Carbon nanocages with N-doped carbon inner shell and Co/N-doped carbon outer shell as electromagnetic wave absorption materials

被引:476
作者
Liu, Panbo [1 ]
Gao, Sai [1 ]
Wang, Yang [1 ]
Huang, Ying [1 ]
He, Wenjuan [2 ]
Huang, Wenhuan [3 ]
Luo, Juhua [4 ]
机构
[1] Northwestern Polytech Univ, Sch Sci, Key Lab Mat Phys & Chem Extraordinary Condit, MOE, Xian 710129, Shaanxi, Peoples R China
[2] Northwestern Polytech Univ, Dept Pharm, Xian 710129, Shaanxi, Peoples R China
[3] Shaanxi Univ Sci & Technol, Coll Chem & Chem Engn, Shaanxi Key Lab Chem Addit Ind, Xian 710129, Shaanxi, Peoples R China
[4] Yancheng Inst Technol, Sch Mat Sci & Engn, Yancheng 224051, Peoples R China
基金
中国国家自然科学基金;
关键词
Metal-organic-frameworks; Carbon nanocages; Hollow structure; Co/N-doped carbon; Electromagnetic wave absorption; METAL-ORGANIC-FRAMEWORKS; MICROWAVE-ABSORPTION; PERFORMANCE; GRAPHENE; NANOCOMPOSITES; LIGHTWEIGHT; COMPOSITES; MICROSPHERES; CONSTRUCTION; 3D;
D O I
10.1016/j.cej.2019.122653
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Metal-organic-frameworks (MOFs)-derived carbon materials have been considered as promising candidates in electromagnetic wave absorption materials. However, precise design of MOFs-derived carbon materials with hollow structure still pose a formidable challenge. Herein, carbon nanocages have been synthesized by the direct pyrolysis of core-shell ZIF-8@ZIF-67 polyhedrons. Because of the different thermal stability of ZIF-8 core and ZIF-67 shell, the synthesized carbon nanocages are composed of N-doped carbon inner shell and Co/N-doped carbon outer shell. The micro-meso-macropores, enhanced conductive loss, strong dipolar/interfacial polarizations and core-shell Co@graphitic carbon layer favor the absorbers with high porosity, improved dielectric loss and promoted impedance matching. With a filler loading of 25 wt%, the maximum reflection loss reaches -52.5 dB at 13.1 GHz, and the effective absorption bandwidth exceeding -10 dB is 4.4 GHz (from 11.96 GHz to 15.36 GHz) with a thickness of only 2.2 mm. Furthermore, this work offers a simple and effective strategy in the fabrication of carbon nanocages with tuned chemical composition and improved impedance matching for lightweight and high-efficiency electromagnetic wave absorption materials.
引用
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页数:11
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