Synthesis and Characterization of Regular Hexagonal Fe3O4 Nanoplates

Li, Xiang; Zheng, Haotian; Xue, Yuhua; Li, Zheng-Hua; Zhu, Xiaojuan; Da, Xianhong; Li, Ruonan; Lu, Yin; Liu, Yan; Gu, Fenfen

doi:10.1134/s003602442107027x

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…The nanoparticle appears to be growing in a direction that is practically perpendicular to the substrate surface when viewed from the top of the deposited sample. It is supported by previously published Fe 3 O 4 nanostructures and their composites elesewhere 70–72 . The polycrystalline nature of the sheet‐like structure of MWCNT/Fe 3 O 4 nanoparticle is responsible for the divergence from optimum growth of the Fe 3 O 4 nanoparticle and the less‐than‐ideal c‐axis orientation (noticed in the XRD pattern).…”

Section: Resultssupporting

confidence: 73%

Enhanced microwave absorption properties of magnetite nanoparticles decorated multi walled carbon nanotubes loaded polyaniline/polyvinyl alcohol nanocomposites

Narayanasamy,

Chinnakkannu,

Sharma

et al. 2023

Polymers for Advanced Techs

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Electromagnetic radiation interference (EMI) or pollution is increased significantly in proportion to the expansion of electronic and communication industries, which lead to the disturbance of the functioning of electronic gadgets and medical equipments, in addition to the human health damage. The Microwave absorbing (MA) composite comprised of polyvinyl alcohol (PVA), polyaniline (PANI), carbon nanotube (MWCNT) and iron oxide (Fe3O4) has been developed with various proportions, denoted as PVA/PANI/MWCNT/Fe3O4 (1%, 3%, 5%). Fe3O4 was prepared using a hydrothermal method, and PVA/PANI/MWCNT/Fe3O4 (1%, 3%, 5%) nanocomposites was made by solvent casting techniques. The PVA composite films were also subjected to a range of analyses including IR, TGA, DTA, DTG, SEM, TEM, dielectric measurements and EMI shielding effectiveness (EMI SE), to describe their characteristics. The results of various studies indicate that the PVA/PANI/MWCNT/Fe3O4 (1%, 3%, 5%) composites possess enhanced thermal and dielectric characteristics, for instance the PVA/PANI/MWCNT/5% Fe3O4 blend nanocomposites possess 10% initial decomposition at 220°C and dielectric constant of 3.2 × 107 at 1 MHz. The total EMI SE value for the synthetic PVA/PANI/MWCNT/Fe3O4 was found at 9.2 and 10 GHz is 48 and 54 dB, respectively, exhibiting synergistic properties of the composites toward EMI shielding. The microwave absorption spectra indicate two absorption peaks in the region around 8 to 12 GHz, with the absorption reflection loss (RL) value of −20 dB at 10 GHz for the PVA/PANI/MWCNT/5% Fe3O4 nanocomposites.

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Section: Resultssupporting

confidence: 73%

Enhanced microwave absorption properties of magnetite nanoparticles decorated multi walled carbon nanotubes loaded polyaniline/polyvinyl alcohol nanocomposites

Narayanasamy,

Chinnakkannu,

Sharma

et al. 2023

Polymers for Advanced Techs

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“…18 The magnetic domain of Fe 3 O 4 @C nanoplates belongs to the pseudo-single domain due to a relatively low remanence ratio (remanence magnetization/saturation magnet- ization, M r /M S ) of ∼0.28. Thus, the domain wall pegging and spin pinning in the interfaces between the Fe 3 O 4 core and the C shell hinder the flipping of the domain wall and spin, which directly leads to the increase of H c. 52 Besides, the high shape anisotropy is another important reason for the enhanced H c . The M S and H c of Fe 3 O 4 @C@MoS 2 composites decrease to 10.89 emu/g and 145.33 Oe, respectively.…”

Section: Resultsmentioning

confidence: 99%

Dual Resonance Behavior and Enhanced Microwave Absorption Performance of Fe₃O₄@C@MoS₂ Composites with Shape Magnetic Anisotropy

Chen,

Xiao,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Ternary hierarchical Fe 3 O 4 @C@MoS 2 composites and binary hierarchical Fe 3 O 4 @C composites were successfully fabricated by a modified mixed solvothermal method, a self-oxidation polymerization method, and a hydrothermal process. Their magnetic properties and microwave absorption performance were investigated. Dual resonance behavior was observed in the Fe 3 O 4 @C@MoS 2 composites. One of the resonances was attributed to natural resonance with a resonance frequency of 2.58 GHz, which was much higher than that for Fe 3 O 4 bulk (1.5 GHz). The other originated from the superparamagnetic/ferromagnetic relaxation with a resonance frequency of 12.45 GHz. The minimum reflection loss (RL min ) reached −64.30 dB with a matched thickness of 2.24 mm at 11.64 GHz, and the maximum effective absorption bandwidth (EAB max ) covered 6.39 GHz with a matched thickness of 1.89 mm. In addition, the maximum Radar cross section (RCS) reduction value reached 31.90 dB m 2 at a scattering angle of 0°. Electron holography analysis confirmed a dense magnetic absorption network in the Fe 3 O 4 @C@MoS 2 composites. The boost in microwave absorption performance was caused by the synergistic effects of magnetic and dielectric properties owing to the ternary hierarchical structure, shape magnetic anisotropy, and incorporation of 1T/2H MoS 2 . Besides, the binary hierarchical Fe 3 O 4 @C composites also exhibited good absorbing performance caused by natural resonance, with an RL min of −52.90 dB at 5.80 mm, an EAB max of 5.98 GHz at 3.38 mm, and a relatively high RCS reduction value of 13.04 dB m 2 at θ = 20°. This work paves the way for designing multicomponent hierarchical absorbers with broadband and intensive microwave absorption.

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Synthesis and Characterization of Regular Hexagonal Fe3O4 Nanoplates

Cited by 2 publications

References 22 publications

Enhanced microwave absorption properties of magnetite nanoparticles decorated multi walled carbon nanotubes loaded polyaniline/polyvinyl alcohol nanocomposites

Enhanced microwave absorption properties of magnetite nanoparticles decorated multi walled carbon nanotubes loaded polyaniline/polyvinyl alcohol nanocomposites

Dual Resonance Behavior and Enhanced Microwave Absorption Performance of Fe₃O₄@C@MoS₂ Composites with Shape Magnetic Anisotropy

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Synthesis and Characterization of Regular Hexagonal Fe3O4 Nanoplates

Cited by 2 publications

References 22 publications

Enhanced microwave absorption properties of magnetite nanoparticles decorated multi walled carbon nanotubes loaded polyaniline/polyvinyl alcohol nanocomposites

Enhanced microwave absorption properties of magnetite nanoparticles decorated multi walled carbon nanotubes loaded polyaniline/polyvinyl alcohol nanocomposites

Dual Resonance Behavior and Enhanced Microwave Absorption Performance of Fe3O4@C@MoS2 Composites with Shape Magnetic Anisotropy

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Dual Resonance Behavior and Enhanced Microwave Absorption Performance of Fe₃O₄@C@MoS₂ Composites with Shape Magnetic Anisotropy