Comparison of Carbon-Based Nano Materials as Conductive Fillers for Single Layer Microwave Absorber

2007 ◽  
pp. 837-840
Author(s):  
Jin Bong Kim ◽  
Sang Kwan Lee ◽  
Chun Gon Kim
Keyword(s):  
Single Layer ◽  
Microwave Absorber ◽  
Nano Materials ◽  
Conductive Fillers ◽  
Carbon Based

Comparison of Carbon-Based Nano Materials as Conductive Fillers for Single Layer Microwave Absorber

2007 ◽  
Vol 334-335 ◽  
pp. 837-840 ◽  
Author(s):  
Jin Bong Kim ◽  
Sang Kwan Lee ◽  
Chun Gon Kim
Keyword(s):  
Frequency Band ◽  
Composite Laminates ◽  
Single Layer ◽  
The Real ◽  
Nano Fiber ◽  
Conductive Fillers ◽  
Absorber Solution ◽  
Carbon Nano Tube ◽  
Filled Composite ◽  
Carbon Based

In this paper, we have studied the permittivities of E-glass fabric/epoxy composite laminates containing three different types of carbon-based nano conductive fillers such as carbon black (CB), carbon nano fiber (CNF) and multi-wall carbon nano tube (MWNT). The measurements were performed for permittivities at the frequency band of 0.5 GHz ~ 18.0 GHz using a vector network analyzer with a 7 mm coaxial air line. The experimental results show that the complex permittivities of the composites depend strongly on the natures and concentrations of the conductive fillers. The real and imaginary parts of the complex permittivities of the composites were proportional to the filler concentrations. But, depending on the types of fillers and frequency band, the increasing rates of the real and imaginary parts with respect to the filler concentrations were all different. At the frequency of 10 GHz, the rates in the CNF filled composite and the MWNT filled composite were much larger then those of the CB filled composite. Between the CNF filled composite and MWNT filled composite, however, the former showed a little higher increasing rates than the other. These different rates can have great effect on the thickness in designing the single layer microwave absorbers. The effect of the different rates was examined by using Cole-Cole plots; the plot is composed of a single layer absorber solution line and permittivity lines of these three types of composites.

scholarly journals The Simulation Design of Microwave Absorption Performance for the Multi-Layered Carbon-Based Nanocomposites Using Intelligent Optimization Algorithm

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1951
Author(s):  
Danfeng Zhang ◽  
Congai Han ◽  
Haiyan Zhang ◽  
Bi Zeng ◽  
Yun Zheng ◽  
...  
Keyword(s):  
Layer Structure ◽  
Optimal Solution ◽  
Single Layer ◽  
Simulation Design ◽  
Wide Bandwidth ◽  
Abc Algorithm ◽  
Bee Colony ◽  
Absorbing Material ◽  
Important Means ◽  
Carbon Based

The optimal design objectives of the microwave absorbing (MA) materials are high absorption, wide bandwidth, light weight and thin thickness. However, it is difficult for single-layer MA materials to meet all of these requirements. Constructing multi-layer structure absorbing coating is an important means to improve performance of MA materials. The carbon-based nanocomposites are excellent MA materials. In this paper, genetic algorithm (GA) and artificial bee colony algorithm (ABC) are used to optimize the design of multi-layer materials. We selected ten kinds of materials to construct the multi-layer absorbing material and optimize the performance. Two algorithms were applied to optimize the two-layer MA material with a total thickness of 3 mm, and it was found that the optimal bandwidth was 8.12 GHz and reflectivity was −53.4 dB. When three layers of MA material with the same thickness are optimized, the ultra-wide bandwidth was 10.6 GHz and ultra-high reflectivity was −84.86 dB. The bandwidth and reflectivity of the optimized material are better than the single-layer material without optimization. Comparing the GA and the ABC algorithm, the ABC algorithm can obtain the optimal solution in the shortest time and highest efficiency. At present, no such results have been reported.

scholarly journals The development of a magnetic iron/nitrogen-doped graphitized carbon composite with boosted microwave attenuation ability as the wideband microwave absorber

2021 ◽  
Author(s):  
Cong Chen ◽  
Wen Chen ◽  
Bing Zong ◽  
Xiaohai Ding ◽  
Haitao Dong
Keyword(s):  
Dielectric Loss ◽  
Carbon Composite ◽  
Microwave Absorber ◽  
Nitrogen Doped ◽  
Graphitized Carbon ◽  
Microwave Attenuation ◽  
Magnetic Carbon ◽  
Carbon Based

Magnetic carbon-based composites have been attractive candidates for electromagnetic (EM) absorption due to their dual magnetic and dielectric loss ability.

Microwave Absorbing Performance and Infrared Emissivity of Co-Doped ZnO

2011 ◽  
Vol 399-401 ◽  
pp. 880-885
Author(s):  
Shu Yuan Zhang ◽  
Quan Xi Cao
Keyword(s):  
Double Layer ◽  
Single Layer ◽  
Microwave Absorber ◽  
Dual Band ◽  
Network Analyzer ◽  
Infrared Emissivity ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Co Doped

In this paper the powders of Zn1-xCoxO (x=0, 0.01, 0.02, 0.025, 0.05, 0.1) were fabricated by the conventional solid state reaction. The crystal structure was characterized by x-ray diffraction (XRD). The electromagnetic parameters were measured using vector network analyzer (VNA), the infrared emissivity in the wavelength range of 3-5μm and 8-14μm was measured by Dual-band infrared emissivity measuring instrument. The absorption bandwidth of the double-layer microwave absorber is obviously more than that of the single-layer absorber. The bandwidth of the double-layer microwave absorber for reflection loss R<-8dB is 2.64GHz over the range of 8.2-18GHz. The thickness of the absorbers is only 4 mm. The infrared emissivity is only 0.39 in the range of 3-5μm and 0.81 in the range of 8-14μm.

Porous-carbon-based Mo2C nanocomposites as excellent microwave absorber: a new exploration

Nanoscale ◽  
2018 ◽  
Vol 10 (15) ◽  
pp. 6945-6953 ◽  
Author(s):  
Sisi Dai ◽  
Yan Cheng ◽  
Bin Quan ◽  
Xiaohui Liang ◽  
Wei Liu ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Porous Carbon ◽  
Carbothermal Reduction ◽  
Microwave Absorber ◽  
Microwave Absorbing ◽  
Carbon Based

The as-obtained porous-carbon-based Mo2C nanocomposites via typical carbothermal reduction exhibit outstanding dielectric loss and microwave absorbing performance by resorting to the suitable mechanisms.

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