Structural Engineering of Hierarchical Aerogels Comprised of Multi-dimensional Gradient Carbon Nanoa

• 作 者: Yongpeng Zhao Xueqing Zuo Yuan Guo Hui Huang Hao Zhang Ting Wang Ningxuan Wen Huan Chen Tianze Cong Javid Muhammad Xuan Yang Xinnan Wang Zeng Fan Lujun Pan
• 机 构: School of Physics,Dalian University of Technology,Dalian 116024,Liaoning,People’s Republic of China
• 出 处: 纳微快报（英文版）
• 发表日期: 2021年9期
• 关键词: Hierarchical aerogels Multi-dimensional gradient Carbon nanocoils Microwave abso

Recently,multilevel structural carbon aerogels are deemed as attractive candidates for microwave absorbing materials.Nevertheless,excessive stack and agglomeration for low-dimension carbon nanomaterials inducing impedance mismatch are significant challenges.Herein,the delicate “3D helix-2D sheet-lD fiber-0D dot” hierarchical aerogels have been successfully synthesized,for the first time,by sequential processes of hydrothermal self-assembly and in-situ chemical vapor deposition method.Particularly,the graphene sheets are uniformly intercalated by 3D helical carbon nanocoils,which give a feasible solution to the mentioned problem and endows the as-obtained aerogel with abundant porous structures and better die-lectric properties.Moreover,by adjusting the content of 0D core-shell structured particles and the parameters for growth of the 1D carbon nanofibers,tunable electromagnetic properties and excellent impedance matching are achieved,which plays a vital role in the microwave absorption performance.As expected,the optimized aerogels harvest excellent performance,including broad effective bandwidth and strong reflection loss at low filling ratio and thin thickness.This work gives valuable guidance and inspiration for the design of hierarchi-cal materials comprised of dimensional gradient structures,which holds great application potential for electromagnetic wave attenuation.