Well-Dispersed Ni Nanoparticles Loaded on Uniform Hollow N-Doped Carbon Spheres for Outstanding Microwave Absorption Performance at a Low Filler Loading

2021 ◽  
Author(s):  
Weixing Min ◽  
Dongxuan Liu ◽  
Ping Chen ◽  
Xiaoyu Zhu ◽  
Hongfang Qiu
Keyword(s):  
Microwave Absorption ◽  
Filler Loading ◽  
Ni Nanoparticles ◽  
Carbon Spheres ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Synthesis of Fe@Ni nanoparticles-modified graphene/epoxy composites with enhanced microwave absorption performance

2017 ◽  
Vol 29 (4) ◽  
pp. 3348-3357 ◽  
Author(s):  
Bin Zhang ◽  
Jun Wang ◽  
Haoyuan Tan ◽  
Xiaogang Su ◽  
Siqi Huo ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Epoxy Composites ◽  
Ni Nanoparticles ◽  
Absorption Performance ◽  
Modified Graphene ◽  
Microwave Absorption Performance

scholarly journals 3D Seed-Germination-Like MXene with In Situ Growing CNTs/Ni Heterojunction for Enhanced Microwave Absorption via Polarization and Magnetization

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Xiao Li ◽  
Wenbin You ◽  
Chunyang Xu ◽  
Lei Wang ◽  
Liting Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Seed Germination ◽  
Microwave Absorption ◽  
Magnetic Loss ◽  
Impedance Matching ◽  
Matching Condition ◽  
Ni Nanoparticles ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Highlights Benefiting from the possible “seed-germination” effect, the “seeds” Ni2+ grow into “buds” Ni nanoparticles and “stem” carbon nanotubes (CNTs) from the enlarged “soil” of MXene skeleton. Compared with the traditional magnetic agglomeration, the MXene-CNTs/Ni hybrids exhibit the highly spatial dispersed magnetic architecture. 3D MXene-CNTs/Ni composites hold excellent microwave absorption performance (−56.4 dB at only 2.4 mm). Abstract Ti3C2Tx MXene is widely regarded as a potential microwave absorber due to its dielectric multi-layered structure. However, missing magnetic loss capability of pure MXene leads to the unmatched electromagnetic parameters and unsatisfied impedance matching condition. Herein, with the inspiration from dielectric-magnetic synergy, this obstruction is solved by fabricating magnetic CNTs/Ni hetero-structure decorated MXene substrate via a facile in situ induced growth method. Ni2+ ions are successfully attached on the surface and interlamination of each MXene unit by intensive electrostatic adsorption. Benefiting from the possible “seed-germination” effect, the “seeds” Ni2+ grow into “buds” Ni nanoparticles and “stem” carbon nanotubes (CNTs) from the enlarged “soil” of MXene skeleton. Due to the improved impedance matching condition, the MXene-CNTs/Ni hybrid holds a superior microwave absorption performance of − 56.4 dB at only 2.4 mm thickness. Such a distinctive 3D architecture endows the hybrids: (i) a large-scale 3D magnetic coupling network in each dielectric unit that leading to the enhanced magnetic loss capability, (ii) a massive multi-heterojunction interface structure that resulting in the reinforced polarization loss capability, confirmed by the off-axis electron holography. These outstanding results provide novel ideas for developing magnetic MXene-based absorbers.

scholarly journals Effect of Reaction Time on Microwave Absorption Properties of Fe3O4 Hollow Spheres Synthesized via Ostwald Ripening

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2921 ◽  
Author(s):  
Wei Huang ◽  
Yujiang Wang ◽  
Shicheng Wei ◽  
Bo Wang ◽  
Yi Liang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Microwave Absorption ◽  
Ostwald Ripening ◽  
Impedance Matching ◽  
Hollow Spheres ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Magnetic Structures ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Hollow magnetic structures have great potential to be used in the microwave absorbing field. Herein, Fe3O4 hollow spheres with different levels of hollowness were synthesized by the hydrothermal method under Ostwald ripening effect. In addition to their microstructures, the microwave absorption properties of such spheres were investigated. The results show that the grain size and hollowness of Fe3O4 hollow spheres both increase as the reaction time increases. With increasing hollowness, the attenuation ability of electromagnetic wave of Fe3O4 spheres increases first and then decreases, finally increases sharply after the spheres break down. Samples with strong attenuation ability can achieve good impedance matching, which it does preferentially as the absorber thickness increases. Fe3O4 hollow spheres show the best microwave absorption performance when the reaction time is 24 h. The minimum reflection loss (RL (min)) can reach −40 dB, while the thickness is only 3.2 mm.

Synthesis of novel hierarchical CoNi@NC hollow microspheres with enhanced microwave absorption performance

2021 ◽  
Vol 32 (6) ◽  
pp. 8000-8016
Author(s):  
Weixing Min ◽  
Dongwei Xu ◽  
Ping Chen ◽  
Guanzhen Chen ◽  
Qi Yu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Hollow Microspheres ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Sulfur‐doped biomass‐derived hollow carbon microtubes toward excellent microwave absorption performance

2021 ◽  
Vol 32 (5) ◽  
pp. 6260-6268
Author(s):  
Fei Huang ◽  
Shipeng Wang ◽  
Wei Ding ◽  
Min Zhang ◽  
Xiangkai Kong ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Absorption Performance ◽  
Hollow Carbon ◽  
Microwave Absorption Performance

Ultra-thin Al2O3−Sr(1−x)GdxTiO3 composite ceramics with high microwave absorption performance

2021 ◽  
Author(s):  
Yingying Zhou ◽  
Chaoqun Yang ◽  
Rong Li ◽  
Dan Chen ◽  
Zhaowen Ren ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Composite Ceramics ◽  
Absorption Performance ◽  
Microwave Absorption Performance
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