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Shilov AO, Kamalov RV, Karabanalov MS, Chukin AV, Vokhmintsev AS, Mikhalevsky GB, Zamyatin DA, Henaish AMA, Weinstein IA. Luminescence in Anion-Deficient Hafnia Nanotubes. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:3109. [PMID: 38133006 PMCID: PMC10745887 DOI: 10.3390/nano13243109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 12/07/2023] [Accepted: 12/08/2023] [Indexed: 12/23/2023]
Abstract
Hafnia-based nanostructures and other high-k dielectrics are promising wide-gap materials for developing new opto- and nanoelectronic devices. They possess a unique combination of physical and chemical properties, such as insensitivity to electrical and optical degradation, radiation damage stability, a high specific surface area, and an increased concentration of the appropriate active electron-hole centers. The present paper aims to investigate the structural, optical, and luminescent properties of anodized non-stoichiometric HfO2 nanotubes. As-grown amorphous hafnia nanotubes and nanotubes annealed at 700 °C with a monoclinic crystal lattice served as samples. It has been shown that the bandgap Eg for direct allowed transitions amounts to 5.65 ± 0.05 eV for amorphous and 5.51 ± 0.05 eV for monoclinic nanotubes. For the first time, we have studied the features of intrinsic cathodoluminescence and photoluminescence in the obtained nanotubular HfO2 structures with an atomic deficiency in the anion sublattice at temperatures of 10 and 300 K. A broad emission band with a maximum of 2.3-2.4 eV has been revealed. We have also conducted an analysis of the kinetic dependencies of the observed photoluminescence for synthesized HfO2 samples in the millisecond range at room temperature. It showed that there are several types of optically active capture and emission centers based on vacancy states in the O3f and O4f positions with different coordination numbers and a varied number of localized charge carriers (V0, V-, and V2-). The uncovered regularities can be used to optimize the functional characteristics of developed-surface luminescent media based on nanotubular and nanoporous modifications of hafnia.
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Affiliation(s)
- Artem O. Shilov
- NANOTECH Centre, Ural Federal University, 19 Mira St., 620002 Yekaterinburg, Russia; (A.O.S.); (R.V.K.); (M.S.K.); (A.V.C.); (A.S.V.); (D.A.Z.); (A.M.A.H.)
| | - Robert V. Kamalov
- NANOTECH Centre, Ural Federal University, 19 Mira St., 620002 Yekaterinburg, Russia; (A.O.S.); (R.V.K.); (M.S.K.); (A.V.C.); (A.S.V.); (D.A.Z.); (A.M.A.H.)
| | - Maxim S. Karabanalov
- NANOTECH Centre, Ural Federal University, 19 Mira St., 620002 Yekaterinburg, Russia; (A.O.S.); (R.V.K.); (M.S.K.); (A.V.C.); (A.S.V.); (D.A.Z.); (A.M.A.H.)
| | - Andrey V. Chukin
- NANOTECH Centre, Ural Federal University, 19 Mira St., 620002 Yekaterinburg, Russia; (A.O.S.); (R.V.K.); (M.S.K.); (A.V.C.); (A.S.V.); (D.A.Z.); (A.M.A.H.)
| | - Alexander S. Vokhmintsev
- NANOTECH Centre, Ural Federal University, 19 Mira St., 620002 Yekaterinburg, Russia; (A.O.S.); (R.V.K.); (M.S.K.); (A.V.C.); (A.S.V.); (D.A.Z.); (A.M.A.H.)
| | - Georgy B. Mikhalevsky
- Institute of Geology and Geochemistry, Ural Branch of the RAS, Vonsovskogo Street, 15, 620110 Yekaterinburg, Russia;
| | - Dmitry A. Zamyatin
- NANOTECH Centre, Ural Federal University, 19 Mira St., 620002 Yekaterinburg, Russia; (A.O.S.); (R.V.K.); (M.S.K.); (A.V.C.); (A.S.V.); (D.A.Z.); (A.M.A.H.)
- Institute of Geology and Geochemistry, Ural Branch of the RAS, Vonsovskogo Street, 15, 620110 Yekaterinburg, Russia;
| | - Ahmed M. A. Henaish
- NANOTECH Centre, Ural Federal University, 19 Mira St., 620002 Yekaterinburg, Russia; (A.O.S.); (R.V.K.); (M.S.K.); (A.V.C.); (A.S.V.); (D.A.Z.); (A.M.A.H.)
- Physics Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
| | - Ilya A. Weinstein
- NANOTECH Centre, Ural Federal University, 19 Mira St., 620002 Yekaterinburg, Russia; (A.O.S.); (R.V.K.); (M.S.K.); (A.V.C.); (A.S.V.); (D.A.Z.); (A.M.A.H.)
