کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1473805 | 991061 | 2014 | 9 صفحه PDF | دانلود رایگان |
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 °C and 50 dB at 600 °C in the whole frequency range of 12.4–18 GHz with a 1.5 mm 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.
Journal: Journal of the European Ceramic Society - Volume 34, Issue 10, September 2014, Pages 2229–2237