Preparation of graphene/Fe3O4/Ni electromagnetic microwave absorbing nano-composite materials

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940055 ◽  
Author(s):  
Yu-Wei Huang ◽  
Yu-Jiang Wang ◽  
Shi-Cheng Wei ◽  
Yi Liang ◽  
Wei Huang ◽  
...  
Keyword(s):  
Composite Materials ◽  
Photoelectron Spectroscopy ◽  
Network Analyzer ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Nano Composite ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
One Step ◽  
Microwave Absorbing

Graphene/Fe3O4/Ni nano-composite materials were prepared by one-step hydrothermal method from RGO, FeCl3 ⋅ 6H2O and purity Ni. The structure and electromagnetic microwave absorbing properties were investigated systematically by field emission scanning electron microscope (FESEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and vector network analyzer (VNA). The reflectance was simulated based on the electromagnetic parameters to evaluate the absorption properties of the sample. The results show that Fe3O4 and Ni are on the surface of graphene evenly, the composites exhibit excellent microwave absorption properties, reflection loss and broad effective absorption bandwidth are −16.38 dB and 3.60 GHz, as the paraffin wax is 40% and the matching thickness is 2.00–3.50 mm.

Prepared and Microwave-Absorption Properties Investigation of χ-C-Fe-Si/SiC Coated Fe Nanocapsules

2009 ◽  
Vol 79-82 ◽  
pp. 743-746 ◽  
Author(s):  
Gui Mei Shi ◽  
Jin Hu Zhang ◽  
Shu Lian ◽  
Ge Song ◽  
Jin Bing Zhang
Keyword(s):  
Electron Microscopy ◽  
Reflection Loss ◽  
Photoelectron Spectroscopy ◽  
Network Analyzer ◽  
Absorber Thickness ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
X Ray ◽  
Transmission Electron

-C-Fe-Si/SiC coated Fe nanocapsules were prepared by arc evaporating the mixture of Fe and SiC powders in He and H2 atmosphere, and their microstructure, surface compositions and electromagnetic(EM) properties(2–18GHz) were investigated by means of high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and network analyzer, respectively. The reflection loss R of less than –20 dB was obtained in the frequency range of 3.13–13.6 GHz with an absorber thickness of 2.0–5.5 mm. An optimal reflection loss of–37.2 dB was reached at 5.6GHz with an absorber thickness of 4.5mm. The microwave absorptive mechanisms of -C-Fe-Si/SiC coated Fe nanocapsules absorbent were discussed.

The Influence of Sintering Temperature and Mn-Ti Doped BaFe12O19 on the Microwave Absorbing Properties

2015 ◽  
Vol 754-755 ◽  
pp. 733-737
Author(s):  
M.N. Nasruddin ◽  
Tulus Ikhsan Nasution ◽  
M.S. Achmad ◽  
K. Candra ◽  
F.N. Lukman ◽  
...  
Keyword(s):  
Dopant Concentration ◽  
Sintering Temperature ◽  
Barium Hexaferrite ◽  
Solid State Reaction Method ◽  
Network Analyzer ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Magnetizing Force ◽  
Microwave Absorbing

The effect of sintering temperature and Mn-Ti (x = 0.1 and 0.5 % mol) doped in Barium hexaferrite (BaFe12O19) on the microwave absorption properties have been investigated. The BaFe(12-2x)MnxTixO19samples were prepared by using a solid state reaction method from technical grade materials of BaCO3, Fe2O3, MnO2, and TiO2. The permagraph and vector network analyzer (VNA) measurement with frequency of 4 – 10 GHz were used to determine the magnetic properties and microwave absorbing properties, respectively. The magnetic induction and magnetizing force (B-H) curve analysis of BaFe(12-2x)MnxTixO19revealed that by increasing the Mn-Ti dopant concentrations, the remanence (Br) and BH(max) increases, meanwhile, the HCBvalue decreases for both 1100 and 1150oC. The frequency dependence of reflection loss (RL) measurement given anoptimum value of-26.15 dB at frequency of 9.18 GHz which obtained by x = 0.1% mol Mn-Ti (1100oC). The maximum absorption peak was achieved for 0.5 % mol Mn-Ti sample with ~98.3 % at 9.18 GHz. By controlling the sintering temperature and Mn-Ti dopant concentration, the RL and absorption behavior can be modified to desirable values and also indicates that higher Mn-Ti dopant concentration (0.5% mol) possess better absorbing characteristics. Furthermore, it was found that complex permitivitty and permeability values of BaFe12O19can be modified by controlling the Mn-Ti dopant concentration.

