Transparent electromagnetic absorption film derived from the biomass derivate  

作　　者：Bohan Zhang Jiacheng Cui Dapeng He Jiaming Zhang Lieji Yang Wei Zhu Hualiang Lv 

机构地区：[1]State Key Laboratory of New Textile Materials and Advanced Processing Technologies,Wuhan Textile University,Wuhan 430200,China [2]Institute of Optoelectronics and Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception,Fudan University,Shanghai 200433,China [3]State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material,China [4]School of Mathematical and Physical Sciences,Wuhan Textile University,Wuhan 430200,China

出　　处：《Journal of Materials Science & Technology》2024年第18期98-106,共9页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52301236);the Shanghai Pujiang Program(No.22PJ1401000).

摘　　要：Electromagnetic wave absorption materials featuring small thicknesses and wide effective absorption bandwidth(EAB)are highly required for next-generation portable devices,wearable electronics,and blooming military applications.However,traditional EM particle absorbents,such as carbon-based,mag-netic metal-based,and MXene-based materials are always visible black,which severely hinders their uti-lization as microwave-stealth smart window alternatives.Therefore,it is a critical challenge to fabricate flexible windows simultaneously possessing high optical transmittance and excellent EM wave absorption properties.Herein,we prepared a transparent wood composite with an optical transmittance value of more than-83%through a delignification and polymer composite immersion method.The delignification process could remove the light-absorbing lignin component,and the transparent woods were realized by immersing the delignified wood into refractive-index-matched pre-polymerized acrylamide(AM)in-cluding minor silver nanowires,carbon nanotubes,and reduced graphene oxides.In addition,due to the presence of numerous polarization centers originating from hydrophilic functional groups and conductive fillers,the transparent wood composite showed superior EM absorption performance,and EAB can reach 9.5 GHz,almost occupying the whole X band(8.2-12.4 GHz)and Ku band(12.4-18 GHz)at a thickness of 2.0 mm.Furthermore,the transparent wood presented a great insulative thermal performance with a low thermal conductivity of 0.45 W m^(−1)K^(−1)(half of common glass).The developed transparent wood com-posites offered significant potential as smart energy-efficient windows with the expectation to survive military equipment and alleviate EM pollution.

关 键 词：Electromagnetic wave absorption Dielectric loss Optical transmittance POLYACRYLAMIDE Wood composite 

分 类 号：TQ127.11[化学工程—无机化工]