Amorphous FexCo1–x Wire-like Nanostructures Manufactured through Surfactant-Free Magnetic-Field-Induced Synthesis

Krajewski, Marcin; Liou, Sz‐Chian; Chiou, Wen‐An; Tokarczyk, Mateusz; Małolepszy, Artur; Płocińska, Magdalena; Witecka, Agnieszka; Lewińska, S.; Ślawska‐Waniewska, A.

doi:10.1021/acs.cgd.0c00070

Cited by 7 publications

(8 citation statements)

References 71 publications

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“…[11,24,25] So far, it has been proven that the magnetic-field-induced synthesis is a process which mainly leads to the formation of magnetic metallic 1D nanostructures. [27][28][29] For example, Krajewski et al fabricated wirelike amorphous FeCo nanostructures through a simple one-step magnetic-field-induced chemical reduction method. [27] Wang et al fabricated 1D Fe 3 O 4 /C composite microrods via a facile one-pot solvothermal reaction in the presence of an external magnetic field.…”

Section: Electromagnetic (Em) Wave Absorption Materials Have Attractementioning

confidence: 99%

“…[ 27–29 ] For example, Krajewski et al fabricated wire‐like amorphous FeCo nanostructures through a simple one‐step magnetic‐field‐induced chemical reduction method. [ 27 ] Wang et al fabricated 1D Fe 3 O 4 /C composite microrods via a facile one‐pot solvothermal reaction in the presence of an external magnetic field. [ 29 ] However, the measured EM parameters are related to polymer composites with random distributions of 1D magnetic samples, which somewhat diminish the complex permeability and result in a negative effect on EM wave absorption properties.…”

Section: Introductionmentioning

confidence: 99%

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Galvanic Replacement Reaction Involving Core–Shell Magnetic Chains and Orientation‐Tunable Microwave Absorption Properties

Zhao

Zeng

et al. 2020

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Electromagnetic (EM) wave absorption materials have attracted considerable attention because of EM wave pollution caused by the proliferation of electronic communication devices. One‐dimentional (1D) structural magnetic metals have potential as EM absorption materials. However, fabricating 1D core–shell bimetallic magnetic species is a significant challenge. Herein, 1D core–shell bimetallic magnetic chains are successfully prepared through a modified galvanic replacement reaction under an external magnetic field, which could facilitate the preparation of 1D core–shell noble magnetic chains. By delicately designing the orientation of bimetallic magnetic chains in polyvinylidene fluoride, the composites reveal the decreased complex permittivity and increased permeability compared with random counterparts. Thus, elevated EM wave absorption perfromances including an optimal reflection loss of −43.5 dB and an effective bandwidth of 7.3 GHz could be achieved for the oriented Cu@Co sample. Off‐axis electron holograms indicate that the augmented magnetic coupling and remarkable polarization loss primarily contribute to EM absorption in addition to the antenna effect of the 1D structure to scatter microwaves and ohmic loss of the metallic attribute. This work can serve a guide to construct 1D core–shell bimetallic magnetic nanostructures and design magnetic configuration in polymer to tune EM parameters and strengthen EM absorption properties.

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Section: Electromagnetic (Em) Wave Absorption Materials Have Attractementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Galvanic Replacement Reaction Involving Core–Shell Magnetic Chains and Orientation‐Tunable Microwave Absorption Properties

Zhao

Zeng

et al. 2020

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143

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“…Krajewski et al [10] studied a new technology of magnetic field-induced synthesis of magnetic Fe-Co alloy (Fe 0.75 Co 0.25 , Fe 0.50 Co 0.50 and Fe 0.25 Co 0.75 ) linear nanochains (Figure 1), using NaBH 4 aqueous solution as reducing agent, through a simple one-step magnetic fieldinduced chemical cooperative reduction reaction of three different concentrations of Fe 2+ and Co 2+ ion precursor solutions, to prepare the amorphous bimetallic Fe Co linear nanostructures with ideal Fe/CO ratio which have special bimetallic alloy core and very thin oxide shell structure. The Fe-Co alloy material is a ferromagnetic material, and its magnetic properties are related to its structural properties and chemical composition.…”

