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García J, Gutiérrez R, González AS, Jiménez-Ramirez AI, Álvarez Y, Vega V, Reith H, Leistner K, Luna C, Nielsch K, Prida VM. Exchange Bias Effect of Ni@(NiO,Ni(OH) 2) Core/Shell Nanowires Synthesized by Electrochemical Deposition in Nanoporous Alumina Membranes. Int J Mol Sci 2023; 24:ijms24087036. [PMID: 37108198 PMCID: PMC10138631 DOI: 10.3390/ijms24087036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 04/06/2023] [Accepted: 04/09/2023] [Indexed: 04/29/2023] Open
Abstract
Tuning and controlling the magnetic properties of nanomaterials is crucial to implement new and reliable technologies based on magnetic hyperthermia, spintronics, or sensors, among others. Despite variations in the alloy composition as well as the realization of several post material fabrication treatments, magnetic heterostructures as ferromagnetic/antiferromagnetic coupled layers have been widely used to modify or generate unidirectional magnetic anisotropies. In this work, a pure electrochemical approach has been used to fabricate core (FM)/shell (AFM) Ni@(NiO,Ni(OH)2) nanowire arrays, avoiding thermal oxidation procedures incompatible with integrative semiconductor technologies. Besides the morphology and compositional characterization of these core/shell nanowires, their peculiar magnetic properties have been studied by temperature dependent (isothermal) hysteresis loops, thermomagnetic curves and FORC analysis, revealing the existence of two different effects derived from Ni nanowires' surface oxidation over the magnetic performance of the array. First of all, a magnetic hardening of the nanowires along the parallel direction of the applied magnetic field with respect their long axis (easy magnetization axis) has been found. The increase in coercivity, as an effect of surface oxidation, has been observed to be around 17% (43%) at 300 K (50 K). On the other hand, an increasing exchange bias effect on decreasing temperature has been encountered when field cooling (3T) the oxidized Ni@(NiO,Ni(OH)2) nanowires below 100 K along their parallel lengths.
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Affiliation(s)
- Javier García
- Departamento de Física, Facultad de Ciencias, Universidad de Oviedo, C/Federico García Lorca 18, 33007 Oviedo, Spain
| | - Ruth Gutiérrez
- Departamento de Física, Facultad de Ciencias, Universidad de Oviedo, C/Federico García Lorca 18, 33007 Oviedo, Spain
| | - Ana S González
- Departamento de Física, Facultad de Ciencias, Universidad de Oviedo, C/Federico García Lorca 18, 33007 Oviedo, Spain
| | - Ana I Jiménez-Ramirez
- Departamento de Física, Facultad de Ciencias, Universidad de Oviedo, C/Federico García Lorca 18, 33007 Oviedo, Spain
| | - Yolanda Álvarez
- Departamento de Física, Facultad de Ciencias, Universidad de Oviedo, C/Federico García Lorca 18, 33007 Oviedo, Spain
| | - Víctor Vega
- Laboratorio de Membranas Nanoporosas, Edificio de Servicios Científico Técnicos "Severo Ochoa", Universidad de Oviedo, C/Fernando Bonguera s/n, 33006 Oviedo, Spain
| | - Heiko Reith
- Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
| | - Karin Leistner
- Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
- Electrochemical Sensors and Energy Storage, Faculty of Natural Sciences, Institute of Chemistry, TU Chemnitz, Strasse der Nationen 62, 09111 Chemnitz, Germany
| | - Carlos Luna
- Facultad de Ciencias Físico Matemáticas (FCFM), Universidad Autónoma de Nuevo León (UANL), Av. Universidad S/N, San Nicolás de los Garza 66455, Nuevo León, Mexico
| | - Kornelius Nielsch
- Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
| | - Víctor M Prida
- Departamento de Física, Facultad de Ciencias, Universidad de Oviedo, C/Federico García Lorca 18, 33007 Oviedo, Spain
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Xu W, Ma Y, Wei X, Gong H, Zhao X, Qin Y, Peng Q, Hou Z. Core–shell Co@CoO catalysts for the hydroformylation of olefins. NEW J CHEM 2022. [DOI: 10.1039/d2nj02797f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Co@CoO core–shell nanoparticles featured as metal Co(0) cores wrapped by CoO shells were constructed via a solvent-thermal process in deep eutectic solvents and showed superior activity and stability for the hydroformylation of olefins.
