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Galluzzi A, Buchkov K, Blagoev BS, Paskaleva A, Avramova I, Mehandhziev V, Tzvetkov P, Terziyska P, Kovacheva D, Polichetti M. Strong Magneto-Optical Kerr Effects in Ni-Doped ZnO Nanolaminate Structures Obtained by Atomic Layer Deposition. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6547. [PMID: 37834684 PMCID: PMC10574388 DOI: 10.3390/ma16196547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 09/26/2023] [Accepted: 09/28/2023] [Indexed: 10/15/2023]
Abstract
The magneto-optical (MO) Kerr effects for ZnO and ZnO:Ni-doped nanolaminate structures prepared using atomic layer deposition (ALD) have been investigated. The chemical composition and corresponding structural and morphological properties were studied using XRD and XPS and compared for both nanostructures. The 2D array gradient maps of microscale variations of the Kerr angle polarization rotation were acquired by means of MO Kerr microscopy. The obtained data revealed complex behavior and broad statistical dispersion and showed distinct qualitative and quantitative differences between the undoped ZnO and ZnO:Ni-doped nanolaminates. The detected magneto-optical response is extensively inhomogeneous in ZnO:Ni films, and a giant Kerr polarization rotation angle reaching up to ~2° was established. This marks the prospects for further development of magneto-optical effects in ALD ZnO modified by transition metal oxide nanostructures.
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Affiliation(s)
- Armando Galluzzi
- Department of Physics ‘E.R. Caianiello’, University of Salerno, via Giovanni Paolo II, 132, Fisciano, I-84084 Salerno, Italy; (A.G.); (M.P.)
- CNR-SPIN Salerno, via Giovanni Paolo II, 132, Fisciano, I-84084 Salerno, Italy
| | - Krastyo Buchkov
- Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria; (B.S.B.); (A.P.); (V.M.); (P.T.)
| | - Blagoy S. Blagoev
- Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria; (B.S.B.); (A.P.); (V.M.); (P.T.)
| | - Albena Paskaleva
- Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria; (B.S.B.); (A.P.); (V.M.); (P.T.)
| | - Ivalina Avramova
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, bl. 10, 1113 Sofia, Bulgaria; (I.A.); (P.T.); (D.K.)
| | - Vladimir Mehandhziev
- Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria; (B.S.B.); (A.P.); (V.M.); (P.T.)
| | - Peter Tzvetkov
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, bl. 10, 1113 Sofia, Bulgaria; (I.A.); (P.T.); (D.K.)
| | - Penka Terziyska
- Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria; (B.S.B.); (A.P.); (V.M.); (P.T.)
| | - Daniela Kovacheva
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, bl. 10, 1113 Sofia, Bulgaria; (I.A.); (P.T.); (D.K.)
| | - Massimiliano Polichetti
- Department of Physics ‘E.R. Caianiello’, University of Salerno, via Giovanni Paolo II, 132, Fisciano, I-84084 Salerno, Italy; (A.G.); (M.P.)
- CNR-SPIN Salerno, via Giovanni Paolo II, 132, Fisciano, I-84084 Salerno, Italy
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Urbonavicius M, Varnagiris S, Tuckute S, Sakalauskaite S, Demikyte E, Lelis M. Visible-Light-Driven Photocatalytic Inactivation of Bacteria, Bacteriophages, and Their Mixtures Using ZnO-Coated HDPE Beads as Floating Photocatalyst. MATERIALS 2022; 15:ma15041318. [PMID: 35207858 PMCID: PMC8879144 DOI: 10.3390/ma15041318] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/05/2022] [Accepted: 02/07/2022] [Indexed: 02/01/2023]
Abstract
Semiconductor materials used as photocatalysts are considered among the most effective ways to treat biologically polluted water. Certainly, efficiency depends on the selection of photocatalyst and its substrate, as well as the possibility of its application in a broader spectrum of light. In this study, a reactive magnetron sputtering technique was applied for the immobilisation of ZnO photocatalyst on the surface of HDPE beads, which were selected as the buoyant substrates for enhanced photocatalytic performance and easier recovery from the treated water. Moreover, the study compared the effect on the inactivation of the microorganism between ZnO-coated HDPE beads without Ni and with Ni underlayer. Crystal structure, surface morphology, and chemical bonds of as-deposited ZnO films were investigated by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, respectively. Visible-light-induced photocatalytic treatment was performed on the Gram-negative and Gram-positive bacteria and bacteriophages PRD1, T4, and their mixture. Higher bacteria inactivation efficiency was obtained using the ZnO photocatalyst with Ni underlayer for the treatment of S. Typhimurium and M. Luteus mixtures. As for infectivity of bacteriophages, T4 alone and in the mixture with PRD1 were more affected by the produced photocatalyst, compared with PRD1.
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Affiliation(s)
- Marius Urbonavicius
- Center for Hydrogen Energy Technologies, Lithuanian Energy Institute, 3 Breslaujos, 44403 Kaunas, Lithuania; (S.V.); (S.T.); (M.L.)
- Correspondence: ; Tel.: +370-37-401-824
| | - Sarunas Varnagiris
- Center for Hydrogen Energy Technologies, Lithuanian Energy Institute, 3 Breslaujos, 44403 Kaunas, Lithuania; (S.V.); (S.T.); (M.L.)
| | - Simona Tuckute
- Center for Hydrogen Energy Technologies, Lithuanian Energy Institute, 3 Breslaujos, 44403 Kaunas, Lithuania; (S.V.); (S.T.); (M.L.)
| | - Sandra Sakalauskaite
- Department of Biochemistry, Faculty of Natural Sciences, Vytautas Magnus University, 44404 Kaunas, Lithuania; (S.S.); (E.D.)
| | - Emilija Demikyte
- Department of Biochemistry, Faculty of Natural Sciences, Vytautas Magnus University, 44404 Kaunas, Lithuania; (S.S.); (E.D.)
| | - Martynas Lelis
- Center for Hydrogen Energy Technologies, Lithuanian Energy Institute, 3 Breslaujos, 44403 Kaunas, Lithuania; (S.V.); (S.T.); (M.L.)
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