Polyimide-based graphene composite foams with hierarchical impedance gradient for efficient electromagnetic absorption

2021 ◽  
Author(s):  
Lei Pu ◽  
Shuangshuang Li ◽  
Yawei Zhang ◽  
Haiyan Zhu ◽  
Wei Fan ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Absorption Capacity ◽  
Strong Absorption ◽  
Composite Foam ◽  
Broad Bandwidth ◽  
Graphene Composite ◽  
Electromagnetic Absorption ◽  
Composite Foams ◽  
Electromagnetic Pollution

The development of high-performance microwave absorption materials with strong absorption capacity and broad bandwidth is highly desirable in the field of electromagnetic pollution protection. Herein, polyimide/graphene composite foam with multi-hierarchical...

scholarly journals Facile Synthesis of Cobalt-Doped Porous Composites with Amorphous Carbon/Zn Shell for High-Performance Microwave Absorption

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 330 ◽  
Author(s):  
Qilei Wu ◽  
Huihui Jin ◽  
Bin Zhang ◽  
Siqi Huo ◽  
Shuang Yang ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Amorphous Carbon ◽  
Porous Carbon ◽  
High Performance ◽  
Impedance Matching ◽  
Broad Band ◽  
Matching Condition ◽  
Carbon Composite ◽  
Absorption Capacity ◽  
Zeolitic Imidazolate Framework

A facile method for the preparation of microwave absorbers with low density, high microwave absorptivity, and broad band is of paramount importance to the progress in practical application. Herein, commonly-used metal organic frameworks (MOFs) prepared just by mechanical stirring in methanol at room temperature were chosen as sacrificial templates to synthesize porous carbon composites with tunable dielectric and magnetic properties. With the replacement of Co atoms on the surface of zeolitic imidazolate framework-67 (ZIF-67) by Zn atoms, a Co-doped porous carbon composite with a low-dielectric amorphous carbon/Zn shell was constructed after annealing, leading to excellent impedance matching condition. Consequently, the as-obtained composite (Co/C@C-800) shows marvelous microwave absorption properties with an absorption capacity of −43.97 dB and a corresponding effective absorption bandwidth of 4.1 GHz, far exceeding that of the traditional porous carbon and composites directly derived from ZIF-67. The results provide a convenient way to modify MOFs for enhanced microwave absorption materials from the synergy of dielectric and magnetic losses.

Corrosive synthesis and enhanced electromagnetic absorption properties of hollow porous Ni/SnO2 hybrids

2015 ◽  
Vol 44 (36) ◽  
pp. 15984-15993 ◽  
Author(s):  
Biao Zhao ◽  
Wanyu Zhao ◽  
Gang Shao ◽  
Bingbing Fan ◽  
Rui Zhang
Keyword(s):  
Hybrid Composites ◽  
Strong Absorption ◽  
Light Weight ◽  
Absorption Properties ◽  
Broad Bandwidth ◽  
Electromagnetic Absorption

Porous hollow Ni/SnO2 hybrid composites exhibit superior properties with the features of strong absorption, thin thickness, broad bandwidth and light weight.

Ferromagnetic hierarchical carbon nanofiber bundles derived from natural collagen fibers: truly lightweight and high-performance microwave absorption materials

2015 ◽  
Vol 3 (39) ◽  
pp. 10146-10153 ◽  
Author(s):  
Xiaoling Wang ◽  
Xin Huang ◽  
Zerui Chen ◽  
Xuepin Liao ◽  
Chang Liu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Carbon Nanofiber ◽  
Collagen Fibers ◽  
Broad Bandwidth ◽  
Strong Intensity ◽  
Nanofiber Bundles ◽  
Hierarchical Carbon

High-performance microwave absorption materials with a broad bandwidth and strong intensity have significant applications in both civil and military areas.

scholarly journals Microwave-Boosted One-Step Synthesis of Nanocrystal N-Doped 2D Carbon/Ni Composite with High Electromagnetic Absorption Performance

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1718
Author(s):  
Pan Luo ◽  
Song Lyu ◽  
Bowen Zhang ◽  
Hui Wang ◽  
Yanping Zhou ◽  
...  
Keyword(s):  
Absorption Capacity ◽  
Sample Thickness ◽  
Relaxation Processes ◽  
Mixed Solution ◽  
Absorption Bandwidth ◽  
Electromagnetic Absorption ◽  
One Step ◽  
Absorption Performance ◽  
Electromagnetic Pollution ◽  
High Absorption

