croatian-Serbian scientific project
- Croatian Science Foundation [IP-2016-06-8254]
DOI: 10.1016/j.jpcs.2020.109699
ISSN: 0022-3697
WoS: 000586405300057
Scopus: 2-s2.0-85089802392
Институција/група
VinčaTY - JOUR AU - Popov, Nina AU - Krehula, Stjepko AU - Ristić, Mira AU - Kuzmann, Erno AU - Homonnay, Zoltan AU - Bošković, Marko AU - Stanković, Dalibor M. AU - Kubuki, Shiro AU - Musić, Svetozar PY - 2021 UR - https://vinar.vin.bg.ac.rs/handle/123456789/9619 AB - Pure and Cr-doped hematite (α-(Fe1-xCrx)2O3, x = 0, 0.026, 0.039, 0.085 or 0.135) nanorods were prepared by a simple co-precipitation and calcination method. Influence of different levels of Cr doping on the change of properties of long and thin pure hematite nanorods was investigated. Cr3+-for-Fe3+ substitution in the crystal structure of hematite was proved by measuring a gradual contraction of the unit cell and a gradual decrease of the hyperfine magnetic field by increasing the Cr molar fraction. Cr doping induced an increase in the width and thickness of hematite nanorods, as well as a decrease in the overall surface area. Low temperature 57Fe Mössbauer spectroscopy showed that the Morin transition in hematite was suppressed by Cr doping to temperatures below 80 K. Magnetic measurements confirmed the suppression of the Morin transition in Cr-doped hematite down to 5 K. Infrared spectra of Cr-doped hematite samples showed shifts of IR bands by Cr3+-for-Fe3+ substitution. Optical properties of α-Fe2O3 nanorods changed significantly by Cr doping – the absorption edge was shifted to higher wavelengths, accompanied by a greater absorption in the visible range and narrowed direct and indirect optical band gaps. The improved visible light photocatalytic activity of hematite nanorods in the heterogeneous photo-Fenton process by moderate Cr doping was measured, which can be attributed to the modifications in electronic structure and optical properties. © 2020 Elsevier Ltd T2 - Journal of Physics and Chemistry of Solids T1 - Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods VL - 148 DO - 10.1016/j.jpcs.2020.109699 ER -
@article{ author = "Popov, Nina and Krehula, Stjepko and Ristić, Mira and Kuzmann, Erno and Homonnay, Zoltan and Bošković, Marko and Stanković, Dalibor M. and Kubuki, Shiro and Musić, Svetozar", year = "2021", abstract = "Pure and Cr-doped hematite (α-(Fe1-xCrx)2O3, x = 0, 0.026, 0.039, 0.085 or 0.135) nanorods were prepared by a simple co-precipitation and calcination method. Influence of different levels of Cr doping on the change of properties of long and thin pure hematite nanorods was investigated. Cr3+-for-Fe3+ substitution in the crystal structure of hematite was proved by measuring a gradual contraction of the unit cell and a gradual decrease of the hyperfine magnetic field by increasing the Cr molar fraction. Cr doping induced an increase in the width and thickness of hematite nanorods, as well as a decrease in the overall surface area. Low temperature 57Fe Mössbauer spectroscopy showed that the Morin transition in hematite was suppressed by Cr doping to temperatures below 80 K. Magnetic measurements confirmed the suppression of the Morin transition in Cr-doped hematite down to 5 K. Infrared spectra of Cr-doped hematite samples showed shifts of IR bands by Cr3+-for-Fe3+ substitution. Optical properties of α-Fe2O3 nanorods changed significantly by Cr doping – the absorption edge was shifted to higher wavelengths, accompanied by a greater absorption in the visible range and narrowed direct and indirect optical band gaps. The improved visible light photocatalytic activity of hematite nanorods in the heterogeneous photo-Fenton process by moderate Cr doping was measured, which can be attributed to the modifications in electronic structure and optical properties. © 2020 Elsevier Ltd", journal = "Journal of Physics and Chemistry of Solids", title = "Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods", volume = "148", doi = "10.1016/j.jpcs.2020.109699" }
Popov, N., Krehula, S., Ristić, M., Kuzmann, E., Homonnay, Z., Bošković, M., Stanković, D. M., Kubuki, S.,& Musić, S.. (2021). Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods. in Journal of Physics and Chemistry of Solids, 148. https://doi.org/10.1016/j.jpcs.2020.109699
Popov N, Krehula S, Ristić M, Kuzmann E, Homonnay Z, Bošković M, Stanković DM, Kubuki S, Musić S. Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods. in Journal of Physics and Chemistry of Solids. 2021;148. doi:10.1016/j.jpcs.2020.109699 .
Popov, Nina, Krehula, Stjepko, Ristić, Mira, Kuzmann, Erno, Homonnay, Zoltan, Bošković, Marko, Stanković, Dalibor M., Kubuki, Shiro, Musić, Svetozar, "Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods" in Journal of Physics and Chemistry of Solids, 148 (2021), https://doi.org/10.1016/j.jpcs.2020.109699 . .