Interfacial multi-reflection in barium ferrite nanosheets/ amorphous carbon nanotube composites for effective electromagnetic shielding applications

Mu, Dawei; Chen, Zihao; Liu, Tianhao; Zhang, He; Zhang, Yi; Zuo, Xiaochao; Ouyang, Jing

doi:10.1016/j.matchemphys.2021.124606

Cited by 9 publications

(6 citation statements)

References 50 publications

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“…Mu et al. (2021), [81] studying the multireflection interface in barium ferrite nanosheets/amorphous carbon nanotube compounds for effective electromagnetic shielding applications, reached only −6.11 dB at 6.80 GHz when using a 4 : 1 ratio of ferrite/carbon nanotube. It is worth noting that these two materials used in the mentioned work are widely studied due to their good efficiency in electromagnetic shielding.…”

Section: Resultsmentioning

confidence: 99%

Thermal, Magnetic and Electrical Properties of PMMA Nanocomposites with Manganese and Zinc Ferrite Nanoparticles and Their Functionalization

Marques

2022

ChemistrySelect

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Manganese (MnFe 2 O 4 ) and zinc (ZnFe 2 O 4 ) ferrite nanoparticles were synthesized by the combustion method. Furthermore, the modification of these particles with a silane compound was performed. Thus, the particles produced were analyzed for morphology using Scanning electron microscopy (SEM), thermal stability, and composition assisted by Thermogravimetric analysis (TGA). It is noteworthy that the present work used an unprecedented Far-Fourier-transform infrared spectroscopy (Far-FTIR) technique to differentiate the types of ferrites and their surface functionalization, as it is a simpler, more efficient, and high-resolution method. It is worth mentioning that there are few comparative studies of zinc and manganese ferrites in the literature, much less distinguishing these ferrites simply and efficiently. In addition, there is also a lack of scientific knowledge about its chemical functionalization as compatibilization, especially silanization. Novel PMMA nanocomposites were prepared with the different synthesized particles in the contents from 0.1 % to 1.0 wt.% by the in situ polymerization technique. The nanocomposites were characterized by the analysis of SEM, TGA, Differential scanning calorimetry (DSC), and FTIR mainly by their morphology, thermal resistance, glass transition temperature, proving the chemical interactions, electrical conductivity, capacitance, and dielectric constant. Furthermore, it was evidenced that, in addition to the improvements in thermal, electrical, and interface properties, the produced nanocomposites showed excellent electromagnetic shielding properties even at low filler contents. It is noteworthy that the capacitance increases 63 % for the composite with 1.0 % zinc ferrite and 43 % for manganese ferrite. Also, the electromagnetic absorption results proved that even the low filler contents tested in this work, up to 1.0 %, presented an excellent potential for applying as electromagnetic shielding materials, reaching up to 70 % attenuation with the use of zinc ferrite. Both ferrites showed excellent results, even superior to those found in the literature for other particles with the same purposes, and still needed a lower content to achieve excellent results.

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Section: Resultsmentioning

confidence: 99%

Thermal, Magnetic and Electrical Properties of PMMA Nanocomposites with Manganese and Zinc Ferrite Nanoparticles and Their Functionalization

Marques

2022

ChemistrySelect

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“…While there is no exact SE, SEA, or SER value that determines an effective EMI shield, there are generally accepted thresholds. For absorbing shields, SEA, or power absorption in general, should be at least 10 dB (90%), [6][7][8] or even 20 dB (99%). [1,12] SER should then be minimized such that is significantly smaller than SEA.…”

Section: Measurement and Characterizationmentioning

confidence: 99%

“…To be an effective absorber, the shielding material must have high electrical and/or magnetic losses. [7,8] Strongly absorbing shielding composites with low reflection have been explored at millimeter wave frequencies, achieving over 30 dB absorption from 40 to 90 GHz. [9] However, the best performing absorbers require complex, expensive particle, and film fabrication processes.…”

Section: Introductionmentioning

confidence: 99%

Barium Ferrite/Carbon Nanotube Nanocomposites for Millimeter‐Wave Electromagnetic Shielding Enhanced by Ferromagnetic Resonance Absorption

