Interfacial synthesis of polypyrrole microparticles for effective dissipation of electromagnetic waves

Xie, Aming; Jiang, Wanchun; Wu, Fan; Dai, Xiaoqing; Sun, Mengxiao; Wang, Yuan; Wang, Mingyang

doi:10.1063/1.4936549

Cited by 38 publications

(21 citation statements)

References 28 publications

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“…[1][2][3] Over the past few decades, microwave absorption materials with the advantage of flexible, lightweight, thermally, thin in thickness, and strong in absorption over a broad absorption frequency range are highly enjoyed for aircraft and electronics. [4][5][6] Therefore, numerous studies have focused on developing the absorbents with special microstructures including porous structure, core-shelled structure and heterostructure, which can greatly enhance electromagnetic wave absorption properties due to interfacial polarization, multiple reflection, and synergistic effects. 1,2,[7][8][9] Of all the critical electromagnetic wave absorption materials, polymer-derived ceramics (PDC), including SiOC, SiBCN, SiCN, and Si 3 N 4 , have captured growing attention due to their controllable microstructure, lightweight, excellent thermomechanical properties, and a wide absorption frequency.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic wave absorbing properties of glucose‐derived carbon‐rich SiOC ceramics annealed at different temperatures

Qian

et al. 2019

J Am Ceram Soc

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A kind of glucose‐derived carbon‐rich silicon oxycarbide (glucose‐SiOC) nanocomposite with excellent electromagnetic wave absorbing performance is obtained via solvothermal method, and then pyrolyzed at high temperature (1300°C and 1400°C) under argon atmosphere. The structural evolutions and the electromagnetic wave absorbing capabilities of the nanocomposites have been systematically investigated. The resultant 3 mol/L glucose‐SiOC ceramic exhibits a heterostructure, in which nanosized glucose‐derived carbon and SiC particles decorate on amorphous SiOC network. Benefitting from the nanosized carbon, SiC particles and the heterostructure attributes, the 3 mol/L glucose‐SiOC ceramic displays a strong electromagnetic wave‐absorbing property. The minimum reflection coefficient of the 3 mol/L glucose‐SiOC ceramic pyrolyzed at 1400°C reaches −27.6 dB at 13.8 GHz. The widest effective absorption bandwidth attains 3.5 GHz in Kμ‐band. This work opens up a novel and simple route to fabricate polymer‐derived ceramics with excellent electromagnetic wave‐absorbing performance.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic wave absorbing properties of glucose‐derived carbon‐rich SiOC ceramics annealed at different temperatures

Qian

et al. 2019

J Am Ceram Soc

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“…Based on Equation , it can be found that the plot of ε′ versus ε″ should be a semicircle. This semicircle is described as the Cole–Cole semicircle . Each Cole–Cole semicircle represents one Debye relaxation .…”

Section: Resultsmentioning

confidence: 99%

An Ingenious Strategy to Construct Helical Structure with Excellent Electromagnetic Shielding Performance