- Institute of Metallurgy, Ural Branch of the RAS, Amundsena Street, 101, 620108 Yekaterinburg, Russia
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Araiza JDJ, Álvarez-Fraga L, Gago R, Sánchez O. Surface Morphology and Optical Properties of Hafnium Oxide Thin Films Produced by Magnetron Sputtering. MATERIALS (BASEL, SWITZERLAND) 2023; 16:5331. [PMID: 37570035 PMCID: PMC10419556 DOI: 10.3390/ma16155331] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/25/2023] [Accepted: 07/26/2023] [Indexed: 08/13/2023]
Abstract
Hafnium oxide films were deposited on sapphire and silicon (100) substrates using the DC reactive magnetron sputtering technique from a pure hafnium target at different discharge power levels. The influence of the cathode power on the chemical composition, morphology, crystallographic structure and optical properties of the films was investigated. X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and Fourier-transform infrared spectroscopy (FTIR) were employed to determine the chemical composition and bonding structure. In all cases, the films were found to be amorphous or nanocrystalline with increased crystalline content as the sputtering power was increased, according to XRD and FTIR. In addition, EDX showed that the films were oxygen-rich. The effect of power deposition on the surface topography and morphology of the films was studied using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The AFM and SEM images revealed the emergence of mound morphologies as the cathode power was increased. These features are related to blistering effects probably due to the presence of stress and its promotion within the film thickness. Finally, the optical properties showed an average transmission of 80% in the visible range, and the refractive index determined by spectral ellipsometry (SE) was found to be in the range of 1.85-1.92, close to the reported bulk value. SE was also used to study the film porosity observed by SEM, which can be related to the oxygen-rich character of the films.
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Affiliation(s)
- José de Jesús Araiza
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain; (J.d.J.A.); (L.Á.-F.); (R.G.)
- Unidad Académica de Física, Universidad Autónoma de Zacatecas, Calzada Solidaridad Esq, Paseo La Bufa, Fracc, Progreso, Zacatecas 98060, Mexico
| | - Leo Álvarez-Fraga
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain; (J.d.J.A.); (L.Á.-F.); (R.G.)
| | - Raúl Gago
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain; (J.d.J.A.); (L.Á.-F.); (R.G.)
| | - Olga Sánchez
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain; (J.d.J.A.); (L.Á.-F.); (R.G.)
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Optical, morphological, electrical properties of ZnO-TiO2-SnO2/CeO2 semiconducting ternary nanocomposite. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.02.042] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Li M, Liu Y, Lin X, Tan J, Yang S, Li H. One-step upgrading of bio-based furfural to γ-valerolactone via HfCl 4-mediated bifunctional catalysis. RSC Adv 2021; 11:35415-35424. [PMID: 35493184 PMCID: PMC9043276 DOI: 10.1039/d1ra05637a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 10/15/2021] [Indexed: 12/21/2022] Open
Abstract
The one-pot multi-step conversion of biomass-derived furfural to γ-valerolactone (GVL) with 64.5% yield is achieved via acid–base bifunctional catalysis enabled by HfCl4 in 2-propanol, and the recovered solid is active for transfer hydrogenation.
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Affiliation(s)
- Mingrui Li
- State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for R&D of Fine Chemicals, Guizhou University, Guiyang, Guizhou 550025, China
| | - Yixuan Liu
- State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for R&D of Fine Chemicals, Guizhou University, Guiyang, Guizhou 550025, China
| | - Xialing Lin
- State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for R&D of Fine Chemicals, Guizhou University, Guiyang, Guizhou 550025, China
| | - Jinyu Tan
- State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for R&D of Fine Chemicals, Guizhou University, Guiyang, Guizhou 550025, China
| | - Song Yang
- State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for R&D of Fine Chemicals, Guizhou University, Guiyang, Guizhou 550025, China
| | - Hu Li
- State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for R&D of Fine Chemicals, Guizhou University, Guiyang, Guizhou 550025, China
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Senthilkumar P, Babu S, Jaishree V, Joshua Stephen K, Yaswant G, Ranjith Santhosh Kumar DS, Nair NS. Solvothermal-assisted green synthesis of hybrid Chi-Fe 3O 4 nanocomposites: a potential antibacterial and antibiofilm material. IET Nanobiotechnol 2020; 14:714-721. [PMID: 33108329 DOI: 10.1049/iet-nbt.2020.0056] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
In this present study, a hybrid Chi-Fe3O4 was prepared, characterised and evaluated for its antibacterial and antibiofilm potential against Staphylococcus aureus and Staphylococcus marcescens bacterial pathogens. Intense peak around 260 nm in the ultraviolet-visible spectrum specify the formation of magnetite nanoparticles. Spherical-shaped particles with less agglomeration and particle size distribution of 3.78-46.40 nm were observed using transmission electron microscopy analysis and strong interaction of chitosan with the surface of magnetite nanoparticles was studied using field emission scanning microscopy (FESEM). X-ray diffraction analysis exhibited the polycrystalline and spinel structure configuration of the nanocomposite. Presence of Fe and O, C and Cl elements were confirmed using energy dispersive X-ray microanalysis. Fourier transform infrared spectroscopic analysis showed the reduction and formation of Chi-Fe3O4 nanocomposite. The antibacterial activity by deformation of the bacterial cell walls on treatment with Chi-Fe3O4 nanocomposite and its interaction was visualised using FESEM and the antibiofilm activity was determined using antibiofilm assay. In conclusion, this present study shows the green synthesis of Chi-Fe3O4 nanocomposite and evaluation of its antibacterial and antibiofilm potential, proving its significance in medical and biological applications.
