Biomass-based aligned carbon networks with double-layer construction for tunable electromagnetic shielding with ultra-low reflectivity

作     者：Jiali Chen Da Yi Xichen Jia Guoqing Wang Zhouping Sun Lihua Zhang Yinfeng Liu Bin Shen Wenge Zheng Jiali Chen;Da Yi;Xichen Jia;Guoqing Wang;Zhouping Sun;Lihua Zhang;Yinfeng Liu;Bin Shen;Wenge Zheng

作者机构：School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Ningbo Key Lab of Polymer MaterialsNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Microelectronics and Communication EngineeringChongqing UniversityChongqing 400044China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第103卷第8期

页      面：98-104页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 080703[工学-动力机械及工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financial supports from Natural Science Foundation of Ningbo(202003N4026) S&T Innovation 2025 Major Special Programme of Ningbo(2018B10054) National Natural Science Foundation of China(62001065 and 51603218) 

主　　题：Aligned carbon networks Double-layer construction Tunable electromagnetic shielding Ultra-low reflectivity 

摘      要：Nowadays,carbon frameworks derived from natural biomaterials have attracted extensive attention for electromagnetic interference(EMI)shielding due to their renewability and ***,it is critical and challenging to achieve effective regulation of shielding effectiveness(SE)as well as weaken the strong EM reflection of highly conductive biomass-based carbon ***,commercial cotton pads with oriented structure were selected as carbonaceous precursor to fabricate aligned carbon networks by pyrolysis,and the EMI SE of the samples with increased temperature of 800-1000℃ can be accurately controlled in the effective range of~21.7-29.1,~27.7-37.1 and~32.7-43.3 d B with high reflection coefficient of0.8 by changing the cross-angle between the electric-field direction of incident EM waves and the fiber-orientation direction due to the occurrence of opposite internal electric ***,the further construction of Salisbury absorber-liked double-layer structure could result in an ultralow reflection coefficient of only~0.06 but enhanced SE variation range up to~38.7-49.3 d B during the adjustment of cross-angle,possibly due to the destructive interference of EM waves in the double-layer carbon *** work would provide a simple and effective way for constructing high-performance biomass carbon materials with adjustable EMI shielding and ultra-low reflectivity.