Constructing hollow graphene nano-spheres confined in porous amorphous carbon particles for achieving full X band microwave absorption

Xu, Hailong; Yin, Xiaowei; Zhu, Meng; Li, Minghang; Zhang, Heng; Wei, Hanjun; Zhang, Litong; Cheng, Laifei

doi:10.1016/j.carbon.2018.10.056

Cited by 262 publications

(76 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, numerous functional groups of carbon‐heteroatoms (C‐N and C‐O) in the composite can be considered as the dipole active sites (Figure c,d). Their symmetry centers deviate somehow from the original balance points and thereby contribute to the intensive dipole polarization, which further facilitates the enhancement of microwave absorption performance 8a,23…”

Section: Resultsmentioning

confidence: 99%

Enhanced Microwave Absorption Performance from Magnetic Coupling of Magnetic Nanoparticles Suspended within Hierarchically Tubular Composite

Pei

Xing

et al. 2019

Adv Funct Materials

597

283

View full text Add to dashboard Cite

The microwave absorption (MA) performance of carbon materials is severely hindered by their drawbacks of lacking magnetic loss ability and mismatched electromagnetic impedance. In this work, utilizing sustainable biomass kapok as a template, the hierarchically tubular C/Co nanoparticle composite is rationally constructed to acquire the enhanced MA performance for the first time. The fruit‐tree‐like hierarchical structure is composed from a “trunk” of kapok‐derived carbon microtubes, a “branch” of entangled carbon nanotubes, and “fruit” of Co nanoparticles embedded in the nanotubes. Such a hierarchically tubular structure offers the composite: i) a submillimeter‐scale 3D magnetic coupling network and reinforced magnetic loss ability, ii) a hierarchical dielectric carbon network, iii) better matched impedance, confirmed by the off‐axis electron holography and micromagnetic simulation. Accordingly, the as‐prepared hierarchically tubular carbon composite demonstrates impressive MA performance, with a maximum reflection loss of as much as −52.3 dB and a broad absorption bandwidth of 5.1 GHz. These encouraging achievements light the way to the development of the hierarchical microstructure of magnetic absorbents.

show abstract

Section: Resultsmentioning

confidence: 99%

Enhanced Microwave Absorption Performance from Magnetic Coupling of Magnetic Nanoparticles Suspended within Hierarchically Tubular Composite

Pei

Xing

et al. 2019

Adv Funct Materials

597

283

View full text Add to dashboard Cite

show abstract

“…Polymeric composites, owing to their exibilities for structure design and property modulation, light weight, and good processability, have been widely used in the design and implementation of EWAMs. [4][5][6] Dielectric absorbents, such as carbon nanotubes (CNTs), [7][8][9] carbon bers (CFs), 10,11 and graphene and its derivatives, [12][13][14] due to their light weight, high conductivity, high aspect ratio, good resistance against corrosion, and excellent mechanical properties [15][16][17][18] have been added into polymer matrixes to achieve EW-absorbing properties. The most important features of these absorbents are their strong absorption capacity (reection loss, RL) and broad effective absorption bandwidth (EB, RL < À10 dB, for 90% energy absorption).…”

Section: Introductionmentioning

confidence: 99%

Retracted Article: A versatile strategy for alternately arranging the foam ratio layers of multilayer graphene/thermoplastic polyurethane composite foams towards lightweight and broadband electromagnetic wave absorption

Wang

Guo

2019

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…On the other hand, a proper impedance matching is favorable to make more microwave propagate into materials. When the value of |Z in /Z 0 | is equal to 1, it means that there is no any reflection of an incident wave at the air-absorber surface [37]. As shown in Additional file 1: Figure S7, the |Z in /Z 0 | values of HPSCs are close to 1 in the most range of 2~18 GHz.…”

Section: Resultsmentioning

confidence: 89%

Carbon Nanofibers Propped Hierarchical Porous SiOC Ceramics Toward Efficient Microwave Absorption

et al. 2020

View full text Add to dashboard Cite

The hierarchical porous SiOC ceramics (HPSCs) have been prepared by the pyrolysis of precursors (the mixture of dimethicone and KH-570) and polyacrylonitrile nanofibers (porous template). The HPSCs possess hierarchical porous structure with a BET surface area of 51.4 m 2 /g and have a good anti-oxidation property (only 5.1 wt.% weight loss). Owing to the porous structure, the HPSCs deliver an optimal reflection loss value of − 47.9 dB at 12.24 GHz and an effective absorption bandwidth of 4.56 GHz with a thickness of 2.3 mm. The amorphous SiOC, SiO x , and free carbon components within SiOC make contributions to enhancing dipolar polarization. Besides, the abundant interfaces between SiOC and carbon nanofibers (CNFs) are favorable for improving interfacial polarization. The conductive loss arisen from cross-linked CNFs can also boost the microwave absorption performance.

show abstract

Constructing hollow graphene nano-spheres confined in porous amorphous carbon particles for achieving full X band microwave absorption

Cited by 262 publications

References 46 publications

Enhanced Microwave Absorption Performance from Magnetic Coupling of Magnetic Nanoparticles Suspended within Hierarchically Tubular Composite

Enhanced Microwave Absorption Performance from Magnetic Coupling of Magnetic Nanoparticles Suspended within Hierarchically Tubular Composite

Retracted Article: A versatile strategy for alternately arranging the foam ratio layers of multilayer graphene/thermoplastic polyurethane composite foams towards lightweight and broadband electromagnetic wave absorption

Carbon Nanofibers Propped Hierarchical Porous SiOC Ceramics Toward Efficient Microwave Absorption

Contact Info

Product

Resources

About