Tunable Pearl Necklace Structured TiO2 Spheres on Carbon Nanotubes with Enhanced Electromagnetic Wave Absorption Performance

2020 ◽  
Vol 12 (10) ◽  
pp. 1433-1440
Author(s):  
Shengnan Li ◽  
Mu Zhang
Keyword(s):  
Electromagnetic Wave ◽  
Coating Thickness ◽  
Impedance Matching ◽  
Interfacial Polarization ◽  
Absorption Frequency ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Conduction Loss ◽  
Loading Ratio ◽  
Absorbing Property

Due to the low density and high conduction loss of carbonaceous materials, they have been considered as candidates for compositing electromagnetic wave absorbing materials. In this study, the well-designed CNT@TiO2 composites with pearl necklace structure were successfully synthesized via a facile hydrolyzation method. The absorption performances of CNT@TiO2 under different loading ratio were characterized and showed significantly different performance on the electromagnetic wave absorption. The reflection loss value reaches to –47.5 dB in the pearl necklace structured CNT@TiO2 composites obtained with a thickness of 1.6 mm at 11.2 GHz. An effective absorption bandwidth was found to reach to 4.2 GHz with a coating thickness of 1.4 mm. More, the absorption frequency range can be diverse by adjusting coating thickness. We deduce that promising electromagnetic wave absorbing property of the composites is related to the interfacial polarization induced by pearl necklace structure, improved impedance matching, conduction loss and scattering within the materials.

Graphene–carbonyl iron cross-linked composites with excellent electromagnetic wave absorption properties

2014 ◽  
Vol 2 (32) ◽  
pp. 6582-6591 ◽  
Author(s):  
Zetao Zhu ◽  
Xin Sun ◽  
Hairong Xue ◽  
Hu Guo ◽  
Xiaoli Fan ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Carbonyl Iron ◽  
Framework Structure ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
The Cross ◽  
Absorbing Property

A carbon-bridge effect was adopted to explain the electromagnetic wave absorbing property related to the cross-linked framework structure of RGO–SCI composites.

Synthesis of core-shell Co@S doped carbon@ mesoporous N doped carbon nanosheets with hierarchically porous structure for strong electromagnetic wave absorption

2021 ◽  
Author(s):  
Bo Wen ◽  
Haibo Yang ◽  
Ying Lin ◽  
Liang Ma ◽  
Yun Qiu ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Interfacial Polarization ◽  
Positive Influence ◽  
Shell Structures ◽  
Core Shell ◽  
Carbon Nanosheets ◽  
Electromagnetic Wave Absorption ◽  
Hierarchically Porous ◽  
Wave Absorption ◽  
Hierarchically Porous Structure

Electromagnetic wave absorbents with hierarchically porous and core-shell structures have significantly positive influence on electromagnetic wave absorption because of the enhanced interfacial polarization. Furthermore, the core-shell structure also introduces components...

Electromagnetic wave absorption properties of a carbon nanotube modified by a tetrapyridinoporphyrazine interface layer

2017 ◽  
Vol 5 (30) ◽  
pp. 7479-7488 ◽  
Author(s):  
Luo Kong ◽  
Chen Wang ◽  
Xiaowei Yin ◽  
Xiaomeng Fan ◽  
Wei Wang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Nanotube ◽  
Impedance Matching ◽  
Interface Layer ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Surface Reflection ◽  
Wave Absorption ◽  
Matching Layer

The CoTAP impedance matching layer is assembled on the surface of CNTs, which can enhance EM absorption and decrease surface reflection.

scholarly journals Gamma Irradiation-Induced Preparation of Graphene–Ni Nanocomposites with Efficient Electromagnetic Wave Absorption

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2145 ◽  
Author(s):  
Youwei Zhang ◽  
Hui-Ling Ma ◽  
Ke Cao ◽  
Liancai Wang ◽  
Xinmiao Zeng ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electromagnetic Wave ◽  
Impedance Matching ◽  
Ni Nanoparticles ◽  
X Ray Diffraction ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Reduced Graphene ◽  
Gamma Radiolysis ◽  
Absorption Performance

A facile and environmentally friendly method is proposed to prepare reduced graphene oxide–nickel (RGO–Ni) nanocomposites using γ-ray irradiation. Graphene oxide (GO) and Ni2+ are reduced by the electrons which originated from the gamma radiolysis of H2O. The structure and morphology of the obtained RGO–Ni nanocomposites were analyzed using X-ray diffraction (XRD) and Raman spectroscopy. The results show that Ni nanoparticles were dispersed uniformly on the surface of the RGO nanosheets. As expected, the combination of RGO nanosheets and Ni nanoparticles improved the electromagnetic wave absorption because of the better impedance matching. RGO–Ni nanocomposites exhibited efficient electromagnetic wave absorption performance. The minimum reflection loss (RL) of RGO–Ni reached −24.8 dB, and the highest effective absorption bandwidth was up to 6.9 GHz (RL < −10 dB) with a layer thickness of 9 mm.

Scalable self-supported FeNi3/Mo2C flexible paper for enhanced electromagnetic wave absorption evaluated via coaxial, waveguide and arch methods

2020 ◽  
Vol 8 (30) ◽  
pp. 10204-10212
Author(s):  
Chen Wu ◽  
Kai Bi ◽  
Mi Yan
Keyword(s):  
Electromagnetic Wave ◽  
Impedance Matching ◽  
Coaxial Waveguide ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Absorption Performance ◽  
Multiple Loss ◽  
Loss Mechanisms

Scalable self-supported FeNi3/Mo2C flexible paper with satisfactory impedance matching and multiple loss mechanisms to allow excellent wave absorption performance.

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