Two birds with one stone: Superhelical chiral polypyrrole towards high-performance electromagnetic wave absorption and corrosion protection

Ren, Hai‐Peng; Li, Tian; Wang, Huagao; Guo, Zihao; Chen, Tanlin; Meng, Fanbin

doi:10.1016/j.cej.2021.131582

Cited by 90 publications

(36 citation statements)

References 82 publications

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“…The morphologies of GO/CPPy 10 , GO/CPPy 20 , and GO/ CPPy 30 were observed by SEM, as shown in Figure 1. For reference, we analyzed the helical polypyrrole (HPPy) nanofibers in our previous research, 39 which were uniformly fibrous and featured a good helical structure. Moreover, the microstructures of the GO/CPPy hybrids are displayed in Figure 1a−c.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, pure EP and 0.6% PPy-EP were prepared as reported in our previous literature. 39 2.4. Preparation of GO/CPPy/epoxy Resin Microwave Absorbing Coatings.…”

Section: Preparation Of Go/cppy/epoxy Resin Anticorrosionmentioning

confidence: 99%

“…In addition to the magnetic loss based on the chiral helical structure, 39 the GO/CPPy introduced more interfaces to increase the dielectric loss, 51 thereby improving impedance matching and electromagnetic wave attenuation capabilities. Meanwhile, GO further enhanced the physical barrier effect of the composite coatings.…”

Section: Introductionmentioning

confidence: 99%

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Coatings Comprised of Graphene Oxide Decorated with Helical Polypyrrole Nanofibers for Microwave Absorption and Corrosion Protection

Chen

Wang²,

Zheng³

et al. 2022

ACS Appl. Nano Mater.

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In recent years, microwave absorbing (MA) materials have developed rapidly and made good progress. However, MA materials with thin thickness and light weight are still a huge challenge. Furthermore, the application of single-function MA materials is severely restricted due to poor environmental adaptability in actual use, especially in harsh marine environments. Herein, we prepared graphene oxide/chiral polypyrrole hybrid (GO/CPPy) materials, which showed microwave absorbing properties combined with anticorrosion performance, by in situ polymerization. The sheet-layer GO/CPPy was composed of chiral helical polypyrrole and two-dimensional GO sheets. The introduction of chiral polypyrrole not only brought good dielectric loss but also produced additional magnetic loss. As a result, the GO/CPPy hybrids indicated a strong reflection loss (RL) of −55.5 dB at 8.55 GHz with a thickness of 3.8 mm. Meanwhile, they exhibited a broad effective bandwidth of 8.4 GHz from 9.1 to 17.5 GHz. In addition, 0.6% GO/CPPy-EP composite coatings displayed excellent long-term corrosion resistance with a remarkable corrosion protection capability (99.73%) after 21 days of immersion in a corrosive medium. Furthermore, the corresponding 6% GO/CPPy-EP microwave absorbing coatings retained high MA performance with a minimum RL of −27.5 dB at 12.38 GHz, which was tested using a bow reflectivity test system after immersion in 3.5% NaCl solution for 21 days. Moreover, the MA performance dropped only by 13.79%. This work could open new avenues toward the development of MA materials with corrosion protection performance.

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Section: Resultsmentioning

confidence: 99%

“…In addition, pure EP and 0.6% PPy-EP were prepared as reported in our previous literature. 39 2.4. Preparation of GO/CPPy/epoxy Resin Microwave Absorbing Coatings.…”

Section: Preparation Of Go/cppy/epoxy Resin Anticorrosionmentioning

confidence: 99%

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Coatings Comprised of Graphene Oxide Decorated with Helical Polypyrrole Nanofibers for Microwave Absorption and Corrosion Protection

Chen

Wang²,

Zheng³

et al. 2022

ACS Appl. Nano Mater.

Self Cite

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“…In this context, chiral microstructure is expected to provide a new path to solve above-mentioned bottlenecks of MAMs. [35] Chiral structure has special symmetry that its mirror image cannot be superimposed with it via any symmetrical operations, [36] which give rise to particular electromagnetic coupling: [27] the chiral electric dipole can not only derive electric polarization, but also magnetic polarization, and vice versa (Note S1, Supporting Information), which thus expected to improve impedance match and absorption bandwidth. Carbon fiber, [37] carbon nanotube, [38] polypyrrole, [39] and polyaniline [40] etc.…”

Section: Introductionmentioning

confidence: 99%

Chiral Asymmetric Polarizations Generated by Bioinspired Helical Carbon Fibers to Induce Broadband Microwave Absorption and Multispectral Photonic Manipulation