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Affiliation(s)
- Wen Xu
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237, China
| | - Yuan Ma
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237, China
| | - Xinjia Wei
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237, China
| | - Honghui Gong
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237, China
| | - Xiuge Zhao
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237, China
| | - Yuxi Qin
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237, China
| | - Qingpo Peng
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237, China
| | - Zhenshan Hou
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237, China
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Influence of Pore-Size/Porosity on Ion Transport and Static BSA Fouling for TiO2-Covered Nanoporous Alumina Membranes. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11125687] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The influence of geometrical parameters (pore radii and porosity) on ion transport through two almost ideal nanoporous alumina membranes (NPAMs) coated with a thin TiO2 layer by the atomic layer deposition technique (Sf-NPAM/TiO2 and Ox-NPAM/TiO2 samples) was analyzed by membrane potential and electrochemical impedance spectroscopy measurements. The results showed the significant effect of pore radii (10 nm for Sf-NPAM/TiO2 and 13 nm for Ox-NPAM/TiO2) when compared with porosity (9% and 6%, respectively). Both electrochemical techniques were also used for estimation of protein (bovine serum albumin or BSA) static fouling, and the results seem to indicate deposition of a BSA layer on the Sf-NPAM/TiO2 fouled membrane surface but pore-wall deposition in the case of the fouled Ox-NPAM/TiO2 sample. Moreover, a typical and simple optical technique such as light transmission/reflection (wavelength ranging between 0 and 2000 nm) was also used for membrane analysis, showing only slight transmittance differences in the visible region when both clean membranes were compared. However, a rather significant transmittance reduction (~18%) was observed for the fouled Sf-NPAM/TiO2 sample compared to the fouled Ox-NPAM/TiO2 sample, and was associated with BSA deposition on the membrane surface, thus supporting the electrochemical analysis results.
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Andersen IM, Rodríguez LA, Bran C, Marcelot C, Joulie S, Hungria T, Vazquez M, Gatel C, Snoeck E. Exotic Transverse-Vortex Magnetic Configurations in CoNi Nanowires. ACS NANO 2020; 14:1399-1405. [PMID: 31825584 DOI: 10.1021/acsnano.9b07448] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The magnetic configurations of cylindrical Co-rich CoNi nanowires have been quantitatively analyzed at the nanoscale by electron holography and correlated to local structural and chemical properties. The nanowires display grains of both face-centered cubic (fcc) and hexagonal close packed (hcp) crystal structures, with grain boundaries parallel to the nanowire axis direction. Electron holography evidences the existence of a complex exotic magnetic configuration characterized by two distinctly different types of magnetic configurations within a single nanowire: an array of periodical vortices separating small transverse domains in hcp-rich regions with perpendicular easy axis orientation and a mostly axial configuration parallel to the nanowire axis in regions with fcc grains. These vastly different domains are found to be caused by local variations in the chemical composition modifying the crystalline orientation and/or structure, which give rise to change in magnetic anisotropies. Micromagnetic simulations, including the structural properties that have been experimentally determined, allow for a deeper understanding of the complex magnetic states observed by electron holography.
