Journal
CARBON
Volume 167, Issue -, Pages 843-851Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.05.072
Keywords
Selectively tailoring of covalence-bonds; Porous graphited carbon; Dielectric-translation behavior; Electromagnetic absorber
Funding
- National Natural Science Foundation of China [51602154]
- Fundamental Research Funds for the Center Universities [NE2018103]
- Aeronautical Science Foundation of China [2018ZF52071]
- Natural Science Foundation of Shandong Province [ZR2019YQ24]
- Qingchuang Talents Introduction Program of Shandong Higher Education institution (Research and Innovation Team of Structural-Functional Polymer Composites), China Postdoctoral Science Foundation [KLH2021060]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Recently, the exploration of a new strategy to create pores on carbon frameworks has received great interest. Herein, the selectively tailoring of the covalent bonding method has been shown to be one of the effective methods to generate pores based on graphitic hollow carbon frameworks (HGC). The mechanism of porous structure formation is due to directional clipping of sp(2) C-C and C=O covalent bonds into C-O bonds. Due to the effectively ability for selective tailoring of covalent bonds, the resulting porous HGC has dielectric transition behavior from conductive loss to dipole polarization dependent type, which is greatly beneficial to electromagnetic absorption. The results show that the porous HGC developed by this method has exceptionally EM absorption capacity, and the maximum qualified absorption bandwidth (f(E)) is 7.7 GHz at the thickness of 2.2 mm. Therefore, this work opens up a potential method for the design and synthesis of high-performance EM absorbers. (C) 2020 Elsevier Ltd. All rights reserved.
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