Grafting thin N-doped carbon nanotubes on hollow N-doped carbon nanoplates encapsulated with ultrasmall cobalt particles for microwave absorption

Li, Bei; Jia, Xu; Xu, Hongyi; Yan, Feng; Zhang, Xiao; Zhu, Chunling; Zhang, Xi-tan; Chen, Yujin

doi:10.1016/j.cej.2022.134846

Cited by 44 publications

(37 citation statements)

References 59 publications

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“…As a result, a higher magnetic loss ability is realized in FSF-800, especially for the magnetic attenuation portion. [50][51][52][53] The difference of MA performance in FSF-800 with diverse magnetic homogeneity further conrms the importance of multiscale magnetic couplings on broadening EAB. Aer annealing at 800 C, the homogeneity of transformed bulk iron particles is determined by the homogeneity of Fe 3 O 4 .…”

Section: Resultsmentioning

confidence: 99%

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Selective assembly of magnetic nano-antenna for electromagnetic dissipation

Fang

Zhao

et al. 2022

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 99%

“…S7d †). [53][54][55][56] By introducing a non-dielectric component of silica, the dielectric dissipation ability of the absorber undeniably declines. However, the dielectric loss can be increased again due to our designed structure.…”

Section: Resultsmentioning

confidence: 99%

Selective assembly of magnetic nano-antenna for electromagnetic dissipation

Fang

Zhao

et al. 2022

J. Mater. Chem. A

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“…Carbon materials such as carbon nanotubes and graphene have been applied as building blocks to create lightweight and multifunctional microwave absorbers due to their lightweight, conspicuous chemical and mechanical properties, high stability, etc. [ 17 , 18 ]. Numerous researchers have combined graphene with metallic compounds (ZnO, CeO 2 , MoS 2 , etc.)…”

Section: Introductionmentioning

confidence: 99%

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

et al. 2022

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Developing ultrabroad radar-infrared compatible stealth materials has turned into a research hotspot, which is still a problem to be solved. Herein, the copper sulfide wrapped by reduced graphene oxide to obtain three-dimensional (3D) porous network composite aerogels (CuS@rGO) were synthesized via thermal reduction ways (hydrothermal, ascorbic acid reduction) and freeze-drying strategy. It was discovered that the phase components (rGO and CuS phases) and micro/nano structure (microporous and nanosheet) were well-modified by modulating the additive amounts of CuS and changing the reduction ways, which resulted in the variation of the pore structure, defects, complex permittivity, microwave absorption, radar cross section (RCS) reduction value and infrared (IR) emissivity. Notably, the obtained CuS@rGO aerogels with a single dielectric loss type can achieve an ultrabroad bandwidth of 8.44 GHz at 2.8 mm with the low filler content of 6 wt% by a hydrothermal method. Besides, the composite aerogel via the ascorbic acid reduction realizes the minimum reflection loss (RLmin) of − 60.3 dB with the lower filler content of 2 wt%. The RCS reduction value can reach 53.3 dB m2, which effectively reduces the probability of the target being detected by the radar detector. Furthermore, the laminated porous architecture and multicomponent endowed composite aerogels with thermal insulation and IR stealth versatility. Thus, this work offers a facile method to design and develop porous rGO-based composite aerogel absorbers with radar-IR compatible stealth.

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“…Electromagnetic (EM) wave absorption materials have attracted considerable attention because of widely applications of electronic devices and communications facilities. [1][2][3][4][5] The EM wave absorption performances are strictly related to the complex permittivity (ε r ) and permeability (μ r ) and their impedance matching, which are mainly associated with dielectric loss capacities, [24] such as the honeycomb-like M-N x C, [25] hollow N-doped carbon nanoplates, [26] and N-doped graphene aerogels. [27] In this study, we achieved various hetero-substitutions in the nitrogen-substituted carbon nanocages (NCNs), including single Fe atoms, subnanometer Fe clusters, and Fe 3 O 4 nanoparticles, by carbonizing the metal-organic frameworks composites under proper temperatures.…”

Section: Introductionmentioning

confidence: 99%

Sub‐Nanometer Fe Clusters Confined in Carbon Nanocages for Boosting Dielectric Polarization and Broadband Electromagnetic Wave Absorption

Gao

Zhao

et al. 2022

Adv Funct Materials

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Compositing dielectric and magnetic components have been proven effective in optimizing electromagnetic (EM) wave absorption, in which the dielectric loss capacity can be reinforced by the polarization effects of hetero‐substitutions. Here, the dielectric polarization through the energy transformation between the relatively complex permeability and permittivity in nitrogen‐doped carbon nanocages (NCNs) with sub‐nanometer Fe clusters is further boosted. As a transition state between single Fe atoms and Fe3O4 nanoparticles hetero‐substitutions, these subnanometer Fe clusters confined in NCNs can be achieved by carbonizing FePc@ZIF‐8 composites at 900 °C. Benefitting from their unique structures, an enhanced dielectric loss tangent of 1.57 is obtained at 10 GHz, which is 3.0 and 1.6 times higher than those of single Fe atoms and Fe3O4 nanoparticles hetero‐substitutions, respectively. Furthermore, the minimum reflection loss can reach −64.75 dB at 7.1 GHz (2.7 mm) and the effective absorption bandwidth is 6.2 GHz (11.8–18 GHz, covering the full P‐band) at 1.7 mm. The present study provides intrinsic insight into the dielectric polarization behaviors in subnanometer hetero‐substitutions, inspiring the design of high‐performance EM absorption materials.

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Grafting thin N-doped carbon nanotubes on hollow N-doped carbon nanoplates encapsulated with ultrasmall cobalt particles for microwave absorption

Cited by 44 publications

References 59 publications

Selective assembly of magnetic nano-antenna for electromagnetic dissipation

Selective assembly of magnetic nano-antenna for electromagnetic dissipation

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

Sub‐Nanometer Fe Clusters Confined in Carbon Nanocages for Boosting Dielectric Polarization and Broadband Electromagnetic Wave Absorption

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