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Affiliation(s)
- Ingrid Marie Andersen
- Centre d'Elaboration de Matériaux et d'Etudes Structurales-CNRS , 29 Jeanne Marvig , 31055 Toulouse , France
| | - Luis Alfredo Rodríguez
- Centro de Excelencia en Nuevos Materiales , Universidad del Valle , A.A. 25360 Cali , Colombia
- Department of Physics , Universidad del Valle , A.A. 25360 Cali , Colombia
| | - Cristina Bran
- Instituto de Ciencia de Materiales de Madrid-CSIC , 28049 Madrid , Spain
| | - Cécile Marcelot
- Centre d'Elaboration de Matériaux et d'Etudes Structurales-CNRS , 29 Jeanne Marvig , 31055 Toulouse , France
| | - Sébastien Joulie
- Centre d'Elaboration de Matériaux et d'Etudes Structurales-CNRS , 29 Jeanne Marvig , 31055 Toulouse , France
| | - Teresa Hungria
- Centre de Microcaractérisation Raimond CASTAING , Université de Toulouse, CNRS, UT3 - Paul Sabatier, INP, INSA , Espace Clément Ader, 3 Rue Caroline Aigle , 31400 Toulouse , France
| | - Manuel Vazquez
- Instituto de Ciencia de Materiales de Madrid-CSIC , 28049 Madrid , Spain
| | - Christophe Gatel
- Centre d'Elaboration de Matériaux et d'Etudes Structurales-CNRS , 29 Jeanne Marvig , 31055 Toulouse , France
| | - Etienne Snoeck
- Centre d'Elaboration de Matériaux et d'Etudes Structurales-CNRS , 29 Jeanne Marvig , 31055 Toulouse , France
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Orientation Growth and Magnetic Properties of Electrochemical Deposited Nickel Nanowire Arrays. Catalysts 2019. [DOI: 10.3390/catal9020152] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Highly ordered ferromagnetic metal nanowire arrays with preferred growth direction show potential applications in electronic and spintronic devices. In this work, by employing a porous anodic aluminum oxide template-assisted electrodeposition method, we successfully prepared Ni nanowire arrays. Importantly, the growth direction of Ni nanowire arrays can be controlled by varying the current densities. The crystalline and growth orientation of Ni nanowire arrays show effects on magnetic properties. Single-crystallinity Ni nanowires with [110] orientation show the best magnetic properties, including coercivity and squareness, along the parallel direction of the nanowire axis. The current preparation strategy can be used to obtain other nanowire arrays (such as metal, alloy, and semiconductor) with controlled growth direction in confined space, and is therefore of broad interest for different applications.
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Saeki R, Ohgai T. Effect of Growth Rate on the Crystal Orientation and Magnetization Performance of Cobalt Nanocrystal Arrays Electrodeposited from Aqueous Solution. NANOMATERIALS 2018; 8:nano8080566. [PMID: 30042366 PMCID: PMC6116207 DOI: 10.3390/nano8080566] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 07/15/2018] [Accepted: 07/19/2018] [Indexed: 11/16/2022]
Abstract
The formation work of a two-dimensional hcp-Co (metallic cobalt crystal with hexagonal close packed structure) nucleus, Whkl, was calculated by Pangarov's theory. W002 was estimated to be smaller than W100 in a cathode potential range nobler than the transition potential, Etra (ca. -0.77 V vs. Ag/AgCl). To confirm the above estimation, ferromagnetic nanocomposite thick films, which contained (002) textured hcp-Co nanocrystal arrays, were synthesized by potentiostatic electrochemical reduction of Co2+ ions in anodized aluminum oxide (AAO) nanochannel films with ca. 45 µm thickness. The aspect ratio of hcp-Co nanocrystals with a diameter of ca. 25 nm reached up to ca. 1800. Our experimental results revealed that the texture coefficient, TC002, increased when decreasing the overpotential for hcp-Co electrodeposition by shifting the cathode potential nobler than Etra. In a similar way, TC002 increased sharply by decreasing the growth rate of the hcp-Co nanocrystals so that it was smaller than the transition growth rate, Rtra (ca. 600 nm s-1). The perpendicular magnetization performance was observed in AAO nanocomposite films containing hcp-Co nanocrystal arrays. With increasing TC002, the coercivity of the nanocomposite film increased and reached up to 1.66 kOe, with a squareness of ca. 0.9 at room temperature.
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Affiliation(s)
- Ryusei Saeki
- Graduate School of Engineering, Nagasaki University, Bunkyo-machi 1-14, Nagasaki 852-8521, Japan.
| | - Takeshi Ohgai
- Faculty of Engineering, Nagasaki University, Bunkyo-machi 1-14, Nagasaki 852-8521, Japan.
