Facile synthesis of nitrogen-doped porous Ni@C nanocomposites with excellent synergistically enhanced microwave absorption and thermal conductive performances

Ma, Lingling; Dou, Zhifeng; Li, Daguang; Li, Jun; Xu, Yang; Wang, Guizhen

doi:10.1016/j.carbon.2022.09.055

Cited by 38 publications

(14 citation statements)

References 71 publications

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“…Nowadays, with rapid development of advanced detection and communication technology, many challenges have been proposed for microwave absorption materials, especially in aspects of broadening effective bandwidth and reducing weight and thickness of absorbers. [ 1–4 ] Some strategies have been put forward to achieve this target, such as designing distinctive structures and regulating the loss medium composition, [ 5–9 ] adding extra dielectric/magnetic particles into matrix, [ 10–13 ] exploring novel porous, core–shell, hierarchical, or topological tuning structures. [ 14–17 ] Among these strategies, chiral materials with helical structure emerge outstanding electromagnetic wave loss capability owing to special electromagnetic cross polarization and further impedance optimization.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Response of Multistage‐Helical Nano‐Micro Conducting Polymer Structures and their Enhanced Attenuation Mechanism of Multiscale‐Chiral Synergistic Effect

et al. 2023

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Among these strategies, chiral materials with helical structure emerge outstanding electromagnetic wave loss capability owing to special electromagnetic cross polarization and further impedance optimization. [18][19][20] Moreover, chiral MAMs can induce magnetic loss to certain extent without adding extra magnetic lossy medium, contributing to lightweight design and environmental preparation. [21,22] Recently, helical nanocarbon nanotubes/fibers, chiral conductive polymers, and the corresponding composites have all been proven to possess good microwave absorption. The corresponding loss mechanism mainly comes from the additional magnetic loss caused by cross polarization, interface polarization loss, conductance loss, and so on.However, in spite chiral MAMs begin to attract more and more attention recently, many studies just focus on simple material preparation and performance characterization. There are still some problems remaining to solve for chiral MAMs, especially in performance modulation and chiral absorption mechanism. Most available construction strategy could hardly precisely control the ordering of chiral/ helical morphology and even helical parameters. Furthermore, the restriction and cooperation relationship between chiral/ helical structure and electromagnetic characteristics is still fuzzy and it lacks guidelines and explanations for how helical parameters influence MA properties. As a result, it is laborious to make it clear how helical structure would affect properties by experimental design, even not to mention the high-performance MA. Therefore, more challenges are deserved to overcome in order to promote the developments chiral MAMs.To handle the above-mentioned problems, a designable strategy was herein proposed to construct multistage-superhelical nano-microstructures with superhelical polypyrrole (PPy) nanofibers and chiral polyaniline (PANi) nanoarrays via in situ polymerization. Then, optimizing chiral structure and exploring new mechanism of enhanced attenuation were further applied. It was found that the ratio of chiral doped acids and Ani monomers could influence steric hindrance effect during induction process and then resulted in transforming growth pattern of chiral PANi. Therefore, breaking balance relationship of Nowadays, the rapidly development of advanced antidetection technology raises stringent requirements for microwave absorption materials (MAMs) to focus more attention on wider bandwidth, thinner thickness, and lower density. Adding magnetic medium to realize broadband absorption may usually result in the decline of service performance and accelerating corrosion of MAMs. Chiral MAMs can produce extra magnetic loss without adding magnetic medium due to the unique electromagnetic cross polarization effect. However, more efforts should be taken to furtherly promote efficient bandwidth of chiral MAMs and reveal attenuation mode and modulation method of chiral structure. Herein, a novel superhelical nano-microstructure based on chiral polyaniline and helical polypyrrole is suc...

