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

作　　者：Leyi Zhang Hongyu Jin Hanxin Liao Rao Zhang Bochong Wang Jianyong Xiang Congpu Mu Kun Zhai Tianyu Xue Fusheng Wen 

机构地区：[1]State Key Laboratory of Metastable Materials Science&Technology,Yanshan University,Qinhuangdao 066004,China [2]Key Laboratory for Microstructural Material Physics of Hebei Province,School of Science,Yanshan University,Qinhuangdao 066004,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第8期1912-1921,共10页矿物冶金与材料学报（英文版）

基　　金：The authors acknowledge the financial support from the National Natural Science Foundation of China(Nos.52071280 and 51972280);the Natural Science Foundation of Hebei Province,China(Nos.E2020203151 and E2022203208);the Research Program of the College Science&Technology of Hebei Province,China(No.ZD2020121);the Cultivation Project for Basic Research and Innovation of Yanshan University,China(No.2021LGZD016).

摘　　要：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 sensors.In this work,we focused on the preparation of aramid nanofibers/polypyrrole(AP15)aerogels,where the mass ratio of aramid nanofibers to pyrrole was 1:5.We employed the oxidative polymerization method for the preparation process.Following 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 structure.The introduction of nickel into the aerogel aimed to enhance magnetic loss and adjust impedance matching,thereby improving electromagnetic wave absorption performance.The 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 mm.These impressive metrics can be attributed to the three-dimensional network porous structure of the aerogel and perfect impedance matching.Moreover,the use of aramid nanofibers and a three-dimensional hole structure endowed the APN aerogels with good insulation,flame-retardant properties,and compression resilience.Even under a compression strain of 50%,the aerogel maintained its resilience over 500 cycles.The incorporation of polypyrrole and nickel particles further enhanced the conductivity of the aerogel.Consequently,the final APN aerogel sensor demonstrated high sensitivity(10.78 kPa-1)and thermal stability.In 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 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TQ427.26[自动化与计算机技术—控制科学与工程]