Cobalt nanoparticles encapsulated in a nitrogen and oxygen dual-doped carbon matrix as high-performance microwave absorbers

2019 ◽  
Vol 6 (9) ◽  
pp. 2472-2480 ◽  
Author(s):  
Sifan Zeng ◽  
Mengyu Wang ◽  
Wanlin Feng ◽  
Lini Zhu ◽  
Zhen Teng ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Magnetic Loss ◽  
Carbon Matrix ◽  
Cobalt Nanoparticles ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbers ◽  
Loss Mechanisms

Co@NOC composites showed impressive microwave absorption properties owing to multiple dielectric and magnetic loss mechanisms.

Fabrication and Microwave Characteristics of Fe3O4/C Composites

2012 ◽  
Vol 430-432 ◽  
pp. 146-149 ◽  
Author(s):  
Wen Wang ◽  
Cheng Guo Wang ◽  
Yu Guo
Keyword(s):  
Microwave Absorption ◽  
Magnetic Loss ◽  
Carbon Matrix ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
X Ray ◽  
Heat Treated ◽  
Different Temperatures ◽  
Microwave Characteristics

Fe3O4/C composites were prepared by using Fe and polyacrylonitrile (PAN) as precursors, and then heat-treated at temperatures of 600,700 and 800 °C, respectively. The phase composition of the composites at different temperatures was analyzed by X-ray diffraction, and Fe reacted with O from PAN to form Fe3O4, which contributed to the improvement of magnetic loss of the carbon matrix. Electromagnetic and microwave absorption properties of the composites were investigated. The results show that the values of real and imaginary part of permittivity were all increased as the temperature increasing, and also the microwave absorption capability was improved.

scholarly journals Synthesis of nitrogen-doped graphene wrapped SnO2 hollow spheres as high-performance microwave absorbers

RSC Advances ◽  
2019 ◽  
Vol 9 (19) ◽  
pp. 10745-10753 ◽  
Author(s):  
Weiyong Dai ◽  
Hui Luo ◽  
Fu Chen ◽  
Xian Wang ◽  
Ying Xiong ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Hollow Sphere ◽  
High Performance ◽  
Hollow Spheres ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbers ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Nitrogen-doped graphene/SnO2 hollow sphere hybrids were synthesized and show high-performance microwave absorption properties.

Bio-inspired fabrication of hierarchical Ni–Fe–P coated skin collagen fibers for high-performance microwave absorption

2015 ◽  
Vol 17 (3) ◽  
pp. 2113-2120 ◽  
Author(s):  
Xiaoling Wang ◽  
Xuepin Liao ◽  
Wenhua Zhang ◽  
Bi Shi
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Collagen Fiber ◽  
Collagen Fibers ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Skin Collagen

Skin collagen fiber (CF) was employed for the bio-inspired fabrication of high-performance microwave absorption materials. To enhance the microwave absorption properties of CF, the well defined hierarchical 3D fibrous CF structure was covered with a Ni–Fe–P coating.

scholarly journals Microwave Absorption Properties of Magnetite Particles Extracted from Nickel Slag

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2162
Author(s):  
Pengze Yan ◽  
Yongqian Shen ◽  
Xueyan Du ◽  
Junkai Chong
Keyword(s):  
Electron Microscopy ◽  
Ball Milling ◽  
Microwave Absorption ◽  
Photoelectron Spectroscopy ◽  
Magnetic Loss ◽  
Interfacial Polarization ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
X Ray ◽  
Transmission Electron

The utilization of nickel slag has attracted much attention due to its high-content of valuable elements. As a part of these efforts, this work focuses on whether magnetite crystals, obtained from nickel slag via molten oxidation, magnetic separation, and ball-milling can be used as a microwave absorber. The composition, morphology, microstructure, magnetic properties, and microwave absorption performance were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), and vector network analysis (VNA). The results reveal that the magnetite crystals exhibit excellent microwave absorption properties because of the synergistic action between dielectric loss and magnetic loss. The minimum reflection loss (RL) of the particles obtained after 6 h ball-milling reaches −34.0 dB at 16.72 GHz with thickness of 5 mm. The effective frequency bandwidth (RL ≤ −10 dB) is 4.8–5.4 GHz and 15.9–17.6 GHz. Interfacial polarization of the particles could play a crucial role in improving absorbing properties because several components contained in the particles can dissipate electromagnetic wave effectively. The current study could show great potential in the preparation of magnetite crystals and utilization of nickel slag.

High-performance microwave absorption of flexible nanocomposites based on flower-like Co superstructures and polyvinylidene fluoride

RSC Advances ◽  
2015 ◽  
Vol 5 (68) ◽  
pp. 55468-55473 ◽  
Author(s):  
Xiao-Juan Zhang ◽  
Guo-Cheng Lv ◽  
Guang-Sheng Wang ◽  
Tian-Yu Bai ◽  
Jia-Kang Qu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Polyvinylidene Fluoride ◽  
High Performance ◽  
Absorption Properties ◽  
Microwave Absorption Properties

In this research, the flexible Co/PVDF nanocomposites with excellent microwave absorption properties were firstly prepared.

Synthesis, characterization, magnetic and microwave absorption properties of iron–cobalt nanoparticles and iron–cobalt @ polyaniline (FeCo@PANI) nanocomposites

2018 ◽  
Vol 29 (14) ◽  
pp. 12126-12134 ◽  
Author(s):  
Mehdi Rahimi-Nasrabadi ◽  
Mohammad Hosein Mokarian ◽  
Mohammad Reza Ganjali ◽  
Mohammad Almaci Kashi ◽  
Sima Alikhanzadeh Arani
Keyword(s):  
Microwave Absorption ◽  
Cobalt Nanoparticles ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Iron Cobalt

Preparation and Investigation of Co-Dispersed MWCNT Buckypaper for the Microwave Absorption

2013 ◽  
Vol 479-480 ◽  
pp. 20-24 ◽  
Author(s):  
Lakshmanan Saravanan ◽  
Jih Hsin Liu ◽  
Hsin Yuan Miao ◽  
Li Chih Wang
Keyword(s):  
Microwave Absorption ◽  
Cobalt Nanoparticles ◽  
Frequency Range ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Filtration Method ◽  
X Ray ◽  
Multi Walled Carbon Nanotube ◽  
Co Nanoparticles

The paper deals with the preparation of cobalt nanoparticles dispersed multi walled carbon nanotube buckypaper by the dispersion and filtration method to study the electromagnetic (microwave) absorption properties. From the X-ray diffraction the crystallite size of the cobalt nanoparticles of 33.04 nm was calculated. FESEM image clearly indicates the presence of cobalt nanoparticles in the buckypaper. Microwave-absorbing properties were investigated in terms of measuring the transmission coefficient (S21) with MWCNT-buckypaper as the absorber using microstrip line in a frequency range of 2–20 GHz. Compared to the pure buckypaper the absorption peak of the Co-CNT composites move to the lower frequency by dispersing the Co nanoparticles into the MWCNT-BP.

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