Rationally designed hierarchical N-doped carbon nanotubes wrapping waxberry-like Ni@C microspheres for efficient microwave absorption

2021 ◽  
Author(s):  
Dawei Liu ◽  
Yunchen Du ◽  
Ping Xu ◽  
Fengyuan Wang ◽  
Yahui Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Composition ◽  
Microwave Absorption ◽  
Microstructure Design ◽  
Composition Modulation ◽  
Absorption Performance ◽  
Microwave Absorption Performance

The enhanced microwave absorption performance of composites benefits from simultaneous rational microstructure design and chemical composition modulation.

Enhanced Microwave Absorption Performance of Coated Carbon Nanotubes by Optimizing the Fe3O4 Nanocoating Structure

2017 ◽  
Vol 9 (3) ◽  
pp. 2973-2983 ◽  
Author(s):  
Na Li ◽  
Gui-Wen Huang ◽  
Yuan-Qing Li ◽  
Hong-Mei Xiao ◽  
Qing-Ping Feng ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Microwave Absorption ◽  
Absorption Performance ◽  
Coated Carbon ◽  
Microwave Absorption Performance

scholarly journals Correction to “Enhanced Microwave Absorption Performance of Coated Carbon Nanotubes by Optimizing the Fe3O4 Nanocoating Structure”

2018 ◽  
Vol 10 (22) ◽  
pp. 19278-19278 ◽  
Author(s):  
Na Li ◽  
Gui-Wen Huang ◽  
Yuan-Qing Li ◽  
Hong-Mei Xiao ◽  
Qing-Ping Feng ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Microwave Absorption ◽  
Absorption Performance ◽  
Coated Carbon ◽  
Microwave Absorption Performance

In-situ synthesis of layered coal-based carbon/Co porous magnetic composites with promising microwave absorption performance

2021 ◽  
Author(s):  
Yang Fan ◽  
Ximing Zhang ◽  
Jingyu Wang ◽  
Hengdong Ren ◽  
Yin Liu ◽  
...  
Keyword(s):  
Phase Composition ◽  
Chemical Composition ◽  
Microwave Absorption ◽  
In Situ Synthesis ◽  
Magnetic Composites ◽  
Microwave Absorbing Properties ◽  
In Situ Method ◽  
Absorption Performance ◽  
Microwave Absorption Performance

In this paper, light and ultra-thin coal-based carbon cobalt composites (CBC/Co) with excellent microwave absorbing properties were synthesized by using an in-situ method from anthracite. Phase composition and chemical composition...

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.

Microwave Absorption and Magnetic Properties of Cobalt Ferrites/Carbon Nanotubes Nanocomposites

NANO ◽  
2015 ◽  
Vol 10 (05) ◽  
pp. 1550070 ◽  
Author(s):  
B. B. Zhang ◽  
P. F. Wang ◽  
J. C. Xu ◽  
Y. B. Han ◽  
H. X. Jin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Properties ◽  
Microwave Absorption ◽  
Network Analyzer ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Cobalt Ferrites ◽  
Structure Morphology ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Owing to the unique microstructure and the excellent dielectric properties, carbon nanotubes (CNTs) were decorated with CoFe 2 O 4 nanoparticles to synthesize the CoFe 2 O 4/CNTs nanocomposites by the solvothermal method. The phase structure, morphology, magnetic properties and microwave absorption performance of the as-prepared CoFe 2 O 4/CNTs were characterized and discussed by X-ray diffraction (XRD), thermal gravity analysis (TGA), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and vector network analyzer (VNA). All results indicated that the diameter of CoFe 2 O 4 nanoparticles decorating on the surface of CNTs increased with the solvothermal temperature. CoFe 2 O 4/CNTs prepared at 180°C, 200°C and 220°C exhibited superparamagnetism, while the other samples presented ferromagnetism at room temperature. And with the increasing solvothermal temperature, the saturation magnetization and coercivity increased up to 72 emu/g and 2000 Oe for the sample prepared at 260°C (S-26). And the reflection loss of CoFe 2 O 4/CNTs nanocomposites increased with the solvothermal temperature up to -15.7 dB for S-26 with the bandwidth of 2.5 GHz.

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