Section: Metal Nanomaterialsmentioning

confidence: 99%

“…Fig1. SEM images of (a) Fe, (b) Fe0.75Co0.25, (c) Fe0.50Co0.50, (d) Fe0.25Co0.75 wire-like nanostructures, and (e) Co nanoparticles [10] 3 Oxide nanomaterials Li et al [11] used one-step thermal decomposition route to rapidly synthesize octahedral magnetite (Fe 3 O 4 ) nanocrystals. Through adjusting the ratio of precursor to surfactant, the average particle size can be well controlled from 8nm to 430nm.…”

Section: Metal Nanomaterialsmentioning

confidence: 99%

Research Progress in Ordered Nanomaterials via Magnetic Field Induced Preparation

Wang

et al. 2020

E3S Web Conf.

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Ordered nanomaterials are widely concerned for their excellent performance in mechanics, electricity, optics and magnetism. Magnetic field induced self-assembly is widely used for the preparation of ordered nanomaterials, which has the advantages of indirect contact with the reaction system, controllable adjustment of magnetic field. By using this preparation method, it can realize the alignment of nanomaterials without affecting the comprehensive performance of each component in the system. In this paper, we reviewed magnetic field induced self-assembly of metal nanomaterials, oxide nanomaterials and nanocomposites. We also looked forward to the future research direction.

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“…The usage of NaBH 4 as the reducing agent in precipitation method usually leads to the formation of nanoparticles [ 3 , 9 , 10 , 11 , 12 , 13 ]. However, it has been recently demonstrated that the presence of an external magnetic field during the synthesis of iron and/or cobalt nanoparticles can cause their alignment and results in the formation of iron, cobalt or iron–cobalt Wire-like nanostructures [ 14 , 15 , 16 , 17 ]. Their morphologies and structural properties are very specific because they look like long chains of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Structural and Magnetic Properties of Fe-Co Wire-like Nanochains Caused by Annealing Atmosphere

et al. 2021

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Thermal treatment is a post-synthesis treatment that aims to improve the crystallinity and interrelated physical properties of as-prepared materials. This process may also cause some unwanted changes in materials like their oxidation or contamination. In this work, we present the post-synthesis annealing treatments of the amorphous Fe1−xCox (x = 0.25; 0.50; 0.75) Wire-like nanochains performed at 400 °C in two different atmospheres, i.e., a mixture of 80% nitrogen and 20% hydrogen and argon. These processes caused significantly different changes of structural and magnetic properties of the initially-formed Fe-Co nanostructures. All of them crystallized and their cores were composed of body-centered cubic Fe-Co phase, whereas their oxide shells comprised of a mixture of CoFe2O4 and Fe3O4 phases. However, the annealing carried out in hydrogen-containing atmosphere caused a decomposition of the initial oxide shell layer, whereas a similar process in argon led to its slight thickening. Moreover, it was found that the cores of thermally-treated Fe0.25Co0.75 nanochains contained the hexagonal closest packed (hcp) Co phase and were covered by the nanosheet-like shell layer in the case of annealing performed in argon. Considering the evolution of magnetic properties induced by structural changes, it was observed that the coercivities of annealed Fe-Co nanochains increased in comparison with their non-annealed counterparts. The saturation magnetization (MS) of the Fe0.25Co0.75 nanomaterial annealed in both atmospheres was higher than that for the non-annealed sample. In turn, the MS of the Fe0.75Co0.25 and Fe0.50Co0.50 nanochains annealed in argon were lower than those recorded for non-annealed samples due to their partial oxidation during thermal processing.

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Amorphous Fe_xCo_1–x Wire-like Nanostructures Manufactured through Surfactant-Free Magnetic-Field-Induced Synthesis

Cited by 7 publications

References 71 publications

Galvanic Replacement Reaction Involving Core–Shell Magnetic Chains and Orientation‐Tunable Microwave Absorption Properties

Galvanic Replacement Reaction Involving Core–Shell Magnetic Chains and Orientation‐Tunable Microwave Absorption Properties

Research Progress in Ordered Nanomaterials via Magnetic Field Induced Preparation

Evolution of Structural and Magnetic Properties of Fe-Co Wire-like Nanochains Caused by Annealing Atmosphere

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