Maximizing the microwave absorption performance of polypyrrole by data-driven discovery

Green, Michael; Tran, Anh Thi Van; Chen, Xiaobo

doi:10.1016/j.compscitech.2020.108332

Cited by 51 publications

(49 citation statements)

References 40 publications

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“…Thus, the SiO2@Fe3C/Fe@NCNT-GT showed a significantly enhanced EMW absorption property in the main parameters, including RL, min, EAB10 and d values, showing it has potential applications in practical EMW absorption. In addition, our prepared SiO2@Fe3C/Fe@NCNT-GT had comparable, or better, EMW absorption performance than reported carbon nanotube-based absorbent materials (Figure 5c, Table S2) [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53]. The Mz-f plot reveals that the SiO2@Fe3C/Fe@NCNT-GT had better impedance matching characteristics compared to the SiO2@Fe3C/Fe@NCNT (Figure S9).…”

Section: Resultsmentioning

confidence: 72%

Tuning Dielectric Loss of SiO2@CNTs for Electromagnetic Wave Absorption

et al. 2021

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We developed a simple method to fabricate SiO2-sphere-supported N-doped CNTs (NCNTs) for electromagnetic wave (EMW) absorption. EMW absorption was tuned by adsorption of the organic agent on the precursor of the catalysts. The experimental results show that the conductivity loss and polarization loss of the sample are improved. Meanwhile, the impedance matching characteristics can also be adjusted. When the matching thickness was only 1.5 mm, the optimal 3D structure shows excellent EMW absorption performance, which is better than most magnetic carbon matrix composites. Our current approach opens up an effective way to develop low-cost, high-performance EMW absorbers.

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Section: Resultsmentioning

confidence: 72%

Tuning Dielectric Loss of SiO2@CNTs for Electromagnetic Wave Absorption

et al. 2021

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“…The PPy-MO and PPy-MB samples shielded about 80% of the incoming electromagnetic signal (by a combination of reflection and absorption) at the concentration of 5% w/w . This is quite a promising result, as a commonly used loading of globular PPy is around tens of % w/w in order to obtain similar results [ 16 ].…”

Section: Resultsmentioning

confidence: 99%

“…PPy for EMI shielding is commonly employed in globular morphology as a composite with metallic nanoparticles or carbonaceous materials [ 13 , 14 ]. However, PPy can be also used as a plain powder [ 15 , 16 ] or structure-forming material, e.g., epoxide composites [ 2 ], film-forming material on the surface of various objects, e.g., sawdust [ 17 , 18 ], silver sponges [ 19 ], zeolites [ 20 ], fabrics [ 21 , 22 , 23 , 24 , 25 ], wool [ 26 ] and membranes [ 27 ]. The disadvantage of applying the globular morphology in EMI shielding is the necessity of using high loadings (~tens of % w/w ) in order to reach the percolation threshold [ 16 ], which may result in deterioration of the mechanical properties of the used matrix.…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Nanostructures of Polypyrrole for Shielding of Electromagnetic Interference in the Microwave Region

Moučka

Sedlačík

Kasparyan

et al. 2020

IJMS

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Polypyrrole one-dimensional nanostructures (nanotubes, nanobelts and nanofibers) were prepared using three various dyes (Methyl Orange, Methylene Blue and Eriochrome Black T). Their high electrical conductivity (from 17.1 to 60.9 S cm−1), good thermal stability (in the range from 25 to 150 °C) and resistivity against ageing (half-time of electrical conductivity around 80 days and better) were used in preparation of lightweight and flexible composites with silicone for electromagnetic interference shielding in the C-band region (5.85–8.2 GHz). The nanostructures’ morphology and chemical structure were characterized by scanning electron microscopy, Brunauer–Emmett–Teller specific surface measurement and attenuated total reflection Fourier-transform infrared spectroscopy. DC electrical conductivity was measured using the Van der Pauw method. Complex permittivity and AC electrical conductivity of respective silicone composites were calculated from the measured scattering parameters. The relationships between structure, electrical properties and shielding efficiency were studied. It was found that 2 mm-thick silicone composites of polypyrrole nanotubes and nanobelts shield almost 80% of incident radiation in the C-band at very low loading of conductive filler in the silicone (5% w/w). Resulting lightweight and flexible polypyrrole composites exhibit promising properties for shielding of electromagnetic interference in sensitive biological and electronic systems.

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“…The RL was studied to evaluate the EMWAPs of the PPy nanostructures at various [HCl], as shown in Figure 9 and Table 1 [47][48][49][50][51][52][53][54][55][56]. The PPy planar helix formed at [HCl]=0 M exhibits a wide absorption band over the frequency ranges of 3-18 GHz (Figure 9(a2)), corresponding to the λ/4 damping model.…”

Section: Em Propertiesmentioning

confidence: 99%

HCl guided morphology and conductivity of chiral PPy nanostructures toward efficient electromagnetic wave absorption

Yang

Fan

Wang

et al. 2021

Sci. China Technol. Sci.

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To solve the severe electromagnetic (EM) radiation from the widespread application of electronic equipment, we developed a simple template-guided oxypolymerization strategy to synthesize polypyrrole (PPy) planar helixes as an efficient EM wave (EMW) absorber, and systematically investigated the morphology-dependent chirality, conductivity, and microwave absorption properties. As HCl concentration [HCl] varied from 0 to 2.0 M, the morphology evolved from planar helix to 3D cross-linking network structures, the conductivity increased from 0.0019 to 0.0302 S/cm, and the EM parameters peaked at [HCl]=0.5 M. Compared to other absorbers, the PPy planar helix formed at [HCl]=0 M possessed wider absorption band (5.84 GHz), smaller matching thickness (1.6 mm), lower loading (25 wt.%), and intenser absorption (−48.17 dB). The reason lies in the strong attenuation capability, multiple resonances, multiple scattering, and good impedance matching generated by chiral PPy planar helixes with a distinctive helical configuration, doped heteroatoms (O,S), and a local conductive network. Our results suggest that PPy planar helixes offer great promise for fields such as chiral sensors, electronics, optics, chiral catalysis, and EMW absorption and shielding due to their distinctive morphology, tunable conductivity, and outstanding EMW absorption properties (EMWAPs).

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Maximizing the microwave absorption performance of polypyrrole by data-driven discovery

Cited by 51 publications

References 40 publications

Tuning Dielectric Loss of SiO2@CNTs for Electromagnetic Wave Absorption

Tuning Dielectric Loss of SiO2@CNTs for Electromagnetic Wave Absorption

One-Dimensional Nanostructures of Polypyrrole for Shielding of Electromagnetic Interference in the Microwave Region

HCl guided morphology and conductivity of chiral PPy nanostructures toward efficient electromagnetic wave absorption

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