Dual-Interfacial Polarization Enhancement to Design Tunable Microwave Absorption Nanofibers of SiC@C@PPy

2020 ◽  
Vol 2 (6) ◽  
pp. 1505-1513 ◽  
Author(s):  
Chang Xu ◽  
Fan Wu ◽  
Liqun Duan ◽  
Ziming Xiong ◽  
Yilu Xia ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Interfacial Polarization ◽  
Tunable Microwave

Carbon encapsulated nanoscale iron/iron-carbide/graphite particles for EMI shielding and microwave absorption

2017 ◽  
Vol 19 (34) ◽  
pp. 23268-23279 ◽  
Author(s):  
Rajeev Kumar ◽  
Harish Kumar Choudhary ◽  
Shital Patangrao Pawar ◽  
Suryasarathi Bose ◽  
Balaram Sahoo
Keyword(s):  
Microwave Absorption ◽  
Multiple Scattering ◽  
Metallic Iron ◽  
Iron Carbide ◽  
Interfacial Polarization ◽  
Emi Shielding ◽  
Graphite Particles ◽  
Iron Iron

Dispersed metallic-iron and dielectric-Fe3C nanoparticles in carbon globules facilitate multiple scattering and absorption of EM-waves through large interfacial polarization.

Designed 3D heterostructure by 0D/1D/2D hierarchy for low-frequency microwave absorption in the S-band

2022 ◽  
Author(s):  
Jun Zhou ◽  
Fan Guo ◽  
Jialiang Luo ◽  
Gazi Hao ◽  
Guigao Liu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Three Dimensional ◽  
Low Frequency ◽  
Microwave Absorber ◽  
Tunable Microwave ◽  
Frequency Tunable ◽  
Electromagnetic Pollution ◽  
Designed Synthesis

Developing a low-frequency tunable microwave absorber for the normal use of sophisticated electric devices is an urgent need for electromagnetic pollution. Herein, we report the designed synthesis of a three-dimensional...

scholarly journals Investigation of Microwave Absorption Performance of CoFe2O4/NiFe2O4/Carbon Fiber Composite Coated with Polypyrrole in X-Band Frequency

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 809
Author(s):  
Rozhin Sadeghi ◽  
Abbas Sharifi ◽  
Marta Orlowska ◽  
Isabelle Huynen
Keyword(s):  
Carbon Fiber ◽  
Microwave Absorption ◽  
In Situ Polymerization ◽  
Fiber Composite ◽  
Sol Gel ◽  
Interfacial Polarization ◽  
Microwave Absorber ◽  
Carbon Fiber Composite ◽  
Band Frequency ◽  
5 Ghz

The current research reports the preparation of a microwave absorber containing CoFe2O4/NiFe2O4/Carbon fiber (H/S/CF) coated with polypyrrole polymer (PPy@H/S/CF) through sol-gel and in-situ polymerization processes. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), vibrating sample magnetometer (VSM), and a vector network analyzer (VNA) are utilized to evaluate the features of the prepared composite. The microstructure analysis results revealed carbon fibers well decorated with submicron-size particles having hard/soft magnetic phases and thoroughly coated with polymer. The paraffin-based microwave absorber sample filled with 45 wt.% of PPy@H/S/CF has simultaneously both magnetic and dielectric losses in the 8.2–12.4  GHz frequency range. The absorber is used in a Salisbury screen configuration aiming at reducing the radar cross-section of objects. A minimum reflection loss of −55  dB at 10.6 GHz frequency with 5 GHz bandwidth is obtained for the sample with a 2  mm thickness. Different mechanisms, such as interfacial polarization, ferromagnetic resonance, and electron hopping, are the main factors for achieving such an appropriate microwave absorption. These results suggest that the PPy@H/S/CF composite is an ideal candidate for microwave absorption applications requiring high performance and low thickness.

Novel three-dimensional TiO2-Fe3O4@polypyrrole composites with tunable microwave absorption in the 2–40 GHz frequency range

2020 ◽  
Vol 55 (32) ◽  
pp. 15493-15509
Author(s):  
Fubin Liu ◽  
Cuiping Li ◽  
Xiaohui Jiang ◽  
Geoffrey I. N. Waterhouse ◽  
Cuijuan Xing ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Three Dimensional ◽  
Frequency Range ◽  
Tunable Microwave

Synthesis and Excellent Microwave Absorption Properties of ZnO/Fe3O4/MWCNTs Composites

NANO ◽  
2016 ◽  
Vol 11 (12) ◽  
pp. 1650139 ◽  
Author(s):  
Lei Wang ◽  
Honglong Xing ◽  
Zhenfeng Liu ◽  
Ziyao Shen ◽  
Xiang Sun ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Microwave Absorption ◽  
Photoelectron Spectroscopy ◽  
Wave Attenuation ◽  
Impedance Matching ◽  
Interfacial Polarization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zno Nanocrystals ◽  
Transmission Electron

ZnO nanocrystals were introduced into Fe3O4/MWCNTs composites to improve the impedance matching and electromagnetic (EM) wave attenuation of the system. The as-synthesized ZnO/Fe3O4/MWCNTs composites were characterized by X-ray diffraction, vibrating sample magnetometer, field-emission scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy. SEM and TEM images showed that Fe3O4 microspheres 100–200[Formula: see text]nm in size connected MWCNTs. Analysis of EM parameters revealed that the impedance matching of the ZnO/Fe3O4/MWCNTs composites was considerably improved after ZnO nanocrystals were introduced. The ZnO/Fe3O4/MWCNTs composites exhibited a highly efficient microwave absorption (MA) capacity within the tested frequency range of 2–18[Formula: see text]GHz. The optimal reflection loss of EM waves was [Formula: see text][Formula: see text]dB at 6.08[Formula: see text]GHz with an absorber thickness of 3.5[Formula: see text]mm. The excellent MA properties of the composites could be attributed to the improved impedance matching, interfacial polarization, and combined effects of dielectric and magnetic losses.

Sign in / Sign up

Export Citation Format

Share Document