Huang

Duan

Shi

et al. 2022

Advanced Optical Materials

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as stealth systems, [1] electromagnetic pollu tion eradicators, [2] and various electronic and communicational devices, [3] etc. [4] Broadband absorption is key factor of MAMs, which derived from two types of materials: [5] dielectric loss materials (graphene, [6] carbon nanotubes, [7] biomass carbon materials, [8] conductive polymer, [9] ZnO, [10] MnO 2 , [11] etc.) and magnetic loss materials (ferrite, [12] carbonyl iron, [13] high entropy alloys, [14] and other ferromagnetic alloys [15] ). Previous studies have demonstrated that MAMs with both dielectric loss (permittivity) and magnetic loss (permeability) were more easily to achieve good impedance match and thus broadband absorption. [16] Common method for fabricating mentioned electromagnetic complexes was mixing dielectric and magnetic matters, the carbonyl iron/carbon nanotubes composite absorbers could exhibit double resonance of the complex permittivity and permeability, thus reach effective absorption (reflection loss (RL) ≤ −10 dB) within 9.7-18 GHz regime under 1.4 mm thickness. [17] However, such addition of ferromagnetic materials brings some disadvantages such as high density and easy oxidation. The mentioned drawback could be avoid by some complicated synthetic method such as doping ferromagnetic ions in dielectric materials, [3] or preparing metal-organic frameworks (MOFs). [18] In addition to the intrinsic parameters of materials, metastructures [19] and microstructures [20] could give MAMs new design freedoms to broad absorption bandwidth. Metastructures can give MAMs additional effect to form metamaterials, [21] which could improve the absorption bandwidth by constructing equivalent circuit models, [22] vortex current loss, [23] overlapped reflections, [24] and polarization rotation, [25] etc., a metamaterial with square unit cells made of carbon black can achieve absorption bandwidth that 2.35-18 GHz (absorptivity more than 96.8%) under thickness of 17 mm, [26] our previous works brought optical rotation of chiral metamaterials based on high entropy alloys to consume microwaves, the effective absorption bandwidth (RL ≤ −10 dB) covered 4-5.54, 6.66-8.12, and 8.84-18 GHz under 20 mm thickness. [27] Whereas the thickness of metamaterials has to close to wavelength, because the loss effects of metamaterials are generated by subwavelength resonance that based on wave theory, thus difficult to broadband Chirality, in which electromagnetic characteristic promotes asymmetric polarization, is expected to realize broadband absorption for microwave absorption materials (MAMs). Herein, inspired by the microstructure of nepenthes, a scalable approach is reported for fabricating hierarchical-chiral helical carbon fibers with broadband microwave absorption as well as multispectral chiral manipulation. The chiral potential barriers are established by applying helically distributed stress to the fiber, which induce helical electric dipoles via positive and negative charges accumulated at the potential barriers. The states of polarization loss by Debye relaxat...

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“…The design of PPy in homogeneous morphology and microstructure is especially highly focused. Ren et al [ 17 ] demonstrated that superhelical chiral PPy nanofibers exhibited excellent microwave-absorption performance, in which the minimum RL ( RL min ) could reach −44.5 dB with a loading of only 6 wt%. Another effective way is to couple PPy with other dielectric-loss or magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

Polystyrene-Modulated Polypyrrole to Achieve Controllable Electromagnetic-Wave Absorption with Enhanced Environmental Stability

Huang

et al. 2022

Nanomaterials

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The moderation of the dielectric properties of polymer composites and their environmental stability need to be considered comprehensively in the design of microwave-absorbing materials. In this work, polypyrrole/polystyrene (PPy/PS) composited particles were synthesized through a facile in situ bulk polymerization procedure. The PS component can be modulated conveniently by controlling the polymerization time. FTIR and Raman analyses disclosed that the PS component was immobilized in PPy via covalent bonds. The electromagnetic characterization results indicated that the dielectric properties and, thus, the microwave absorption could be controlled when the styrene polymerization was prolonged from 6 h (PPy-6) to 19 h (PPy-19). The composite PPy-19 displayed an optimal reflection loss of −51.7 dB with a matching thickness of 3.16 mm, and the effective absorption bandwidth (EAB) even reached 5.8 GHz at 2.4 mm. The PS component endowed PPy/PS composites with more robust environmental stability than homogeneous PPy. After being exposed to air for 365 days and hydrothermally treated at 100 °C for 12 h, PPy-19 still exhibited a reflection loss superior to −20 dB. The present work provides a new insight into the adjustment of the electromagnetic properties of PPy composites to fabricate high-performance microwave absorbers with superior environmental stability.

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Two birds with one stone: Superhelical chiral polypyrrole towards high-performance electromagnetic wave absorption and corrosion protection

Cited by 90 publications

References 82 publications

Coatings Comprised of Graphene Oxide Decorated with Helical Polypyrrole Nanofibers for Microwave Absorption and Corrosion Protection

Coatings Comprised of Graphene Oxide Decorated with Helical Polypyrrole Nanofibers for Microwave Absorption and Corrosion Protection

Chiral Asymmetric Polarizations Generated by Bioinspired Helical Carbon Fibers to Induce Broadband Microwave Absorption and Multispectral Photonic Manipulation

Polystyrene-Modulated Polypyrrole to Achieve Controllable Electromagnetic-Wave Absorption with Enhanced Environmental Stability

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