Zhang

Yang

Wen

2019

Adv Materials Inter

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necessary features has captured enormous scientific attentions.In particular, intrinsically conductive polymers (ICPs) have gained a special status among the promising EMI shielding materials. Among the large family of ICPs, polyaniline (PANI) is one of the prominent polymers, primarily owing to its fascinating properties, such as high electrical conductivity, ease of fabrication, unique controlled chemical and physical properties, as well as low cost. [3] Recently, PANI-based composite has aroused great interest due to the magnified or enhanced electromagnetic properties compared to their bulk counterpart. [4] Various components, such as carbon material, barium titanate (BaTiO 3 ), and bagasse fiber have been adopted to prepare the composites. For example, multi-walled carbon nanotube (MWCNT)/PANI nanocomposites possess a total EMI shielding effectiveness (SE) of ≈39.2 dB at the thickness of 2.0 mm, which is attributed to the synergistic effect of two complementary MWCNT and PANI phases. [5] Due to the optimized dielectric and electrical properties, an excellent SE of 71.5 dB was achieved for BaTiO 3 /PANI nanocomposites with the thickness of 2.7 mm. [6] Compared to pristine PANI, the core-shelled bagasse fiber@PANI composite exhibits immense potential for EMI shield with higher attenuation performance due to the synergistic and interfacial effects. [4b] It is noteworthy that in above cases the structure of PANI is a key parameter that determines its properties and application. Therefore, the delicate regulation and control of highly ordered PANI structures are highly desirable.On the other hand, inspired by natural materials, the designed helical structures endow materials the unique electrical and magnetic performance. Motojima et al. reported the microwave can be significantly attenuated by the helical structure, because of the effective generation of an inductive current. [7] Most recently, Yang et al. reported that PANI with a helical superstructure was produced by co-self-assembly process combined with emulsion droplets methods. The enhanced microwave absorption ability was achieved due to the supramolecular chirality. [8] So, the helical structure is expected to produce excellent EMI shielding performances. But as of yet, sparse research has concentrated on the effect of spiral structure on the shielding properties of PANI-based composites and their underlying mechanism. Furthermore, the EMI shielding capability of the PANI-based helical composite lacks sufficient theoretical Herein, a unique, 3D helical composite with excellent electromagnetic interference (EMI) shielding capability is fabricated. The alkali treated natural cotton fiber (NaCF) is adopted as the helical templet. The compacted polyaniline (PANI) clusters are grafted over NaCF surface via in situ polymerization technology. The correlation between structure and electromagnetic characteristics is investigated in details. The high doping degree and high crystalline phase of PANI coating layer results in the enhanced electrical conductivit...

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“…It has been well-documented that the electrical conductive network can be well established in the PPy based hybrids. 3,15 As is shown in the of σ for the three samples was calculated by fitting the Eq. (2), which decreases with increasing mass ratio of α-Fe 2 O 3 .…”

Section: Resultsmentioning

confidence: 99%

“…3 Several materials with specific structure have been used for EA, such as metallic or alloy nanoparticles including dendrite-like Fe x O y , 4 Fe x O y @SiO 2 core-shell nanostructure, 5 and ZnO nanorods, 6 carbon materials including graphite nanosheets, 7 carbon nanotubes (CNTs), 8,9 carbon nanocoils, 10 and reduced grapheme oxides (RGO), 11 conducting polymers (CPs) including polythiophene (PTh), 12 polyaniline (PANi), 13 and polypyrrole (PPy). 14,15 Lightweight is one of the key factors that can significantly influence the practical applications of EA materials because it can reduce the weight and strengthen the manipulation of electric equipment. Recent reports have suggested that forming three-dimensional (3D) reticulated microstructure during synthesis is an efficient way to reduce weight.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional (3D) α-Fe2O3/polypyrrole (PPy) nanocomposite for effective electromagnetic absorption

et al. 2016

Self Cite

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The lightweight and 3-dimensional reticulated α-Fe2O3/PPy hybrids were successfully fabricated via a facile one-pot polyreaction. The measured complex permittivity and microwave attenuation performance suggest that the dielectric properties of PPy can be regulated by the mass ratio of added α-Fe2O3. The two dielectric resonance peaks of complex permittivity can be ascribed to the interface capacitor-like structure. An equivalent circuit model was established to explain the nonlinear resonance behavior of the α-Fe2O3/PPy wax composites. The addition of α-Fe2O3 properly tuned the dielectric constant to endow the composites with highly efficient microwave absorption. The minimum reflection loss of α-Fe2O3/PPy wax composites were enhanced to nearly −29dB with an effective bandwidth (RL≤ − 10dB) up to 5.0GHz. The numerical method was proposed to calculate the optimum thickness for minimum RL at expected frequency by detailed investigation on the transmission formula. Moreover, the required thickness for optimum absorption efficiency at expected frequency can be obtained directly.

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Interfacial synthesis of polypyrrole microparticles for effective dissipation of electromagnetic waves

Cited by 38 publications

References 28 publications

Electromagnetic wave absorbing properties of glucose‐derived carbon‐rich SiOC ceramics annealed at different temperatures

Electromagnetic wave absorbing properties of glucose‐derived carbon‐rich SiOC ceramics annealed at different temperatures

An Ingenious Strategy to Construct Helical Structure with Excellent Electromagnetic Shielding Performance

Three-dimensional (3D) α-Fe2O3/polypyrrole (PPy) nanocomposite for effective electromagnetic absorption

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