scholarly journals A New Broadband and Strong Absorption Performance FeCO3/RGO Microwave Absorption Nanocomposites

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2206 ◽  
Author(s):  
Wei Huang ◽  
Shicheng Wei ◽  
Yujiang Wang ◽  
Bo Wang ◽  
Yi Liang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Microwave Absorption ◽  
Solvothermal Method ◽  
Impedance Matching ◽  
Effective Bandwidth ◽  
Broad Absorption ◽  
Promising Candidate ◽  
Reduced Graphene ◽  
Absorption Performance

A novel composite of FeCO3 nanoparticles, which are wrapped with reduced graphene oxide (RGO), is fabricated using a facile one-spot solvothermal method. The composite consists of a substrate of RGO and FeCO3 nanoparticles that are embedded in the RGO layers. The experimental results for the FeCO3/RGO composite reveal a minimum refection loss (−44.5 dB) at 11.9 GHz when the thickness reaches 2.4 mm. The effective bandwidth is 7.9 GHz between 10.1 and 18 GHz when the refection loss was below −10 dB. Compared to GO and RGO, this type of composite shows better microwave absorption thanks to improved impedance matching. Overall, this thin and lightweight FeCO3/RGO composite is a promising candidate for absorbers that require both strong and broad absorption.

scholarly journals NiS2@MoS2 Nanospheres Anchored on Reduced Graphene Oxide: A Novel Ternary Heterostructure with Enhanced Electromagnetic Absorption Property

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 292 ◽  
Author(s):  
Zhi Zhang ◽  
Xuliang Lv ◽  
Yiwang Chen ◽  
Pin Zhang ◽  
Mingxu Sui ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Impedance Matching ◽  
Interfacial Polarization ◽  
Effective Bandwidth ◽  
Military Equipment ◽  
Electromagnetic Absorption ◽  
Reduced Graphene ◽  
Absorption Performance ◽  
Minimum Reflection Loss

For the purposes of strength, military equipment camouflage, and protecting the health of organisms, electromagnetic wave absorbing materials have received a lot of attention and are widely studied. In addition to having a strong absorption intensity and a wide effective absorption bandwidth, materials that are lightweight, thermally stable, and antioxidative are also highly desirable. In this study, we fabricated core–shell structured NiS2@MoS2 nanospheres anchored on reduced graphene oxide (rGO) nanosheets (NiS2@MoS2/rGO) by a simple two-step hydrothermal method. The combination ratio was adjusted to achieve proper impedance matching. The electromagnetic parameters and the absorption performance were investigated in detail. A composite loaded with 30 wt.% of the sample achieved a minimum reflection loss (RL) value of −29.75 dB and the effective bandwidth (RL value of less than −10 dB) ranged from 4.95 GHz to 18.00 GHz (13.05 GHz), with a thickness ranging from 1.5 mm to 4.0 mm. This study proved that the generated significant interfacial polarization and synergetic interaction between components can result in NiS2@MoS2/rGO composites with enhanced electromagnetic absorption performance.

scholarly journals Reduced graphene oxide decorated with octahedral NiS2/NiS nanocrystals: facile synthesis and tunable high frequency attenuation

RSC Advances ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 5550-5556 ◽  
Author(s):  
Min Lu ◽  
Na Gao ◽  
Xiao-Juan Zhang ◽  
Guang-Sheng Wang
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Microwave Absorption ◽  
High Frequency ◽  
High Frequency Range ◽  
Frequency Range ◽  
Facile Synthesis ◽  
Reduced Graphene ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Reduced graphene oxide (RGO) decorated with octahedral NiS2/NiS nanocrystals were fabricated and they possessed an excellent microwave absorption performance in the high frequency range.

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