Microwave absorption properties of carbon fibers with carbon coils of different morphologies (double microcoils and single nanocoils) grown on them

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

doi:10.1007/s10853-014-8137-z

Cited by 34 publications

(21 citation statements)

References 27 publications

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“…Lei Liu prepared single carbon nanocoils‐carbon fiber (SCNC‐CF) using ethyne as carbon resource, Ni and Ni/Al 2 O 3 as catalyst. When the thickness is 3.5 mm, the minimum reflection loss of it was −41.2 dB . Xiaoxia Wang prepared graphene/Ni(RG‐Ni) composite and results showed that it not only possessed magnetic‐loss ability but also dielectric‐loss ability.…”

Section: Resultsmentioning

confidence: 99%

“…Here, a new kind of four‐layer absorbing composite containing transparent layer, main absorbing layer, impedance matching layer, and magnetic‐loss absorbing layer was designed on the basis of our research and some other researchers’ achievements . On the one hand, this material possesses strong absorbency, broad absorbing bandwidth, thin thickness, and light weight; on the other hand, the four‐layer absorbing composite has multilayer structure microscopically (in main absorbing layer) and macroscopically, and the experimental derivation also provides a new idea for the development of the multilayer absorbing materials in the future.…”

Section: Introductionmentioning

confidence: 99%

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The Design and Electromagnetic‐Wave‐Absorbing Performance of a Broadband Four‐Layer Absorbing Composite

Shi

Qiu

2018

Annalen der Physik

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A four-layer absorbing composite on millimeter scale is designed containing an absorbent with multilayer-like structure on the microscale. In this four-layer absorbing composite, epoxy resin acts as transparent layer, the multilayer-like structure absorbent serves as the main absorbing layer; graphene/Ni composite acts as an impedance matching layer; and Fe 3 O 4 nanoparticles serve as a magnetic-loss absorbing layer. The reflection loss of the composites is simulated with CST Microwave Studio, and the absorbency of the composites is discussed in detail when the thickness of each layer is changed. The results show that when the thicknesses of the transparent layer, main absorbing layer, impedance matching layer, and magnetic-loss absorbing layer are 2.5, 2, 1.5, and 2 mm, respectively, the minimum reflection loss of the composite is −51.7 dB, the bandwidth below −10 dB reaches 11.82 GHz, and the density of the composite is nearly 1.9 g cm −3 . Therefore, this new four-layer absorbing composite possesses strong absorbency, broad absorbing bandwidth, thin thickness, and light weight. Thus, a new way to the development of multilayer absorbing composites is presented.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Design and Electromagnetic‐Wave‐Absorbing Performance of a Broadband Four‐Layer Absorbing Composite

Shi

Qiu

2018

Annalen der Physik

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“…We point out that little attention has been paid thus far to the electromagnetic wave absorption characteristics of CNCs in the millimeter wave band (30-300 GHz), whereas those of carbon microcoils (CMCs), having a larger coil diameter than CNC, and CNCs in the lower frequency range (< 30 GHz) were examined extensively [2][3][4][5]. Against the backdrop, we conducted the measurement of the CNC's electromagnetic wave absorption characteristics in the frequency range of 5.6 to 40 GHz and 67 to 110 GHz by fabricating a radio wave absorber.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic wave absorption properties of carbon nanocoil composites in the millimeter waveband