Synthesis and Microwave-Absorbing Properties of Al2O3 Coated Polyhedral Fe Nanocapsules Prepared by Arc-Discharge Method

2011 ◽  
Vol 299-300 ◽  
pp. 739-742 ◽  
Author(s):  
Gui Mei Shi ◽  
Jin Bing Zhang ◽  
Da Wei Yu ◽  
Long Shan Chen
Keyword(s):  
Photoelectron Spectroscopy ◽  
Arc Discharge ◽  
Electromagnetic Properties ◽  
Al Alloy ◽  
Network Analyzer ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
X Ray ◽  
Transmission Electron ◽  
Discharge Method

Al2O3coated polyhedral Fe nanocapsules were prepared by arc-discharging a Fe-Al(8at%Al) alloy. High-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy, and network analyzer were employed to investigate the microstructures, compositions and electromagnetic properties (2-18GHz). The reflection loss R(dB) of the nanocapsules reaches to -50.5dB at 7.9GHz with a 3mm thickness, and EM absorption properties(RL<-20dB) in the 5.2~16.1GHz range with thickness range of 1.67-4.7mm. The excellent Microwave-absorption properties of as-prepared nanocapsules are ascribed to shape anisotropy and core/shell structure.

Prepared and Microwave-Absorption Properties of BN Coated Ni Nanocapsules

2010 ◽  
Vol 663-665 ◽  
pp. 1252-1255 ◽  
Author(s):  
Gui Mei Shi ◽  
Shu Lian ◽  
Ge Song ◽  
Jin Bing Zhang
Keyword(s):  
Reflection Loss ◽  
Electromagnetic Properties ◽  
Mechanochemical Reaction ◽  
Network Analyzer ◽  
Absorber Thickness ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
X Ray ◽  
Transmission Electron

BN coated Ni nanocapsules were prepared by arc evaporating Ni-B amorphous alloy powders synthesized by a mechanochemical reaction, and their microstructure, surface component as well as electromagnetic properties (2-18 GHz) were investigated by means of high-resolution transmission electron microscopy, X-ray diffraction , photoluminescence spectra (PL) and a network analyzer, respectively. The reflection loss R (dB) of the nanocapsules less than -20 dB was obtained in the frequency range of 4.3-18 GHz for an absorber thickness of 1.4-6 mm. An optimal reflection loss of -32.0 dB was reached at 13 GHz with an absorber thickness of 2 mm. The microwave absorptive mechanisms of BN-coated Ni nanocapsule absorbent were discussed.

Bimetallic MOF-derived porous CoNi/C nanocomposites with ultra-wide band microwave absorption properties

2019 ◽  
Vol 43 (42) ◽  
pp. 16546-16554 ◽  
Author(s):  
Chang Liu ◽  
Jing Qiao ◽  
Xue Zhang ◽  
Dongmei Xu ◽  
Nannan Wu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Fine Particles ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Target Product ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Microwave Absorbing ◽  
Distributed Elements

The CoNi bimetallic MOF-derived composites were synthesized in this work. The target product is composed of fine particles with uniformly distributed elements of Ni, Co, C. The CoNi/C-650 sample displays good microwave absorbing properties.

Microwave Absorbing Properties of FeXCo1-X(x=0.7, 0.8) Alloys with Spherical Nanoparticles

2011 ◽  
Vol 299-300 ◽  
pp. 484-488
Author(s):  
Fei Wang ◽  
Lian Zhu Zhang
Keyword(s):  
High Resistivity ◽  
Alloy Nanoparticles ◽  
Body Centered Cubic ◽  
Spherical Nanoparticles ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Fe Content ◽  
Bcc Structure ◽  
Microwave Absorbing

FexCo1-xalloys were prepared by low temperature hydrothermal method. The influence of Fe content on static magnetic and microwave absorbing properties was studied. XRD results show that FexCo1-xalloys are single-phased body-centered cubic (BCC) structure for both 70% and 80% Fe content. The lattice constant of the alloys increases with increasing Fe content. The coercivity decreases with the increase of Fe content. The composites with high resistivity were prepared by homogeneously mixing FexCo1-xalloy nanoparticles and paraffin wax, and their microwave absorption properties were studied.

