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Ultra-broadband microwave absorber and high-performance pressure sensor based on aramid nanofiber,polypyrrole and nickel porous aerogel

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1912-1921页

作者： Leyi Zhang Hongyu Jin Hanxin Liao Rao Zhang Bochong Wang Jianyong Xiang Congpu Mu Kun Zhai Tianyu Xue Fusheng Wen State Key Laboratory of Metastable Materials Science&Technology Yanshan UniversityQinhuangdao 066004China Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China

Electronic devices have become ubiquitous in our daily lives,leading to a surge in the use of microwave absorbers and wearable sensor devices across various sectors.A prime example of this trend is the aramid nanofibers/polypyrrole/nickel(APN)aerogels,which serve dual roles as both microwave absorbers and pressure *** this work,we focused on the preparation of aramid nanofibers/polypyrrole(AP15)aerogels,where the mass ratio of aramid nanofibers to pyrrole was 1:*** employed the oxidative polymerization method for the preparation *** this,nickel was thermally evaporated onto the surface of the AP15 aerogels,resulting in the creation of an ultralight(9.35 mg·cm^(-3)).This aerogel exhibited a porous *** introduction of nickel into the aerogel aimed to enhance magnetic loss and adjust impedance matching,thereby improving electromagnetic wave absorption *** minimum reflection loss value achieved was-48.7 dB,and the maximum effective absorption bandwidth spanned 8.42 GHz with a thickness of 2.9 *** impressive metrics can be attributed to the three-dimensional network porous structure of the aerogel and perfect impedance ***,the use of aramid nanofibers and a three-dimensional hole structure endowed the APN aerogels with good insulation,flame-retardant properties,and compression *** under a compression strain of 50%,the aerogel maintained its resilience over 500 *** incorporation of polypyrrole and nickel particles further enhanced the conductivity of the ***,the final APN aerogel sensor demonstrated high sensitivity(10.78 kPa-1)and thermal *** conclusion,the APN aerogels hold significant promise as ultra-broadband microwave absorbers and pressure sensors.

关键词： porous aerogel aramid nanofibers microwave absorbers pressure sensor porous structure

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Characterization of a Y-type hexagonal ferrite-based frequency tunable microwave absorber

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International Journal of Minerals,Metallurgy and Materials 2012年第5期19卷 453-456页

作者： Fang Xu Yang Bai Kai Jiang Li-jie Qiao College of Chemistry and Environmental Science Henan Normal University Xinxiang 453007 China Engineering Technology Research Center of Motive Power and Key Materials of Henan Province Xinxiang 453007 China Corrosion and Protection Center The Key Laboratory of the Ministry of Education of China for Environmental Fracture University of Science and Technology BeijingBeijing 100083 China

A Y-type hexaferrite rod with the composition of Ba2COl.8Cuo.2Fe12022 was presented as an absorbing material with high absorb- anee. Its high absorbance and wide absorption band result from ferromagnetic resonance （FMR） that is self-biased by strong shape and mag- netocrystaUine anisotropy fields. Around the FMR frequency the specimen of the ferrite rods exhibits very high absorbance and the FMR frequency can be tuned by the rod dimension. In addition to the high absorbance and the wide tunable absorption band, the microwave ab- sorber has another advantage of light weight due to the use of the ferrite rods instead of ferrite slabs.

关键词： hexagonal ferfite microwave materials microwave absorbers cobalt compounds ferromagnetic resonance

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microwave Absorbing Properties of Polymer Composites Containing High-permeability Magnetic Flake Particles in Quasi-microwave Frequency Band

Microwave Absorbing Properties of Polymer Composites Contain...

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2012 International Conference on Nano Materials and Electric Devices(ICNMED 2012)

作者： Sung-Soo Kim Department of Advanced Materials Engineering Chungbuk National University

This study investigates high-frequency magnetic, dielectric, and microwave absorbing properties of Sendust（Fe-Si-Al alloy） flake particles dispersed in rubber matrix for the design of thin microwave absorbers in quasi-microwave frequency band. At high particle loading（92% in weight） in the magnetic composite, reflection loss of-9 d B was obtained at 2 GHz with a small thickness of 1 mm. The result is attributed to the high values of magnetic permeability and dielectric constant of the composites resulting from a low eddy current loss（increase of permeability） of the flake particles and enhancement of space charge polarization（increase of permittivity） between the metallic particles. However, the investigation of impedance matching reveals that the magnetic permeability is still small to satisfy the zero-reflected condition at the quasi-microwave frequency band of 1-2 GHz with a composite thickness smaller than 1 mm. It is suggested that greater magnetic permeability（by control of composition and shape of magnetic particles） is required for more improved microwave absorbance at a quasi-microwave frequency.

关键词： microwave absorbers Sendust particles Magnetic permeability Polymer composites

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