scholarly journals Microwave Absorption Performance of Graphene Nanoplatelets Dispersed SiC

2019 ◽  
Vol 69 (5) ◽  
pp. 437-441 ◽  
Author(s):  
Anil Kumar Maurya ◽  
Saurabh Mr ◽  
Samarjit Singh ◽  
Abhishek Kumar
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Graphene Nanoplatelets ◽  
Enhanced Absorption ◽  
Microwave Attenuation ◽  
Microwave Signals ◽  
Absorption Performance ◽  
Sic Composites ◽  
5 Ghz ◽  
Microwave Absorption Performance

Microwave absorption performance of graphene nanoplatelets based SiC composites have been studied in the present work. Graphene nanoplatelets were dispersed at varying weight fractions viz. 0.5, 1, 2, 2.5 and 3 wt.% in SiC using ultrasonication and ball milling methods. Microwave attenuation behaviour of the prepared composites have been observed in the 2-18 GHz range. The results reflect that dispersion of graphene in SiC proves to be very instrumental in attenuating the incident microwave signals translating into enhanced absorption. The enhancement in the microwave absorption performance is due to the presence of conductive graphene nanoplatelets which is very instrumental in promoting conduction and polarisation losses in the composite translating into enhanced absorption. For 3 wt.% graphene nanoplatelets dispersion in SiC, the value of reflection loss (RL) was obtained as -38.67 dB at 14.67 GHz frequency for 2.2 mm thickness with the corresponding bandwidth of 5 GHz.

Enhanced Microwave Absorption Performance of SWCNT/SiC Composites

2020 ◽  
Vol 49 (12) ◽  
pp. 7279-7291
Author(s):  
Samarjit Singh ◽  
Abhishek Kumar ◽  
Dharmendra Singh
Keyword(s):  
Microwave Absorption ◽  
Absorption Performance ◽  
Sic Composites ◽  
Microwave Absorption Performance

scholarly journals High-efficiency and ultra-thin electromagnetic wave absorption xAl2O3-(1-x)Sr0.85Gd0.15TiO3 ceramics in X-band

2020 ◽  
Author(s):  
Hui Xie ◽  
Chaoqun Yang ◽  
Yingying Zhou ◽  
Zhaowen Ren ◽  
Ping Liu
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
High Efficiency ◽  
Impedance Matching ◽  
Frequency Dispersion ◽  
Interfacial Polarization ◽  
Peak Frequency ◽  
Microwave Absorbing Materials ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Abstract xAl2O3-(1-x)Sr0.85Gd0.15TiO3(x=0.2, 0.3, 0.4, 0.5) ceramics were fabricated by hot-press sintering. Their morphology, phase composition, conductivity, dielectric properties as well as microwave absorption performance were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), multifunction digital four-probe meter and vector network analysis, respectively. The microwave absorption of as-prepared xAl2O3-(1-x)Sr0.85Gd0.15TiO3 ceramics demonstrates excellent microwave absorbability. It is unexpectedly found that with a thickness of only 0.346 mm, xAl2O3-(1-x)Sr0.85Gd0.15TiO3 (x=0.2) ceramic exhibits an absorption bandwidth of 3.7 GHz (8.7-12.4 GHz), being consequential to reflection loss less than -10 dB (over 90% of microwave absorption). It is as well discovered that the minimum reflection loss and absorption peak frequency of xAl2O3-(1-x)Sr0.85Gd0.15TiO3 (x=0.3) with a thickness of 0.436 mm were -45.43 dB and 11.3 GHz, respectively. The prominent microwave absorption performance of the ceramic with such a thin thickness can be attributed to strong interfacial polarization, dielectric frequency dispersion, and good electromagnetic impedance matching. It indicates that the xAl2O3-(1-x)Sr0.85Gd0.15TiO3 ceramics with appropriate Al2O3 mass fraction and thickness showing good potential for effective microwave absorbing materials.

Urchin-Like Ni Microspherical Structure with Enhanced Magnetic Loss for Thin Microwave Absorber at Gigahertz

NANO ◽  
2017 ◽  
Vol 12 (03) ◽  
pp. 1750034 ◽  
Author(s):  
Yuping Sun ◽  
Zhengwu Pan ◽  
Hongming Long ◽  
Siu Wing Or ◽  
S. L. Ho ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Chemical Reduction ◽  
Magnetic Loss ◽  
Synthetic Strategy ◽  
High Anisotropy ◽  
Absorption Performance ◽  
Wet Chemical ◽  
5 Ghz ◽  
Microwave Absorption Performance ◽  
Absorption Measurements

We describe in this report a wet chemical reduction synthetic strategy for synthesizing urchin-like Ni microspherical structures, in which the nanowires self-assembled by Ni nanoparticles with the size of 5–20[Formula: see text]nm are assembled in a radial form from the center to the surface of the spherical oriented arrays. Urchin-like Ni microspherical structures exhibit the strong magnetic natural resonance peak at 7.0[Formula: see text]GHz and superior magnetic loss at 2–18[Formula: see text]GHz, originated from relatively high anisotropy energy of urchin-like shape. Electromagnetic absorption measurements show that the urchin-like Ni microspherical structures possess outstanding microwave absorption performance at 2–18[Formula: see text]GHz. An optimal reflection loss of [Formula: see text]21.98[Formula: see text]dB can be observed at 17.4[Formula: see text]GHz with a matching thickness of 1.4[Formula: see text]mm and the effective absorption (below −10 dB, 90% absorption) bandwidth is 5 GHz (12–17 GHz) with a thickness of 1.7[Formula: see text]mm. The excellent microwave absorption performance may be attributed to the good impedance, large attenuation constant and novel magnetic loss ability.

