Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 18, Issue 44, Pages 30507-30514Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp05099a
Keywords
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Funding
- National Natural Science Foundation of China [U1560106]
- Baosteel Group Corporation [U1560106]
- Aeronautical Science Foundation of China [2014ZF51069]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry)
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25 nm carbon-coated microporous Co/CoO nanoparticles (NPs) were synthesized by integrating chemical de-alloying and chemical vapor deposition (CVD) methods. The NPs possess micropores of 0.8-1.5 nm and display a homogeneous carbon shell of about 4 nm in thickness with a low graphitization degree. The saturation magnetization (MS) and coercivity (HC) of the NPs were 70.3 emu g(-1) and 398.4 Oe, respectively. The microporous Co/CoO/C NPs exhibited enhanced microwave absorption performance with a minimum reflection coefficient (RC) of -78.4 dB and a wide absorption bandwidth of 8.1 GHz (RC <= -10 dB), larger than those of the nonporous counterparts of -68.3 dB and 5.8 GHz. The minimum RC values of the microporous Co/CoO/C NPs at different thicknesses were much smaller than the nonporous counterparts. The high microwave absorption mechanism of the microporous Co/CoO/C nanocomposite can be interpreted in terms of the interfacial polarization relaxation of the core/shell and micropore structures, the effective permittivity modification of the air in the micropores and the polarization relaxation of the defects in the low-graphitization carbon shell and the porous Co NPs. Our study demonstrates that the microporous Co/CoO/C nanocomposite is an efficient microwave absorber with high absorption intensity and wide absorption bandwidth.
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