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Shih PH, Li TY, Yeh YC, Wu SY. Phonon Confinement Induced Non-Concomitant Near-Infrared Emission along a Single ZnO Nanowire: Spatial Evolution Study of Phononic and Photonic Properties. NANOMATERIALS 2017; 7:nano7110353. [PMID: 29143773 PMCID: PMC5707570 DOI: 10.3390/nano7110353] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 10/18/2017] [Accepted: 10/24/2017] [Indexed: 11/23/2022]
Abstract
The impact of mixed defects on ZnO phononic and photonic properties at the nanoscale is only now being investigated. Here we report an effective strategy to study the distribution of defects along the growth direction of a single ZnO nanowire (NW), performed qualitatively as well as quantitatively using energy dispersive spectroscopy (EDS), confocal Raman-, and photoluminescence (PL)-mapping technique. A non-concomitant near-infrared (NIR) emission of 1.53 ± 0.01 eV was observed near the bottom region of 2.05 ± 0.05 μm along a single ZnO NW and could be successfully explained by the radiative recombination of shallowly trapped electrons VO** with deeply trapped holes at VZn″. A linear chain model modified from a phonon confinement model was used to describe the growth of short-range correlations between the mean distance of defects and its evolution with spatial position along the axial growth direction by fitting the E2H mode. Our results are expected to provide new insights into improving the study of the photonic and photonic properties of a single nanowire.
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Affiliation(s)
- Po-Hsun Shih
- Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan.
| | - Tai-Yue Li
- Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan.
| | - Yu-Chen Yeh
- Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan.
| | - Sheng Yun Wu
- Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan.
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Nath K, Sinha J, Ali MA, Banerjee SS. Evidence of magneto-structural coupling affecting magnetic anisotropy in a cobalt nano-composite. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:425804. [PMID: 28786819 DOI: 10.1088/1361-648x/aa84e5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
By investigating temperature dependent structural and magnetic properties of cobalt (Co) embedded within nanoporous anodized alumina template, we observe changes in the easy axis of Co magnetization and an unusual increase in its saturation magnetization below a temperature T cr. Analysis of our M(H) data reveals that the magnetized volume of the sample increases rapidly as T falls below T cr. To understand these features we perform micro-magnetic simulations for a single Co-nanopillar wherein by varying its magneto-crystalline anisotropy energy we are able to show that the changes observed near T cr are related to the changes in the magnetic anisotropy of the nanopillar. We propose crystallographic structural distortions trigger changes in the balance between shape and magneto-crystalline anisotropy in our nanopillar. Our results suggest interplay between magnetism, structure and magnetic anisotropy in low dimensional Co-nanopillars, which can be modified with temperature of the system.
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Affiliation(s)
- Kamalika Nath
- Department of Physics, Indian Institute of Technology, Kanpur 208016, U.P., India
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Shih PH, Wu SY. Growth Mechanism Studies of ZnO Nanowires: Experimental Observations and Short-Circuit Diffusion Analysis. NANOMATERIALS 2017; 7:nano7070188. [PMID: 28754030 PMCID: PMC5535254 DOI: 10.3390/nano7070188] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 07/18/2017] [Accepted: 07/18/2017] [Indexed: 11/16/2022]
Abstract
Plenty of studies have been performed to probe the diverse properties of ZnO nanowires, but only a few have focused on the physical properties of a single nanowire since analyzing the growth mechanism along a single nanowire is difficult. In this study, a single ZnO nanowire was synthesized using a Ti-assisted chemical vapor deposition (CVD) method to avoid the appearance of catalytic contamination. Two-dimensional energy dispersive spectroscopy (EDS) mapping with a diffusion model was used to obtain the diffusion length and the activation energy ratio. The ratio value is close to 0.3, revealing that the growth of ZnO nanowires was attributed to the short-circuit diffusion.
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Affiliation(s)
- Po-Hsun Shih
- Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan.
| | - Sheng Yun Wu
- Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan.
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