Preparation and Characterization of Electroless Co-Ni Coated ZrO2 Powder for Microwave Absorbing

2010 ◽  
Vol 97-101 ◽  
pp. 1290-1294 ◽  
Author(s):  
Jing Hua Jiang ◽  
Fu Min Lu ◽  
Ai Bin Ma ◽  
Jin Zong Zuo ◽  
Yi Gao
Keyword(s):  
Ph Value ◽  
Weight Ratio ◽  
Average Weight ◽  
Network Analyzer ◽  
Absorption Properties ◽  
Plating Bath ◽  
Microwave Absorption Properties ◽  
Ni Alloy ◽  
Microwave Absorbing

Co-Ni coated ZrO2 composite powder was prepared by an optimized ultrasonic electroless plating process to obtain good microwave absorption properties in GHz region. Aggradation mechanism of electroless Co-Ni alloy was analyzed and the principal influencing factors on the depositing rate were investigated by weighting-in-powder. The metallized powder was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and vector network analyzer. Results showed that ultrafine ZrO2 powder pretreated with sensitization and activation were homogeneously deposited with Co-Ni coating at 358K and pH value of 9, immerged in the optimal plating bath using NaH2PO2 as reductant. The Co-Ni coating deposited in the alkaline plating bath had the depositing rate of above 6µm/h and the average weight ratio of 5.5 for Co/Ni. The new metallized powder was endowed high microwave absorbing properties; the maximum reflection loss reaches to -23dB at the frequency of 9.40 GHz.

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.

Synthesis and Microwave Absorbing Properties of Ni/SiO2 Core/Shell Particles

2010 ◽  
Vol 160-162 ◽  
pp. 945-950
Author(s):  
Bo Chong Wang ◽  
Tao Wang ◽  
Liang Qiao ◽  
Fa Shen Li
Keyword(s):  
Impedance Match ◽  
Core Shell ◽  
Frequency Range ◽  
Soft Magnetic ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Hydrolysis Method ◽  
Microwave Absorbing ◽  
Shell Particles

In this paper, we report on the microwave absorbing properties of the Ni/SiO2 core/shell soft magnetic material which was synthesized by the tetraethyl orthosilicate (TEOS) hydrolysis method. The SEM patterns were shown that the particles of Ni/SiO2 were more dispersed and homogeneous. Microwave absorbing properties were measured in the range of 0.1–18 GHz. A reflection loss (RL) exceeding −20 dB in the frequency range of 2.6–8.9 GHz was achieved for an absorber thickness of 2.0–5.6 mm, and an optimal RL of −49.5 dB was obtained at 4.4 GHz for the thickness of 3.5 mm. The good microwave absorption properties resulted from a proper impedance match as a consequence of the insulator SiO2 around Ni particles.

scholarly journals Characterization, Production and Microwave Absorbing Properties of Polyaniline-NiFe2O4: Tb Composites

2019 ◽  
Vol 25 (3) ◽  
pp. 322-327
Author(s):  
Ethem İlhan ŞAHIN ◽  
Selcuk PAKER ◽  
Mesut KARTAL
Keyword(s):  
Structural Analysis ◽  
Nickel Ferrite ◽  
Single Phase ◽  
Second Phase ◽  
Network Analyzer ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
Microwave Absorbing

In this study, terbium-doped NiFe2O4 was produced by using mixed oxide technique. The Ni1-xTbxFe2O4 composition was synthesized and x was selected as 0.025, 0.050 and 0.070, respectively. The single phase Ni ferrite was produced after sintering at 1250 °C for 4 h. X-ray diffraction (XRD), scanning Electron Microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were performed for the structural analysis. The results of the structural analysis indicated that second phase did not form in Ni1-xTbxFe2O4. Additionally, the polyaniline-terbium doped NiFe2O4 composites were produced by hot pressing using the compositions of Ni0.975Tb0.025Fe2O4.018, Ni0.950Tb0.050Fe2O4.037, Ni0.93Tb0.070Fe2O4.0525 and aniline. The weight ratios of terbium-doped nickel ferrite and aniline were 1:1 and 1:3 respectively and epoxy resin was used to produce microwave absorbing composites. The magnetic properties of fabricated composites were investigated using a vibrating sample magnetometer (VSM). The microwave absorbing performances of Polyaniline-NiFe2O4: Terbium composites were investigated by reflectivity in 0 – 8 GHz using two–port vector network analyzer. A minimum of – 39.41 dB reflection performance was obtained in 7.9 GHz at the thickness of 2.0 mm. This reflection performance can be modulated simply by controlling the content of polyaniline in the samples for the required frequency bands. DOI: http://dx.doi.org/10.5755/j01.ms.25.3.20810

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