Efficient microwave traps with markedly enhanced interfacial polarization and impedance matching enabled by dual-shelled, dual-cavity magnetic@dielectric hollow nanospheres

2020 ◽  
Vol 8 (46) ◽  
pp. 16489-16497
Author(s):  
Jiasong Hua ◽  
Wenjun Ma ◽  
Xiaoyun Liu ◽  
Qixin Zhuang ◽  
Zeyang Wu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Impedance Matching ◽  
Interfacial Polarization ◽  
Hollow Nanospheres ◽  
Absorption Performance ◽  
Microwave Absorption Performance ◽  
Magnetic Dielectric ◽  
Minimum Reflection Loss

Dual-shelled, dual-cavity Fe3O4@TiO2 hollow nanospheres exhibit an outstanding microwave absorption performance with a minimum reflection loss of −60.17 dB.

FeP nanoparticles: a new material for microwave absorption

2018 ◽  
Vol 2 (6) ◽  
pp. 1119-1125 ◽  
Author(s):  
Michael Green ◽  
Lihong Tian ◽  
Peng Xiang ◽  
James Murowchick ◽  
Xinyu Tan ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
New Material ◽  
Absorption Performance ◽  
Tunable Frequency ◽  
Microwave Absorption Performance

FeP nanoparticles, fabricated through a facile thermal phosphorization process, have displayed impressive microwave absorption performance with tunable frequency and large reflection loss (RL) values.

In situ regulating aspect ratio of bamboo-like CNTs via CoxNi1−x-catalyzed growth to pursue superior microwave attenuation in X-band

2019 ◽  
Vol 6 (1) ◽  
pp. 309-316 ◽  
Author(s):  
Yan Cheng ◽  
Jieming Cao ◽  
Hualiang Lv ◽  
Huanqin Zhao ◽  
Yue Zhao ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Microwave Absorption ◽  
Aspect Ratios ◽  
Microwave Attenuation ◽  
X Band ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Controlling aspect ratios of bamboo-like CNTs to achieve superior microwave absorption performance in X-band.

Two-dimensional nanosheets of MoS2: a promising material with high dielectric properties and microwave absorption performance

Nanoscale ◽  
2015 ◽  
Vol 7 (38) ◽  
pp. 15734-15740 ◽  
Author(s):  
Ming-Qiang Ning ◽  
Ming-Ming Lu ◽  
Jing-Bo Li ◽  
Zhuo Chen ◽  
Yan-Kun Dou ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Promising Material ◽  
Two Dimensional ◽  
Wide Bandwidth ◽  
Absorption Performance ◽  
High Dielectric ◽  
Microwave Absorption Performance ◽  
Minimum Reflection Loss

MoS2 nanosheets (MoS2-NS) exhibit a minimum reflection loss of −38.42 dB and a wide bandwidth with effective attenuation (<−10 dB) up to 4.1 GHz at a thickness of 2.4 mm.

Facile synthesis of a CNT@Fe@SiO2 ternary composite with enhanced microwave absorption performance

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 76836-76843 ◽  
Author(s):  
Hualiang Lv ◽  
Guangbin Ji ◽  
Haiqian Zhang ◽  
Youwei Du
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Core Structure ◽  
Pyrolysis Process ◽  
Facile Synthesis ◽  
Ternary Composite ◽  
Absorption Performance ◽  
Microwave Absorption Performance

The CNTs@Fe@SiO2 ternary core-structure was prepared by a simple two-step approach consisting a pyrolysis process and then decomposition. At a thin thickness of 1.5 mm, the optimal reflection loss value of the ternary composite is as high as −14.2 dB.

Ferromagnetic Co20Ni80 nanoparticles encapsulated inside reduced graphene oxide layers with superior microwave absorption performance

2019 ◽  
Vol 7 (10) ◽  
pp. 2943-2953 ◽  
Author(s):  
Xuefeng Yu ◽  
Lei Wang ◽  
Jiwei Liu ◽  
Shuyan Xue ◽  
Liting Yang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Oxide Layers ◽  
Absorption Bandwidth ◽  
Reduced Graphene ◽  
Microwave Loss ◽  
Absorption Performance ◽  
Microwave Absorption Performance

The size regulation of rGO/Co20Ni80 nanocomposites improves microwave loss properties in terms of the reflection loss value and absorption bandwidth.

scholarly journals Excellent microwave absorption properties by tuned electromagnetic parameters in polyaniline-coated Ba0.9La0.1Fe11.9Ni0.1O19/reduced graphene oxide nanocomposites

RSC Advances ◽  
2017 ◽  
Vol 7 (58) ◽  
pp. 36433-36443 ◽  
Author(s):  
Juhua Luo ◽  
Yue Zuo ◽  
Pan Shen ◽  
Zhu Yan ◽  
Kang Zhang
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Reduced Graphene ◽  
Absorption Performance ◽  
Microwave Absorption Performance ◽  
Minimum Reflection Loss

The obvious enhancement of microwave absorption performance of Ba0.9La0.1Fe11.9Ni0.1O19/reduced graphene oxide/polyaniline ternary nanocomposites in 2–18 GHz was observed. The minimum reflection loss can reach −49.1 dB with thickness of 1.9 mm.

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