Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 4, Issue 48, Pages 11419-11426Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc04048a
Keywords
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Funding
- National Natural Science Foundation of China [11575085]
- Aeronautics Sciences Foundation of China [2014ZF52072]
- Open Research Fund of Jiangsu Provincial Key Laboratory for Nanotechnology of Nanjing University
- Qing Lan Project
- six talent peaks project in Jiangsu Province [XCL-035]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Nanostructured carbon materials with hollow structures derived from metal organic frameworks (MOFs) have attracted considerable attention due to their low density for microwave absorption. However, their poor impedance matching worsens the absorption properties. The rational design and fabrication of complex hollow nanocarbon materials with excellent impedance matching still remains a challenge. Herein, we report a simple strategy to fabricate porous CuO/carbon composites by nitrate impregnation into a MOF template (thermal decomposition of zeolitic imidazolate frameworks, ZIF-67). When used as microwave absorbing materials, these hollow CuO/carbon composite polyhedra exhibited excellent impedance matching, light weight and strong absorption. An optimal reflection loss (RL) of -57.5 dB is achieved at 14.9 GHz with a matching thickness of 1.55 mm and RL values less than -10 dB can be gained in the range of 13-17.7 GHz. The best absorbing performance of the composites mainly originates from the high loss of the porous carbon obtained by the carbonization of ZIF-67, and the improvement of the impedance matching with the embedding of CuO. This work may provide a general way for fabricating porous metal oxides/carbon composites for lightweight microwave absorbing materials.
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