Microwave absorption properties of helical carbon nanofibers-coated carbon fibers

Liu, Lei; He, Pingge; Zhou, Kechao; Chen, Tengfei

doi:10.1063/1.4818495

Cited by 23 publications

(15 citation statements)

References 20 publications

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“…The moderate graphitization degree or proper content of defects for carbon-based materials has been confi rmed to be helpful for the attenuation of incident EM waves, because it could not only improve the matched characteristic impedance and prompt energy transition from contiguous states to Fermi level, but also introduce defect polarization relaxation and dipole relaxation. [ 8,15,43 ] In general, microwave absorption properties of an absorber are highly dependent on its EM parameters, including complex permittivity ( ε r = ε ′−j ε″ ) and complex permeability ( µ r = µ ′−j µ″ ), where the real parts of complex permittivity ( ε ′) and complex permeability ( µ ′) represent the storage capability of electric and magnetic energy, and imaginary parts ( ε″ and µ″ ) represent the loss capability of electric and magnetic energy. [ 44,45 ] Figure 3 a,b show the complex permittivity, including real parts ( ε′ ) and imaginary parts ( ε″ ), of rGO, ACMs, and rGO/ACMs/rGO in the range of 2.0-18.0 GHz.…”

Section: Resultsmentioning

confidence: 99%

Interfacially Engineered Sandwich‐Like rGO/Carbon Microspheres/rGO Composite as an Efficient and Durable Microwave Absorber

Wang

Qiang

et al. 2016

Adv Materials Inter

137

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EM pollution, because they can convert the EM energy into thermal energy or dissipate the EM waves through interference. [ 4,5 ] Among many kinds of microwave absorbers, carbon materials are always the most attractive candidates due to their tunable properties, relative low density, abundant resource, easy preparation, and low cost. Various carbon materials, e.g., carbon nanotubes (CNTs), carbon nanofi bers (CNF), carbon nanocoils, and mesoporous carbon, have been utilized to construct highly effective microwave absorbers in the past decades. [6][7][8][9][10][11][12] Although these carbon-based materials have made signifi cant progress in the fi eld of microwave absorption, some elaborate innovations on structure and components are still paving the way for exciting performance to satisfy the requirements of practical applications.Recently, graphene appeared as a fascinating material and grabbed worldwide attention, whose unprecedented physical and chemical properties derived from its unique 2D structure have promised great potential in many research fi elds. [ 13 ] Notably, high charge carrier mobility, extraordinary electrical and thermal conductivity also rendered graphene as a new microwave absorber, and it was found that reduced graphene oxide (rGO) provided superior microwave absorption to graphene oxide (GO). [ 14,15 ] However, sole graphene material suffers from limited loss mechanism caused by interfacial impedance mismatching, [ 15,16 ] thus it is usually employed as EM interference shielding material rather than EM absorbing material. [17][18][19] Incorporation of other lossy materials, especially magnetic metal and metal oxides, has been widely studied as the imperative solution to improve the matching of characteristic impedance and enhance the microwave absorption performance. [20][21][22][23][24][25][26][27][28][29] For example, graphene-coated Fe nanocomposites and Ni/graphene composites showed enhanced microwave absorption due to the charge transfer at metal/graphene interface and the polarization of free carriers; [ 20,21 ] Fe 3 O 4 /graphene, rGO-Fe 2 O 3 , and rGO/CNT-Fe 3 O 4 materials demonstrated optimum characteristic impedance and compatible dielectric and magnetic loss, which resulted in their strong refl ection loss in the frequency range of 12.0-16.0 GHz; [21][22][23] Graphene decorated with coreshell Fe@Fe 3 O 4 @ZnO nanoparticles was also fabricated, and Graphene-based composites offer immense potential for overcoming the challenges related to the performance, functionality, and durability in microwave absorption. In this study, a sandwich-like graphene-based composite is successfully fabricated by an interfacial engineering of amorphous carbon microspheres (ACMs) and reduced graphene oxide (rGO), with a structure of rGO/ACMs/rGO. The as-prepared rGO/ACMs/rGO composite presents comparable/superior refl ection loss characteristics in the frequency range of 2.0-18.0 GHz to previous composites of graphene and high-density magnetic particles. Electromagnetic parameters and simulation resu...

