Journal
NANOSCALE RESEARCH LETTERS
Volume 7, Issue -, Pages 1-7Publisher
SPRINGEROPEN
DOI: 10.1186/1556-276X-7-238
Keywords
Microwave absorption properties; Magnetic nanocapsules; Complex permittivity; Electric dipole model
Funding
- National Natural Science Foundation of China [51171185]
- National Basic Research Program of China of China [2012CB933103]
- Ministry of Science and Technology China
- IMR SYNL-T.S. Ke Research Grant
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The microwave absorption properties of Ni/(C, silicides) nanocapsules prepared by an arc discharge method have been studied. The composition and the microstructure of the Ni/(C, silicides) nanocapsules were determined by means of X-ray diffraction, X-ray photoelectric spectroscopy, and transmission electron microscope observations. Silicides, in the forms of SiOx and SiC, mainly exist in the shells of the nanocapsules and result in a large amount of defects at the 'core/shell' interfaces as well as in the shells. The complex permittivity and microwave absorption properties of the Ni/(C, silicides) nanocapsules are improved by the doped silicides. Compared with those of Ni/C nanocapsules, the positions of maximum absorption peaks of the Ni/(C, silicides) nanocapsules exhibit large red shifts. An electric dipole model is proposed to explain this red shift phenomenon.
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