Nanowires/nanohelices hybrid carbon aerogels as the lightweight and hydrophobic microwave absorbers with excellent electrothermal properties

Liu, Disheng; Mou, Pengpeng; Wei, Qiyi; Xu, Yang; Wan, Gengping; Wang, Guizhen

doi:10.1016/j.carbon.2022.12.038

Cited by 23 publications

(4 citation statements)

References 75 publications

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“…The pentagram signifying the experimental t m agrees well with the simulated line, which was plotted by the quarter‐wavelength (λ/4) matching theory (Equation S7 , Supporting Information). [ 42 ] This indicates that the strong MA of NCP samples satisfies the λ/4 matching theory, which suggests an interference‐type loss.…”

Section: Resultsmentioning

confidence: 87%

Ni‐Carbon Microtube/Polytetrafluoroethylene as Flexible Electrothermal Microwave Absorbers

Wu,

Wang,

Shi

et al. 2023

Advanced Science

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Flexible microwave absorbers with Joule heating performance are urgently desired to meet the demands of extreme service environments. Herein, a type of flexible composite film is constructed by homogeneously dispersing a hierarchical Ni‐carbon microtube (Ni/CMT) into a processable polytetrafluoroethylene (PTFE) matrix. The Ni/CMT are interconnected into a 3D conductive network, in which the huge interior cavity of the carbon microtube (CMT) improves impedance matching and provides additional hyper channels for electromagnetic (EM) waves dissipation, and the hierarchical magnetic Ni nanoparticles enhance the synergistic interactions between confined heterogeneous interfaces. Such an ingenious structure endows the composites with excellent electrothermal performance and improves their serviceability for application under extreme environments. Moreover, under a low fill loading of 3 wt.%, the Ni/CMT/PTFE (NCP) can achieve excellent low‐frequency microwave absorption (MA) property with a minimum reflection loss of −59.12 dB at 5.92 GHz, which covers almost the entire C‐band. Relying on their brilliant MA property, an EM sensor is designed and achieved by the resonance coupling of the patterned NCP. This work opens up a new way for the design of next‐generation microwave absorbers that meet the requirements of EM packaging, proofing water and removing ice, fire safety, and health monitoring.

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Section: Resultsmentioning

confidence: 87%

Ni‐Carbon Microtube/Polytetrafluoroethylene as Flexible Electrothermal Microwave Absorbers

Wu,

Wang,

Shi

et al. 2023

Advanced Science

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“…The intrinsic EW attenuation ability may be described by the attenuation constant (α) . As illustrated in Figure e, the α of all samples increase with the increase of frequency, which demonstrates strong microwave attenuation of these materials . The α of S2 is significantly higher than 300 due to its high electrical conductivity.…”

Section: Resultsmentioning

confidence: 94%

“…19 As illustrated in Figure 6e, the α of all samples increase with the increase of frequency, which demonstrates strong microwave attenuation of these materials. 69 The α of S2 is significantly higher than 300 due to its high electrical conductivity. As shown in Figures 6f and S12, the orange points represent the real matching thickness at f m obtained from the experimental data, whereas the black curve represents the simulated thickness computed using the quarter-wavelength method.…”

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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“…have mature preparation techniques and large absorption peaks, but they are limited in practical applications because of their poor high-temperature resistance, poor environmental tolerance, and unbalanced impedance. − Especially nowadays, when the electromagnetic environment is becoming more and more complex and the demand for MAMs is increasing, research on MAMs is particularly important. Among many candidate materials, carbon materials, such as graphene, , carbon nanotubes, , mesoporous carbon, − carbon fibers, , and carbon aerogels, , with excellent physicochemical stability, diverse microstructures and morphologies, low densities, and high electrical conductivities, which can be obtained with strong dielectric losses and compatibility with other materials, show great potential in the field of MAMs. , Meanwhile, the interface effect is helpful for enhancing electromagnetic wave transmission, expanding effective absorption bandwidths, and improving impedance matching …”

Section: Introductionmentioning

confidence: 99%

Enhanced Microwave Absorption Performance of α-FeOOH Nanorods on Carbon Aerogel Powder

Du,

Wang,

et al. 2023

ACS Appl. Nano Mater.

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High-performance microwave absorbers are mainly based on reasonable microstructural designs and composition regulation. Herein, a broadband microwave absorber was obtained by a two-step hydrothermal method. Notably, the transformation of MnO 2 nanosheets to α-FeOOH nanorods was successfully realized on carbon aerogel powder, and the microwave absorption effect of the absorber can be adjusted in three-band absorption (S, X, and Ku bands) by changing the thickness of the absorber. The results show that the minimum reflection loss (RL min ) of the α-FeOOH/CA composite is −38 dB at a frequency of 13.28 GHz, and the corresponding effective absorption bandwidth of less than −10 dB could completely cover the Ku band. This study provides a new idea for designing carbon aerogel powder microwave absorbers reasonably and for adjusting impedance effectively.

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Nanowires/nanohelices hybrid carbon aerogels as the lightweight and hydrophobic microwave absorbers with excellent electrothermal properties

Cited by 23 publications

References 75 publications

Ni‐Carbon Microtube/Polytetrafluoroethylene as Flexible Electrothermal Microwave Absorbers

Ni‐Carbon Microtube/Polytetrafluoroethylene as Flexible Electrothermal Microwave Absorbers

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

Enhanced Microwave Absorption Performance of α-FeOOH Nanorods on Carbon Aerogel Powder

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