Due to the limited electromagnetic wave(EMW)loss capacity and agglomeration,carbon black(CB)grad-ually fails to meet the increasingly harsh demanding conditions.Herein,defect-rich bamboo-like carbon nanotubes(CNTs)were grown on CB by the process of chemical vapor deposition.CNTs prepared in situ on CB can assist it to build a developed multilevel conductive network and introduce plentiful CB/CNTs nano-interfaces.What's more,the defects that accompany the growth of CNTs endow CNTs with a moder-ate conductivity and good impedance matching,thereby causing an effective microwave absorption(MA).Meanwhile,the high-density defects on CNTs can induce dipole polarization to further strengthen the EMW loss ability.The influence of CNTs with different growth time on MA performance has been ex-plored.Profiting from the structural merits,the synthesized CB-CNT with CNTs growth time of 40 min exhibits the optimal absorbing property,which has the minimum reflection loss of-53.6 dB and maxi-mum effective absorption bandwidth of 4.1 GHz with the thickness of 2.7 mm,covering almost the entire X band.The introduction of defect-rich CNTs significantly enhances the EMW loss ability of CB,which provides a rational strategy for the design of high-efficient microwave absorption materials.

Yameng Jiao;Qiang Song;Xuemin Yin;Liyuan Han;Wei Li;Hejun Li

State Key Laboratory of Solidification Processing,Shannxi Province Key Laboratory of Fiber Reinforced Light Composite Materials,Carbon/Carbon Composites Research Center,Northwestern Polytechnical University,Xi'an 710072,China

材料科学技术（英文版）

[1]Yameng Jiao;Qiang Song;Xuemin Yin;Liyuan Han;Wei Li;Hejun Li-.Grow defect-rich bamboo-like carbon nanotubes on carbon black for enhanced microwave absorption properties in X band)[J].材料科学技术（英文版）,2022(24):200-208

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