Synergistic Enhancement of Microwave Absorption Using Hybridized Polyaniline@helical CNTs with Dual Chirality

Tian, Xin; Meng, Fanbin; Meng, Fanwei; Chen, Xiangnan; Guo, Yifan; Wang, Ying; Zhu, Wenjun; Zhou, Zuowan

doi:10.1021/acsami.7b02607

Cited by 183 publications

(63 citation statements)

References 42 publications

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“…To alleviate this harm, various EM absorbing materials have been developed. Amongst them, magnetic ferrites [1] were the first to be used, followed by linear carbon-based materials such as carbon fibers [2], carbon nanotubes [3], and conductive polymers [4,5,6]. However, absorbers developed using these traditional materials have a narrow absorbing bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of GNPs@NixSy@MoS2 Composites with Hierarchical Structures for Microwave Absorption

Wang

Zhang

et al. 2019

Nanomaterials

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Graphene-based powder absorbers have been used to attain excellent microwave absorption. However, it is not clear if inferior microwave absorption by pure graphene materials can be attributed to impedance mismatching or inadequate attenuation capability. In this comparative study, we focus on these aspects. Graphene nanoplatelets (GNPs) multi-component composites (GNPs@NixSy@MoS2) were prepared by hydrothermal reaction with different S and Mo molar ratios. The morphologies, phase crystals, elemental composition, and magnetic properties of the composites were also analyzed. In addition, microwave absorption of the as-prepared samples was investigated and it revealed that the impedance mismatching could be responsible for inferior microwave absorption; higher conductivity can lead to skin effect that inhibits the further incidence of microwaves into the absorbers. Furthermore, the optimum reflection loss (RL) of GNPs@NixSy@MoS2-2 can reach −43.3 dB at a thickness of 2.2 mm and the corresponding bandwidth with effective attenuation (RL < −10 dB) of up to 3.6 GHz (from 7.0 to 10.6 GHz). Compared with the GNPs, the enhanced microwave absorption can be assigned to the synergistic effects of conductive and dielectric losses.

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Section: Introductionmentioning

confidence: 99%

Facile Synthesis of GNPs@NixSy@MoS2 Composites with Hierarchical Structures for Microwave Absorption

Wang

Zhang

et al. 2019

Nanomaterials

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“…where Z in represents the input impedance at the surface of the absorber, Z 0 is the impedance of free space, d is thickness of the sample, f is the frequency of the electromagnetic wave, and c is the speed of light. When the RL values are −10 and −20 dB, it means that 90% and 99% of the incident EM waves are attenuated [35,36]. Also, the frequency ranges of RL values below −10 dB are valuable for engineering applications [10].…”

Section: Resultsmentioning

confidence: 99%

Ultrafine FeNi3 Nanocrystals Embedded in 3D Honeycomb-Like Carbon Matrix for High-Performance Microwave Absorption

Han

Zhang

et al. 2020

Nanomaterials

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The reasonable design of magnetic carbon-based composites is of great significance to improving the microwave absorption (MA) performance of the absorber. In this work, ultrafine FeNi3 nanocrystals (5–7 nm) embedded in a 3D honeycomb-like carbon matrix (FeNi3@C) were synthesized via a facile strategy that included a drying and carbonization process. Because of the soft magnetic property of the FeNi3 nanocrystals and their unique 3D honeycomb-like structure, the FeNi3@C composites exhibit excellent MA abilities. When the filler loading ratio of FeNi3@C/paraffin composites is only 30 wt%, the maximum reflection loss (RL) value is −40.6 dB at 10.04 GHz. Meanwhile, an ultra-wide absorption frequency bandwidth of 13.0 GHz (5.0–18.0 GHz over −10 dB) can be obtained in the thickness range of 2.0–4.5 mm, and this means that the absorber can consume 90% of the incident waves. It benefits from the dual loss components, multiple polarizations, and multiple reflections for improving MA performances of FeNi3@C composites. These observations suggest that the 3D honeycomb-like FeNi3@C composites have broad application prospects in exploring new MA materials that have a wide frequency bandwidth and strong absorption.

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“…PANI-CSA@HCNTs with a thickness of 3.7 mm showed the optimal absorption of À32.5 dB at 8.9 GHz but that of PANI-HCl@HCNTs was only À13.6 dB. 29 Highly conducting CNT/PANIbenzenesulfonic acid hybrids exhibited maximum RL value of À41.37 dB at 13.28 GHz with a thickness of 2.0 mm when the radio frequency power reached 50 W. 30 It is suggested that the various dopants, microstructures, and polymerization methods have influence on the electromagnetic properties.…”

Section: Characterizationmentioning

confidence: 90%

Itaconic acid–doped polyaniline/MWCNTs nanocomposites for microwave absorbing materials

Wang

Liu

Han

et al. 2018

High Performance Polymers

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Itaconic acid–doped polyaniline (PANI)/multiwalled carbon nanotubes (MWCNTs) nanocomposites were prepared via in situ polymerization for microwave absorbing materials. The interaction between PANI and MWCNTs and the influence of MWCNTs loadings on the properties of their nanocomposites were investigated by various measurements, such as Fourier transform infrared spectroscopy, X-ray diffraction, field-emission scanning electron microscopy, thermogravimetric analysis, and network analyzer. The electron delocalization in the composites is associated with the π–π* interaction between the surface of MWCNTs and the quinoid rings of PANI. The conductivity, crystallinity, and thermal stability of the nanocomposites with different morphologies have been increased due to the introduction of different MWCNTs loadings. Moreover, the microwave-absorbing property of itaconic acid-doped PANI in the reflection loss value and in different frequency areas is improved by the incorporation of MWCNTs. The nanocomposites are promising candidates in microwave absorption applications.

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Synergistic Enhancement of Microwave Absorption Using Hybridized Polyaniline@helical CNTs with Dual Chirality

Cited by 183 publications

References 42 publications

Facile Synthesis of GNPs@NixSy@MoS2 Composites with Hierarchical Structures for Microwave Absorption

Facile Synthesis of GNPs@NixSy@MoS2 Composites with Hierarchical Structures for Microwave Absorption

Ultrafine FeNi3 Nanocrystals Embedded in 3D Honeycomb-Like Carbon Matrix for High-Performance Microwave Absorption

Itaconic acid–doped polyaniline/MWCNTs nanocomposites for microwave absorbing materials

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