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Affiliation(s)
- Palanisamy Senthilkumar
- Department of Biotechnology, Kongunadu Arts and Science College, Coimbatore, Tamil Nadu, India.
| | - Sudhagar Babu
- Department of Biotechnology, PSG College of Arts and Science, Coimbatore, Tamil Nadu, India
| | - Venkatachalam Jaishree
- Department of Biotechnology, Kongunadu Arts and Science College, Coimbatore, Tamil Nadu, India
| | - Kingsly Joshua Stephen
- Department of Biotechnology, Kongunadu Arts and Science College, Coimbatore, Tamil Nadu, India
| | - Govindaraj Yaswant
- Department of Biotechnology, Kongunadu Arts and Science College, Coimbatore, Tamil Nadu, India
| | | | - Nithya S Nair
- School of Biotechnology, Dr. G R Damodaran College of Science, Coimbatore, Tamil Nadu, India
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Senthilkumar P, Yaswant G, Kavitha S, Chandramohan E, Kowsalya G, Vijay R, Sudhagar B, Kumar DSRS. Preparation and characterization of hybrid chitosan-silver nanoparticles (Chi-Ag NPs); A potential antibacterial agent. Int J Biol Macromol 2019; 141:290-298. [PMID: 31476395 DOI: 10.1016/j.ijbiomac.2019.08.234] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Revised: 08/11/2019] [Accepted: 08/28/2019] [Indexed: 12/14/2022]
Abstract
In this study, a novel ecofriendly chitosan- silver nanoparticles hybrid was developed. Biological method using leaf extract of T. portulacifolium was used as reducing agent for its synthesis and the antibacterial efficiency of these hybrid nanoparticles were evaluated against the bacteria E. coli and S. marcescens organisms. The intense peak observed around 419 nm in the UV-Vis indicates the formation of silver nanoparticles. The XRD analysis showed that the hybrid chitosan-silver nanoparticles have a polycrystalline and face-centered cubic configuration. FTIR spectrum hybrid chitosan-silver nanoparticles indicated speaks vibration of NH and OH. The EDS analysis confirmed the presence of Ag, O, C and N elements in the prepared sample. The spherical shape was obtained from TEM analysis and it indicated that with average particles around 3.24 nm to 44.80 nm. The prepared hybrid chitosan-silver nanoparticles showed significant antibacterial activities against E. coli and S. marcescens. In addition, the surface membrane damages and surface morphology of test pathogens were visualized using FESEM analysis.
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Affiliation(s)
- P Senthilkumar
- PG and Research Department of Biotechnology, Kongunadu Arts and Science College, Coimbatore 641 029, Tamilnadu, India.
| | - G Yaswant
- PG and Research Department of Biotechnology, Kongunadu Arts and Science College, Coimbatore 641 029, Tamilnadu, India
| | - S Kavitha
- PG and Research Department of Biotechnology, Kongunadu Arts and Science College, Coimbatore 641 029, Tamilnadu, India
| | - E Chandramohan
- PG and Research Department of Biotechnology, Kongunadu Arts and Science College, Coimbatore 641 029, Tamilnadu, India
| | - G Kowsalya
- PG and Research Department of Biotechnology, Kongunadu Arts and Science College, Coimbatore 641 029, Tamilnadu, India
| | - R Vijay
- PG and Research Department of Biotechnology, Kongunadu Arts and Science College, Coimbatore 641 029, Tamilnadu, India
| | - B Sudhagar
- Department of Biotechnology, PSG College of Arts and Science, Coimbatore, Tamilnadu, India
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