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Response of Multistage‐Helical Nano‐Micro Conducting Polymer Structures and their Enhanced Attenuation Mechanism of Multiscale‐Chiral Synergistic Effect

et al. 2023

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“…S4 (ESI†) depicts the dielectric loss tangent (tan δ e = ε ′′/ ε ′) and the magnetic loss tangent (tan δ m = μ ′′/ μ ′), which represent the dielectric and magnetic loss capacities, respectively. 16,35 The changing trends of tan δ e and tan δ m resemble ε ′′ and μ ′′. The tan δ e values of ITO-15 and ITO-20 are larger than the tan δ m values, which proves that their dielectric loss abilities far exceed the magnetic loss abilities and an appropriate tan δ e is beneficial to the effective absorption and conversion of EM waves.…”

Section: Resultsmentioning

confidence: 99%

Indium tin oxide as a dual-band compatible stealth material with low infrared emissivity and strong microwave absorption

Wan

et al. 2023

J. Mater. Chem. C

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“…The MA properties of a dielectric loss material are strongly connected to the real permittivity (ε′) and imaginary permittivity (ε″). , In general, the ε′ indicates the capacity of a material to store electrical energy, while the ε″ represents its electrical-energy dissipation ability . It can be seen in Figure a that the ε′ values of samples are reduced with increasing frequency from 12.11 to 9.54, from 16.28 to 8.38, and from 20.91 to 10.39.…”

Section: Resultsmentioning

confidence: 99%

“…63,64 In general, the ε′ indicates the capacity of a material to store electrical energy, while the ε″ represents its electrical-energy dissipation ability. 65 It can be seen in Figure 6a that the ε′ values of samples are reduced with increasing frequency from 12.11 to 9.54, from 16.28 to 8.38, and from 20.91 to 10.39. Simultaneously, the ε″ values of S1 (Figure 6b) decrease gradually from 4.09 to 3.16, and S2 and S3 varied in the range of 8.51−3.88 and 13.57−7.29, respectively.…”

Section: Ma Performance Of C-gns/anf Filmsmentioning

confidence: 99%

Flexible and Ultrathin Graphene/Aramid Nanofiber Carbonizing Films with Nacre-like Structures for Heat-Conducting Electromagnetic Wave Shielding/Absorption

Xiang

Zhai

et al. 2023

ACS Appl. Mater. Interfaces

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Electromagnetic interference (EMI) shielding and electromagnetic wave absorption (EWA) materials with good thermal management and flexibility properties are urgently needed to meet the more complex modern service environment, especially in the field of smart wearable electronics. How to balance the relation of electromagnetic performance, thermal management, flexibility, and thickness in material design is a crucial challenge. Herein, graphene nanosheets/aramid nanofiber (C-GNS/ANF) carbonizing films with nacre-like structures were fabricated via the blade-coating/carbonization procedure. The ingenious configuration from highly ordered alignment GNS interactively connected by a carbonized ANF network can effectively improve the thermal/electrical conductivity of a C-GNS/ANF film. Specifically, the ultrathin C-GNS/ANF film with a thickness of 17 μm shows excellent in-plane thermal conductivity (TC) of 79.26 W m–1 K–1 and superior EMI shielding up to 56.30 dB. Moreover, the obtained C-GNS/ANF film can be used as a lightweight microwave absorber, achieving excellent microwave absorption performance with a minimum reflection loss of −56.07 dB at a thickness of 1.5 mm and a maximum effective absorption bandwidth of 5.28 GHz at an addition of only 5 wt %. Furthermore, the C-GNS/ANF films demonstrate good flexibility, outstanding thermal stability, and flame retardant properties. Overall, this work indicates a prospective direction for the development of the next generation of electromagnetic wave absorption/shielding materials with high-performance heat conduction.

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Facile synthesis of nitrogen-doped porous Ni@C nanocomposites with excellent synergistically enhanced microwave absorption and thermal conductive performances

Cited by 38 publications

References 71 publications

Electromagnetic Response of Multistage‐Helical Nano‐Micro Conducting Polymer Structures and their Enhanced Attenuation Mechanism of Multiscale‐Chiral Synergistic Effect

Electromagnetic Response of Multistage‐Helical Nano‐Micro Conducting Polymer Structures and their Enhanced Attenuation Mechanism of Multiscale‐Chiral Synergistic Effect

Indium tin oxide as a dual-band compatible stealth material with low infrared emissivity and strong microwave absorption

Flexible and Ultrathin Graphene/Aramid Nanofiber Carbonizing Films with Nacre-like Structures for Heat-Conducting Electromagnetic Wave Shielding/Absorption

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