Mears,

Freeman,

Yoon

et al. 2024

Adv Eng Mater

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In this work, we report a composite of barium ferrite (BaM) and multiwalled carbon nanotubes (CNTs) in a polymer matrix of polydimethylsiloxane (PDMS) for the purpose of suppressing electromagnetic interference (EMI). Shielding is accomplished primarily through absorption, which arises from a combination of the ferromagnetic resonance (FMR) from the BaM and conductive losses from the CNTs. The composite is fabricated by mixing commercially available BaM nanoparticles and CNTs into PDMS, screen printing the mixture into molds, then curing at 80 °C in a DC magnetic field. Characterization involves placing the composite in the cross‐section of a rectangular waveguide, then using a vector network analyzer (VNA) to measure scattering (S) parameters from 33‐50 GHz. Using the measured S parameters, power reflected and absorbed can be calculated and used to characterize the composite’s shielding effectiveness (SE), and the complex permittivity and permeability can be determined. The resulting 2.4‐mm‐thick composite shows a peak absorption of 26.9 dB at the FMR frequency of 47.4 GHz. When normalized for thickness, the composite, on average, absorbs 11.3 dB/mm and operates at a higher frequency than other shielding composites found in the literature.This article is protected by copyright. All rights reserved.

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“…The diverse template methods to prepare aCNTs are summarized in Table 2. The common templates are V 3 O 7 •H 2 O [19], anodic alumina oxide membrane (AAOs) [33][34][35][36], sulfonated polymer nanotubes [37], polyvinyl pyrrolidone (PVP) [38], ZnO nanowires [39], SnO 2 nanowires [40], sulfonated polymer nanotubes [41], polycarbonate (PC) membrane filters [42], aligned TiO 2 nanotubes [43], and halloysite [44].…”

Section: Templatementioning

confidence: 99%

“…polymer nanotubes [37], polyvinyl pyrrolidone (PVP) [38], ZnO nanowires [39], SnO2 nanowires [40], sulfonated polymer nanotubes [41], polycarbonate (PC) membrane filters [42], aligned TiO2 nanotubes [43], and halloysite [44].…”

Section: Templatementioning

confidence: 99%

State-of-the-Art Review on Amorphous Carbon Nanotubes: Synthesis, Structure, and Application

Ren,

Hussain,

Chang

et al. 2023

IJMS

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Carbon nanotubes (CNTs) have rapidly received increasing attention and great interest as potential materials for energy storage and catalyst fields, which is due to their unique physicochemical and electrical properties. With continuous improvements in fabrication routes, CNTs have been modified with various types of materials, opening up new perspectives for research and state-of-the-art technologies. Amorphous CNTs (aCNTs) are carbon nanostructures that are distinctively different from their well-ordered counterparts, such as single-walled and multi-walled carbon nanotubes (SWCNTs and MWCNTs, respectively), while the atoms in aCNTs are grouped in a disordered, crystalline/non-crystalline manner. Owing to their unique structure and properties, aCNTs are attractive for energy storage, catalysis, and aerospace applications. In this review, we provide an overview of the synthetic routes of aCNTs, which include chemical vapor deposition, catalytic pyrolysis, and arc discharge. Detailed morphologies of aCNTs and the systematic elucidation of tunable properties are also summarized. Finally, we discuss the future perspectives as well as associated challenges of aCNTs. With this review, we aim to encourage further research for the widespread use of aCNTs in industry.

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Interfacial multi-reflection in barium ferrite nanosheets/ amorphous carbon nanotube composites for effective electromagnetic shielding applications

Cited by 9 publications

References 50 publications

Thermal, Magnetic and Electrical Properties of PMMA Nanocomposites with Manganese and Zinc Ferrite Nanoparticles and Their Functionalization

Thermal, Magnetic and Electrical Properties of PMMA Nanocomposites with Manganese and Zinc Ferrite Nanoparticles and Their Functionalization

Barium Ferrite/Carbon Nanotube Nanocomposites for Millimeter‐Wave Electromagnetic Shielding Enhanced by Ferromagnetic Resonance Absorption

State-of-the-Art Review on Amorphous Carbon Nanotubes: Synthesis, Structure, and Application

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