期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 34, 期 10, 页码 2229-2237出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2014.02.007
关键词
Functional composites; High-temperature properties; Complex permittivity; Multiwalled carbon nanotubes; Electromagnetic interference
资金
- National Natural Science Foundation of China [51072165]
- Postdoctoral Science Foundation of China [2012M521800, 2013T60888]
Composites with silica matrix and mixed filler of multiwalled carbon nanotubes (MWCNTs) and BaTiO3 powder were fabricated. Excellent uniform dispersion of MWCNTs can be obtained using a two-step mixing method. Both of the real and imaginary parts of complex permittivity increased with increasing MWCNT content and measured temperature. The electromagnetic interference (EMI) shielding results showed that the absorption mechanism is the main contribution to the total EMI shielding effectiveness (SE). Compared with the EMI SE resulting from reflection, the absorption showed more dependence on the MWCNT content, measured temperature and frequency. The total EMI SE is greater than 20 dB at 25 degrees C and 50 dB at 600 degrees C in the whole frequency range of 12.4-18 GHz with a 1.5 nun composite thickness, which suggests that the MWCNT BaTiO3/silica composites could be good candidates for the EMI shielding materials in the measured frequency and temperature region. (C) 2014 Elsevier Ltd. All rights reserved.
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