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Section: Resultsmentioning

confidence: 99%

Interfacially Engineered Sandwich‐Like rGO/Carbon Microspheres/rGO Composite as an Efficient and Durable Microwave Absorber

Wang

Qiang

et al. 2016

Adv Materials Inter

137

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“…Besides, the composite method is another effective way to improve microwave absorption properties. 39 The combination of the two approaches might be a potential researching design in the field of EM wave absorbers. In addition, compared with the original helical nanofiber and HCNFs, we have studied the RL performance of straight fibers including straight original nanofibers and straight carbon fibers.…”

Section: View Article Onlinementioning

confidence: 99%

Remarkable improvement in microwave absorption by cloaking a micro-scaled tetrapod hollow with helical carbon nanofibers

Jian

Chen

Zhou

et al. 2015

Phys. Chem. Chem. Phys.

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Helical nanofibers are prepared through in situ growth on the surface of a tetrapod-shaped ZnO whisker (T-ZnO), by employing a precursor decomposition method then adding substrate. After heat treatment at 900 1C under argon, this new composite material, named helical nanofiber-T-ZnO, undergoes a significant change in morphology and structure. The T-ZnO transforms from a solid tetrapod ZnO to a micro-scaled tetrapod hollow carbon film by reduction of the organic fiber at 900 1C. Besides, helical carbon nanofibers, generated from the carbonization of helical nanofibers, maintain the helical morphology. Interestingly, HCNFs with the T-hollow exhibit remarkable improvement in electromagnetic wave loss compared with the pure helical nanofibers. The enhanced loss ability may arise from the efficient dielectric friction, interface effect in the complex nanostructures and the micro-scaled tetrapod-hollow structure.

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“…Helical CNF-coated carbon fiber is an efficient material for microwave absorbers due to its chemical stability, low density and broad absorption characteristics. 64 Lightweight magnetic composites of glass-iron-carbon exhibit good microwave absorption over a wide frequency band. 65 Hong et al investigated microwave absorption properties of titanium carbonitride and found that thin microwave absorbers can be realized by optimal doping of carbon in the compound.…”

Section: Microwave Absorbersmentioning

confidence: 99%

“…Table IV gives a clear picture of different microwave-absorbing materials that have been discussed in this paper and their absorption characteristics. 64 8.2-18 2.5 Titanium carbonitride (TiN 0:2 C 0:8 ) 66 11.1-13.6 1.32 40 wt.% Silica-Ni-C composite Shelly hollow microspheres 67 5.7-18 2.4-4 2 wt.% CNT/rice husk ash composite 127 12.48-16.47 2 40 wt.% Rice husk/nontoxic glue binder 139 6.3-7.1 37.5 ( # pyrolysis temperature, *À20 dB absorption frequency bandwidth).…”

Section: Other Important Materialsmentioning

confidence: 99%

Applications of Microwave Materials: A Review

Raveendran

Sebastian

Raman

2019

Journal of Elec Materi

147

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The performance of microwave devices mainly depends on the properties of materials used in the fabrication. Knowledge of material properties at microwave frequencies is a prerequisite to select suitable materials for various microwave applications and vice versa. In this review, seven categories of materials and their applications in a microwave regime are elaborately discussed. The categories include magnetic materials, carbon-based materials, flexible or stretchable materials, biomaterials, phantoms, tunable materials and metamaterials. A brief overview of other important microwave materials such as low-loss ceramic dielectric materials, low-loss polymer ceramic composites, glass ceramics and multilayer ceramics is also given. The objective of this review is to expose the world of materials for wide microwave applications and thereby properly assisting the material selection for specific applications. Moreover, this review has dual significance. It helps material scientists to develop new materials and modify the properties of the available materials with respect to the application requirements. It also assists microwave engineers to select and use appropriate materials for different microwave applications.

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Microwave absorption properties of helical carbon nanofibers-coated carbon fibers

Cited by 23 publications

References 20 publications

Interfacially Engineered Sandwich‐Like rGO/Carbon Microspheres/rGO Composite as an Efficient and Durable Microwave Absorber

Interfacially Engineered Sandwich‐Like rGO/Carbon Microspheres/rGO Composite as an Efficient and Durable Microwave Absorber

Remarkable improvement in microwave absorption by cloaking a micro-scaled tetrapod hollow with helical carbon nanofibers

Applications of Microwave Materials: A Review

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