Lightweight ferroferric oxide nanotubes with natural resonance property and design for broadband microwave absorption

2017 ◽  
Vol 52 (13) ◽  
pp. 8258-8267 ◽  
Author(s):  
Peng He ◽  
Zhi-Ling Hou ◽  
Kai-Lun Zhang ◽  
Jun Li ◽  
Kai Yin ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Resonance Property ◽  
Ferroferric Oxide ◽  
Natural Resonance

Solvothermal Synthesis of Reduced Graphene Oxide/Ferroferric Oxide Hybrid Composites with Enhanced Microwave Absorption Properties

NANO ◽  
2017 ◽  
Vol 12 (12) ◽  
pp. 1750144 ◽  
Author(s):  
Ruiwen Shu ◽  
Meng Wang ◽  
Yingying Yang ◽  
Siyu Chang ◽  
Gengyuan Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Microwave Absorption ◽  
Hybrid Composite ◽  
Hybrid Composites ◽  
Absorption Characteristic ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Ferroferric Oxide ◽  
Reduced Graphene

In this work, reduced graphene oxide (RGO)/ferroferric oxide (RGO/Fe3O4) hybrid composite was successfully fabricated by a facile one-step solvothermal method. The structure, chemical composition, morphology and magnetic properties of the samples were investigated in detail. Fe3O4 microspheres with an average diameter of 250[Formula: see text]nm were uniformly anchored on the surface of the RGO sheets without large aggregation. Moreover, the results demonstrated that the hybrid composite exhibited obviously enhanced microwave absorption properties compared with the pure Fe3O4 microspheres. The minimum reflection loss (RL) of the hybrid composite reached [Formula: see text]36.8[Formula: see text]dB at 17.2[Formula: see text]GHz with a thickness of 5.0[Formula: see text]mm and its effective absorption bandwidth (lower than [Formula: see text]10[Formula: see text]dB) was 3.9[Formula: see text]GHz with a thickness of 2.5[Formula: see text]mm. Significantly, the hybrid composite exhibited a dual-waveband absorption characteristic covering the C and Ku bands. Besides, the relationship between the matching thickness and peak frequency was reasonably explained according to the quarter-wavelength matching theory. Therefore, the obtained composite was a promising candidate for application in microwave absorption.

scholarly journals Natural Resonance Phenomena and GHz-range Microwave Absorption of the (Y1-xSmx)2Fe14B Compound.

2003 ◽  
Vol 50 (1) ◽  
pp. 63-67 ◽  
Author(s):  
Toru Maeda ◽  
Nobuki Tezuka ◽  
Toshio Kagotani ◽  
Satoshi Sugimoto ◽  
Koichiro Inomata
Keyword(s):  
Microwave Absorption ◽  
Resonance Phenomena ◽  
Natural Resonance

Enhanced microwave absorption properties of ferroferric oxide/graphene composites with a controllable microstructure

RSC Advances ◽  
2016 ◽  
Vol 6 (21) ◽  
pp. 16952-16962 ◽  
Author(s):  
Rui Zhang ◽  
Xiaoxiao Huang ◽  
Bo Zhong ◽  
Long Xia ◽  
Guangwu Wen ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Ferroferric Oxide ◽  
Solid Spheres ◽  
Controlled Structures

With experimentally controlled structures from ring-like, flower-like to solid spheres for nanoparticles, the Fe3O4/graphene composites show excellent microwave absorption properties.

Microwave wide band absorption by carbon from Corn cob-1

2016 ◽  
Vol 12 (2) ◽  
pp. 4204-4212 ◽  
Author(s):  
Maheshwar Sharon ◽  
Ritesh Vishwakarma ◽  
Abhijeet Rajendra Phatak ◽  
Golap Kalita ◽  
Nallin Sharma ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Agricultural Waste ◽  
Wide Band ◽  
Nickel Nitrate ◽  
Equivalent Amount ◽  
Frequency Range ◽  
Corn Cob ◽  
Different Temperatures ◽  
Band Absorption ◽  
5 Ghz

Corn cob, an agricultural waste, is paralyzed at different temperatures (700oC, 800oC and 900oC). Microwave absorption of carbon in the frequency range of 2 GHz to 8 GHz is reported. Carbon activated  with 5%  nickel nitrate showed more than 90% absorption of microwave in the frequency range from 6 GHz to 8 GHz, while carbon activated  with 10% Nickel nitrate treated corn cob showed 90% absorption  in the frequency range of 2.5 GHz to 5 GHz. Carbon showing the best absorption are characterized by XRD, Raman spectra and SEM . It is suggested that corn cob treatment   alone with KOH did not improve the microwave absorption, whereas treatment along with nickel nitrate improved the absorption property much better. It is proposed that treatment with nickel nitrate helps in creating suitable pores in carbon   which improved the absorption behavior because while treating carbon with 1N HCl helps to leach out nickel creating equivalent amount of pores in the carbon.

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