The conductive polymer composites(CPCs)with highly efficient electromagnetic interference(EMI)shielding effectiveness(SE)are always accompanied with excessive reflectivity,which would cause se-rious secondary EMI pollution.In this regard,the significant reduction of EMI reflection of CPCs to allevi-ate secondary pollution is deemed to be very important.Herein,a promising cyanate ester(CE)based composite was successfully fabricated by compounding carbonized spent coffee grounds(C-SCG)and graphene nanosheets(GNSs)via a facile solution blending followed by a hot-pressing method.Benefit-ing from the porous structure of C-SCG and the layered structure of GNSs,a three-dimensional(3D)multi-interface conductive network in the CE was easily constructed.The EMI SE of the resultant 9 wt％C-SCG/CE composite(C9)is 15.38 dB and dramatically enhanced to 31.09 dB with the presence of 3 wt％GNSs.The remarkable enhancement is mainly attributed to the formation of the efficient conductive pathways as well as the well-dispersion of the incorporated fillers.Meanwhile,the absorption-dominated shielding mechanism in the prepared composites gets benefit from the synergistic effect of porous C-SCG and lamellar GNSs,which effectively captures and attenuates electromagnetic waves.These encouraging findings extend the practical applications of porous biocarbon materials in EMI shielding field.

Zhengzheng Guo;Penggang Ren;Zengping Zhang;Zhong Dai;Zhenxia Lu;Yanling Jin;Fang Ren

School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China;The Faculty of Printing,Packaging Engineering and Digital Media Technology,Xi'an University of Technology,Xi'an 710048,China;Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an 710064,China

材料科学技术（英文版）

[1]Zhengzheng Guo;Penggang Ren;Zengping Zhang;Zhong Dai;Zhenxia Lu;Yanling Jin;Fang Ren-.Fabrication of carbonized spent coffee grounds/graphene nanoplates/cyanate ester composites for superior and highly absorbed electromagnetic interference shielding performance)[J].材料科学技术（英文版）,2022(07):123-131

biocarbon

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