A promising broadband and thin microwave absorber based on ternary FeNi@C@polyaniline nanocomposites

Han, Dandan; Xiao, Ningru; Hu, He; Liu, Bao; Song, Gengxin; He, Yan

doi:10.1039/c5ra19816j

Cited by 20 publications

(11 citation statements)

References 47 publications

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“…Due to the high density of magnetic ferrites/metals, the improvements in EM properties by constantly accumulating magnetic components will be contrary to the requirements of practical applications, and thus employment of another dielectric medium becomes a more prospective mode that can maintain the specific gravity of the composites within the acceptable level. Generally, this kind of multi-compound CP-based composite is constructed on the basis of a simple magnetic composite, and the CPs will act as a shell layer and organic binder [ 152 , 153 , 154 , 155 , 156 , 157 , 158 , 159 , 160 , 161 , 162 , 163 ]. For example, Han et al prepared FeNi@C@PANI nanocomposite by combining the arc-discharge process and an in situ chemical polymerization reaction.…”

Section: Cp-based Composites As Mamsmentioning

confidence: 99%

“…It was found that the introduction of PANI could enhance the relative complex permittivity to some extent, and pull down the density of the composite effectively. Compared with FeNi@C, the FeNi@C@PANI nanocomposite could perform similar microwave absorption with thinner absorber thickness [ 152 ]. Yang et al also confirmed that a PPy-encapsulated nickel-coated graphite nanosheet had much better microwave absorption properties than a binary nickel-coated graphite nanosheet and a PPy-coated graphite nanosheet [ 155 ].…”

Section: Cp-based Composites As Mamsmentioning

confidence: 99%

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Recent Advances in Conjugated Polymer-Based Microwave Absorbing Materials

Wang

et al. 2017

Polymers

117

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Microwave absorbing materials (MAMs) are paving the way for exciting applications in electromagnetic (EM) pollution precaution and national defense security, as they offer an advanced alternative to conventional reflection principles to fundamentally eliminate the EM waves. Conjugated polymer (CP)-based composites appear as a promising kind of MAM with the desirable features of low density and high performance. In this review, we introduce the theory of microwave absorption and summarize recent advances in the fabrication of CP-based MAMs, including rational design of the microstructure of pure conjugated polymers and tunable chemical integration with magnetic ferrites, magnetic metals, transition metal oxides, and carbon materials. The key point of enhancing microwave absorption in CP-based MAMs is to regulate their EM properties, improve matching of characteristic impedance, and create diversified loss mechanisms. The examples presented in this review will provide new insights into the design and preparation of CP-based composites that can satisfy the high demands of the oncoming generation of MAMs.

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Section: Cp-based Composites As Mamsmentioning

confidence: 99%

Section: Cp-based Composites As Mamsmentioning

confidence: 99%

Recent Advances in Conjugated Polymer-Based Microwave Absorbing Materials

Wang

et al. 2017

Polymers

117

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“…The extra slight peak of CNF-6 sample is mainly associated with the additional interfaces between FeNi and carbon. 39,40 As we can see, complex permittivity becomes higher when carbonized time has been increased from 1 to 6 h. Nevertheless, compared with CNF-4 and CNF-6 samples, it is found that CNF-12 sample exhibit lower complex permittivity and higher complex permeability, which could be resulted from the destruction of 1D carbon nanofibers structure. 41 As can be seen in Figure 6c, these samples exhibit similar and lower relative complex permeability curves, which are related to the smaller magnetization.…”

Section: ■ Results and Discussionmentioning

confidence: 85%

Structural and Carbonized Design of 1D FeNi/C Nanofibers with Conductive Network to Optimize Electromagnetic Parameters and Absorption Abilities

Liang

et al. 2018

ACS Sustainable Chem. Eng.

170

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The optimized electromagnetic (EM) parameters are highly indispensable for outstanding microwave absorbers. Generally speaking, it is very necessary to suitably improve permittivity and permeability of the materials. The combination of magnetic/dielectric materials is a good choice. Herein, the irregular shaped FeNi/C composites were synthesized in N 2 atmosphere with unsatisfied EM parameters. To further optimize EM parameters and enhance microwave absorption abilities, constructing one-dimensional (1D) structure is also an excellent scheme. 1D FeNi/C nanofibers were successfully obtained by electrospinning technology combined with heat treatment. Enhanced microwave absorption abilities can be fulfilled by conductive network structure, better dielectric loss, and stronger interface polarization intensity. Moreover, carbonized time toward nanofibers plays a key role in microwave absorption, which could influence complex permittivity and dielectric loss of materials. It is found that FeNi/C nanofibers with highly carbonized degree display better microwave absorbing properties. The reflection loss (RL) values less than −10 dB can be observed in 12.8−17.2 GHz (a broad bandwidth of 4.4 GHz) with an absorber thickness of only 1.8 mm. The absorber with a thickness of 2.7 mm has the minimum RL value of −24.8 dB at 9.4 GHz. In this regard, these nanofibers are very likely to be used as EM-wave absorbers in practical application. Furthermore, this work provides a useful strategy to optimize electromagnetic parameters and absorption abilities of metal/carbon absorbers. It may promote the development of 1D metal/carbon composites in microwave absorption field.

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“…Fe, Co, Ni, and their alloys exhibit high magnetization and low coercivity and find applications in the EMI shielding. 7 Han et al 14 reported that nickel is suitable for microwave absorption at high frequency over gigahertz owing to the higher Snoek's limit. In this context, very limited work has been reported on RGO/Ni and RGO/Ni/polyaniline composites.…”

Section: ■ Introductionmentioning

confidence: 99%

Functionalized Graphene/Nickel/Polyaniline Ternary Nanocomposites: Fabrication and Application as Electromagnetic Wave Absorbers

2021

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The evolution of high electromagnetic absorption materials is essential in the fast growing electronic industry in overcoming electromagnetic pollution. In view of this, a series of Ni nanoparticle-decorated functionalized graphene sheets (FG/Ni) are synthesized by a solvothermal method using different ratios of FG/Ni precursors. Subsequently, FG/Ni is subjected to in situ polymerization of aniline to form FG/Ni/PANI ternary composites and characterized. The total electromagnetic interference shielding efficiency (SET) measurements on FG/Ni/PANI with an optimized FG/Ni ratio (50 mg:600 mg NiCl2·6H2O) exhibit enhanced performance, i.e., ∼47–65 dB (2–3.8 GHz) and ∼65–45 dB (3.8–8 GHz), following absorption as the dominant mechanism due to the matching of dielectric loss and magnetic loss. It is anticipated that such excellent performance of robust FG/Ni/PANI ternary composites at a very low thickness (0.5 mm) has great potential in the application of microwave-absorbing materials.

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A promising broadband and thin microwave absorber based on ternary FeNi@C@polyaniline nanocomposites

Abstract: Ternary FeNi@C@polyaniline (PANI) nanocomposites are synthesized by combining the arc-discharge process and an in situ chemical oxidative polymerization reaction, and can be seen as a good candidate for microwave absorbents with a broad bandwidth.

Cited by 20 publications

References 47 publications

Recent Advances in Conjugated Polymer-Based Microwave Absorbing Materials

Recent Advances in Conjugated Polymer-Based Microwave Absorbing Materials

Structural and Carbonized Design of 1D FeNi/C Nanofibers with Conductive Network to Optimize Electromagnetic Parameters and Absorption Abilities

Functionalized Graphene/Nickel/Polyaniline Ternary Nanocomposites: Fabrication and Application as Electromagnetic Wave Absorbers

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