Hierarchical, seamless, edge-rich nanocarbon hybrid foams for highly efficient electromagnetic-interference shielding
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第13期
论文作者：Liyuan Han Qiang Song Kezhi Li Xuemin Yin Jiajia Sun Hejun Li Fengpei Zhang Xinran Ren Xi Wang
摘 要：Lightweight,flexible,ultrahigh-performance electromagnetic-interfe rence（EMI） shielding materials are urgently required in the areas of aircraft/aerospace,portable and wearable electronics.Herein,1 D carbon nanotubes（CNT） and carbon nanofibers（CNF） with 2 D edge-rich graphene（ERG） are used to form a lightweight,flexible CNT-ERG-CNF hybrid foam.This foam was fabricated through a self-sacrificial templating chemical vapor deposition process,where nanocarbons bond through covalent bonding,forming a hierarchical 3 D hybridized carbon nanostructure.Multistage conductive networks and heterogeneous interfaces were constructed using edge-rich nanocarbons to increase the induced currents and interfacial polarization which makes great contributions to achieve high absorption electromagnetic shielding effectiveness（SEA）.The CNT-ERG-CNF hybrid foam exhibits EMI shielding effectiveness（SE） exceeding55.4 dB in the X-band while the specific SE（SSE,SE divided by mass density） achieves 9200 dB cm3 g-1,which surpasses that of nearly all other carbon-based composite materials.Furthermore,the structural stability and durability of the flexible CNT-ERG-CNF hybrid foams is examined by measuring EMI SE after 10000 times cyclic bending.Remarkably,this work not only provides a new idea for preparing hierarchical carbon materials for a wide range of applications,but presents some fundamental insights for achieving higher absorption losses in EMI shielding materials.
Liyuan Han，Qiang Song，Kezhi Li，Xuemin Yin，Jiajia Sun，Hejun Li，Fengpei Zhang，Xinran Ren，Xi Wang
State Key Laboratory of Solidification Processing, Shannxi Province Key Laboratory of Fiber Reinforced Light Composite Materials, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University
摘 要：Lightweight,flexible,ultrahigh-performance electromagnetic-interfe rence（EMI） shielding materials are urgently required in the areas of aircraft/aerospace,portable and wearable electronics.Herein,1 D carbon nanotubes（CNT） and carbon nanofibers（CNF） with 2 D edge-rich graphene（ERG） are used to form a lightweight,flexible CNT-ERG-CNF hybrid foam.This foam was fabricated through a self-sacrificial templating chemical vapor deposition process,where nanocarbons bond through covalent bonding,forming a hierarchical 3 D hybridized carbon nanostructure.Multistage conductive networks and heterogeneous interfaces were constructed using edge-rich nanocarbons to increase the induced currents and interfacial polarization which makes great contributions to achieve high absorption electromagnetic shielding effectiveness（SEA）.The CNT-ERG-CNF hybrid foam exhibits EMI shielding effectiveness（SE） exceeding55.4 dB in the X-band while the specific SE（SSE,SE divided by mass density） achieves 9200 dB cm3 g-1,which surpasses that of nearly all other carbon-based composite materials.Furthermore,the structural stability and durability of the flexible CNT-ERG-CNF hybrid foams is examined by measuring EMI SE after 10000 times cyclic bending.Remarkably,this work not only provides a new idea for preparing hierarchical carbon materials for a wide range of applications,but presents some fundamental insights for achieving higher absorption losses in EMI shielding materials.
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