As the problems of electromagnetic pollution and interference are becoming increasingly serious, the development of electromagnetic absorption materials with a high absorption capacity and broad absorption bandwidth are stringently needed. In this work, an N-doped 2D carbon/Ni complex is synthesized through direct microwave irradiation on a mixed solution of nickel nitrate, urea, and agarose under N2. The electromagnetic absorption performance can be tuned by controlling the Ni content. Specifically, minimum reflection loss values (RLmin) of −65.5 dB at 15.8 GHz with an effective absorption bandwidth (EAB) of 4.2 GHz at a sample thickness of 1.47 mm, and −55.4 dB at 11.8 GHz with an EAB of 3 GHz at a sample thickness of 1.92 mm can be obtained. The outstanding performance of electromagnetic absorption is attributed to the multiple polarization relaxation processes and the synergistic effect between 2D carbon sheets and Ni particles.

scholarly journals MOF-derived Co@C nanoparticle anchored aramid nanofiber (ANF) aerogel for superior microwave absorption capacity

RSC Advances ◽  
2021 ◽  
Vol 11 (42) ◽  
pp. 26319-26325
Author(s):  
Xin Hao
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Absorption Capacity ◽  
Next Generation ◽  
Promising Candidate

The prepared Co@C/ANF aerogel is deemed to be a promising candidate for the next-generation of lightweight, reproducible, and high-performance MA materials.

Chiral induced synthesis of helical polypyrrole (PPy) nano-structures: a lightweight and high-performance material against electromagnetic pollution

2017 ◽  
Vol 5 (8) ◽  
pp. 2175-2181 ◽  
Author(s):  
Aming Xie ◽  
Fan Wu ◽  
Wanchun Jiang ◽  
Kun Zhang ◽  
Mengxiao Sun ◽  
...  
Keyword(s):  
Conducting Polymer ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Electromagnetic Interference Shielding ◽  
First Report ◽  
Nano Structures ◽  
Electromagnetic Absorption ◽  
Electromagnetic Pollution

First report on the excellent electromagnetic absorption and electromagnetic interference shielding performances of helical conducting polymer nano-structures.

3D porous biomass-derived carbon materials：biomass sources，controllable transformation and microwave absorption application

2021 ◽  
Author(s):  
Tian Li ◽  
Dandan Zhi ◽  
Zihao Guo ◽  
Jinzhe Li ◽  
Yao Chen ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Microwave Absorbers ◽  
Microwave Absorbing ◽  
Stealth Materials ◽  
Electromagnetic Pollution

Nowadays, to prevent acute electromagnetic pollution and develop efficient stealth materials, enormous efforts have been taken to pursuit high-performance microwave absorbing (MA) materials. Comparing to classical microwave absorbers, biomass-derived porous...

Electrostatic self-assembled two-dimensional magnetized MXene/hollow Fe3O4 nanoparticle hybrids with high electromagnetic absorption performance and improved impendence matching

2020 ◽  
Author(s):  
Baiwen Deng ◽  
Zhicheng Liu ◽  
Fei Pan ◽  
Zhen Xiang ◽  
Xiang Zhang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Strong Absorption ◽  
Two Dimensional ◽  
Fe3o4 Nanoparticle ◽  
Electromagnetic Absorption ◽  
Absorption Performance ◽  
Self Assembled ◽  
Electromagnetic Pollution

Electromagnetic pollution often interferes with the normal use of sophisticated electric devices leading to the urge of developing Electromagnetic wave absorbers with lightweight and strong absorption ability. Herein, we synthesized...

scholarly journals Development of sulfide, nitrogen co-doping hollow carbon with wideband electromagnetic absorption capability

RSC Advances ◽  
2020 ◽  
Vol 10 (38) ◽  
pp. 22570-22577
Author(s):  
Wenli Bao ◽  
Cong Chen ◽  
Zhenjun Si
Keyword(s):  
High Performance ◽  
Research Interest ◽  
Co Doping ◽  
Electromagnetic Absorption ◽  
Hollow Carbon ◽  
Electromagnetic Pollution ◽  
Global Research

Exploration of an economic, easy-producing method to develop high-performance electromagnetic absorber has been a global research interest, owing to the increasingly electromagnetic pollution and interference.

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