Suda

Matsuo

Yoshii

et al. 2018

AIP Conference Proceedings

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Synthesis of N-hydroxysuccinimide from succinic acid and hydroxylammonium chloride using Amberlyst A21 as reusable solid base catalyst AIP Conference Proceedings 1929, 020017 (2018) Abstract. Carbon nanocoil (CNC) is a carbon nanofiber with helical shape. In this study, we fabricated CNC-based composites endowed with electromagnetic wave absorption property. CNCs were synthesized by chemical vapor deposition using acetylene as a precursor and Fe and SnO 2 particles as catalysts. The composites were produced by dispersing CNCs into epoxy resin or paraffin by ultrasonication, and then hardening a droplet of the solution on an aluminum substrate with ca. 2mm in specimen thickness. Paraffin was used as a solvent when producing the composites with the CNC concentration higher than or equal to 5wt.%; otherwise epoxy was used. The reflection ratio of the composites with different concentrations were measured by the free space method using lens antennas in frequency ranges of 5.6-40 and 67-110 GHz. The CNCs/epoxy composites of 0.1-1.0 wt.% showed poor reflection losses. The 10 wt.% CNCs/paraffin composite achieved a reflection loss of −32 dB at 79.2 GHz. Its bandwidth corresponding to the reflection loss below −20 dB was 4.85 GHz. The CNCs/paraffin composite also turned out to show a good absorption property in W band frequencies .

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“…Because the metal catalyst used for the formation of carbon nanomaterials could easily diffuse into the carbon substrate during reaction, the formation of carbon nanomaterial-based hybrid materials has been very difficult [14,15]. Up to now, only a few attempts, such as the injection-gas-flow on/off modulation method and the two-step method, have been made to address this drawback in the formation of CMC-based hybrid materials [3,16,17]. In the injection-gas-flow on/off modulation method, the growth of CNCs occurred directly on the surface of the CMCs [3].…”

Section: Introductionmentioning

confidence: 99%

“…In the injection-gas-flow on/off modulation method, the growth of CNCs occurred directly on the surface of the CMCs [3]. For the two-step method, Ni nanoparticles were first coated on the prepared carbon fibers by a precipitationreduction technique, and then CMCs were deposited on the surface of the Ni-nanoparticle-coated carbon fibers [16,17]. In the two-step method, the relatively large-sized carbon fibers were prepared first, and then the CMCs grown on the prepared carbon fibers.…”

Section: Introductionmentioning

confidence: 99%

Enhanced shielding effectiveness for electromagnetic wave radiation using carbon nanocoil - carbon microcoil hybrid materials

Kang¹

2017

SurfCoat Korea 2017 Conference Proceedings

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The hydrophobic-oleophilic mesh is prepared via simple and environmental friendly method by coating of encapsulation particle. The natural rubber-encapsulated silica ( NR/ SiO 2 ) can undergo the chemical reaction with fluoro-containing chemical under alkaline conditions at 6±2 °C to provide the NR/SiO 2 -encapsulated fluoroalkylsilane. Firstly, the natural rubber was encapsulated with inorganic silica shell using tetraethyl orthosilicate (TEOS) as a silica precursor. The thermal behavior of surface modified natural rubber from thermogravimetric analysis (TGA) showed the thermal stability enhancement of natural rubber after encapsulated with silica shell. The morphology of NR/SiO 2 from TEM image revealed rubber core covered by silica shell. Secondly, the process is integrated between NR/SiO 2 and fluoroalkylsilane group. The coating mesh exhibited hydrophobic-oleophilic characteristic with static water contact angle (WCA) value of 138° and oil contact angle (OCA) of 0°. The surface roughness of mesh from encapsulation particle coating was confirmed by SEM. The coating surface with these encapsulated particles, NR/SiO 2 -encapsulated with trimethoxy( 3,3,3-trifluoropropyl)silane (FAS-3) is applicable to use as coating material for oil/water separation

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Microwave absorption properties of carbon fibers with carbon coils of different morphologies (double microcoils and single nanocoils) grown on them

Cited by 34 publications

References 27 publications

The Design and Electromagnetic‐Wave‐Absorbing Performance of a Broadband Four‐Layer Absorbing Composite

The Design and Electromagnetic‐Wave‐Absorbing Performance of a Broadband Four‐Layer Absorbing Composite

Electromagnetic wave absorption properties of carbon nanocoil composites in the millimeter waveband

Enhanced shielding effectiveness for electromagnetic wave radiation using carbon nanocoil - carbon microcoil hybrid materials

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