Enhanced microwave absorption of biomass carbon/nickel/polypyrrole (C/Ni/PPy) ternary composites through the synergistic effects

Wang, Qiuyue; Wu, Xiaofen; Huang, Ji; Chen, Siyi; Zhang, Yang; Dong, Chengjun; Chen, Gang; Wang, Lihong; Guan, Hongtao

doi:10.1016/j.jallcom.2021.161887

Cited by 55 publications

(21 citation statements)

References 65 publications

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“…In particular, the two bands for PDA/Ppy/ND shifted to 1366 and 1557 cm −1 , confirming the hybridizations on Ppy [ 40 ]. Additionally, the Ppy-typical bands due to C-H out-of-plane deformation (932 cm −1 ) [ 41 ] both disappeared in the Raman spectra of PDA/Ppy and PDA/Ppy/ND, which is likely due to π-π stacking interactions, further limiting C-H deformations. Given the FTIR results, these phenomena further revealed π-π stacking and asymmetric polar hybridizations on the C-N groups in PDA/Ppy/ND.…”

Section: Resultsmentioning

confidence: 99%

Design of Flexible Film-Forming Polydopamine/Polypyrrole/Nanodiamond Hierarchical Structure for Broadband Microwave Absorption

et al. 2022

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Microwave-absorbing materials are widely used in numerous fields, including the military, daily protection, etc. Currently, in addition to being lightweight and highly efficient, good film-forming processing characteristics and environmental stability are also required for the practical application of microwave-absorbing materials, which, in general, are difficult to make compatible. In this paper, a mulberry-like PDA/PPy/ND hierarchical structure was prepared by in situ polymerization. The hierarchical structure showed remarkably enhanced microwave absorption, as well as better flexible film-forming characteristics, thanks to the multiple roles PDA played in the system. The optimal RL peak for PDA/PPy/ND could reach −43.6 dB at 7.58 GHz, which is mainly attributed to the multiple dielectric loss paths and significantly improved impedance-matching characteristics. Furthermore, given the H-bond crosslink, the introduction of PDA also promoted the film formation and dispersion of PDA/PPy/ND in the PVA matrix, forming a water-resistant and flexible film. This work provides a referencing path for the design and practical applications of lightweight microwave-absorbing materials.

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Section: Resultsmentioning

confidence: 99%

Design of Flexible Film-Forming Polydopamine/Polypyrrole/Nanodiamond Hierarchical Structure for Broadband Microwave Absorption

et al. 2022

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“…However, according to the free electron theory, conductive PPy has high permittivity, leading to mismatching between the dielectric constant and permeability, to be more precise, a mismatching in impedance, thus affecting its microwave absorption performance [ 10 ]. Therefore, many composites composed of PPy and magnetic metal compounds have been investigated, including Fe 3 O 4 [ 11 ], Co 3 O 4 [ 12 ], MoS 2 [ 13 ], ZnFe 2 O 4 [ 14 ], Ni [ 15 ], and other designed PPy magnetic metal composites. In these works, the inclusion of magnetic loss makes a significant improvement in electromagnetic absorption performance.…”

Section: Introductionmentioning

confidence: 99%

Polypyrrole/Schiff Base Composite as Electromagnetic Absorbing Material with High and Tunable Absorption Performance

Huang

et al. 2022

Molecules

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In recent years, Schiff base-related conjugated systems have received extensive attention, but little research has been done in the field of electromagnetic materials. In this work, an organic conjugated system based on polypyrrole/hydrazone Schiff base (PPy/HSB) composites was constructed via a Schiff base synthetic route and their electromagnetic behavior was investigated. The electromagnetic response of PPy/HSB complexes demonstrates fine electromagnetic absorption performance. When the filler loading is 30 wt% in a paraffin matrix, an absorption peak of −43.1 dB was achieved and its effective absorption bandwidth (EAB) was located in the range of 10.88−18.0 GHz. The electromagnetic response behavior of PPy/HSB complexes is explained by models involving electronic structure, multi-polarization and conductive network. The mechanisms of PPy/HSB complexes formation and HSB crystallization are also discussed through the compatibility of PPy/HSB and the structure of HSB. Moreover, the morphology transformation of HSB in the PPy/HSB systems has been studied. This study opens the exploration of organic–dielectric conjugated systems in the field of electromagnetic materials, and significantly broadens the application range of organic–dielectric–dielectric composites.

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“…Among all the MAMs, conductive polymers have attracted extensive interest because of their light specific gravity, good electrical conductivity and facile fabrication conditions [ 6 , 7 , 8 , 9 ]. More importantly, by tuning the polymerization process, the conductivity of conducting polymers can be modulated from insulator to conductor [ 10 ], which greatly favors the tuning of dielectric loss and impedance to improve its microwave-absorption performance [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…Another effective way is to couple PPy with other dielectric-loss or magnetic materials. Thus, excellent EMW absorption can be achieved due to impedance matching and the synergistic effects on the dissipation of electromagnetic energy [ 7 , 18 , 19 ]. For instance, PPy coupled with biomass carbon and Ni particles gives an RL min of −42 dB with an EAB of 5.24 GHz due to the improved impedance matching and synergistic effects of dielectric and magnetic loss [ 7 ].…”

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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Enhanced microwave absorption of biomass carbon/nickel/polypyrrole (C/Ni/PPy) ternary composites through the synergistic effects

Cited by 55 publications

References 65 publications

Design of Flexible Film-Forming Polydopamine/Polypyrrole/Nanodiamond Hierarchical Structure for Broadband Microwave Absorption

Design of Flexible Film-Forming Polydopamine/Polypyrrole/Nanodiamond Hierarchical Structure for Broadband Microwave Absorption

Polypyrrole/Schiff Base Composite as Electromagnetic Absorbing Material with High and Tunable Absorption Performance

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

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