TY - JOUR
T1 - Multiwalled carbon nanotubes-BaTiO3/silica composites with high complex permittivity and improved electromagnetic interference shielding at elevated temperature
AU - Qing, Yuchang
AU - Mu, Yang
AU - Zhou, Yingying
AU - Luo, Fa
AU - Zhu, Dongmei
AU - Zhou, Wancheng
PY - 2014/9
Y1 - 2014/9
N2 - 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 20dB at 25°C and 50dB at 600°C in the whole frequency range of 12.4-18GHz with a 1.5mm 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.
AB - 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 20dB at 25°C and 50dB at 600°C in the whole frequency range of 12.4-18GHz with a 1.5mm 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.
KW - Complex permittivity
KW - Electromagnetic interference
KW - Functional composites
KW - High-temperature properties
KW - Multiwalled carbon nanotubes
UR - http://www.scopus.com/inward/record.url?scp=84899051470&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2014.02.007
DO - 10.1016/j.jeurceramsoc.2014.02.007
M3 - 文章
AN - SCOPUS:84899051470
SN - 0955-2219
VL - 34
SP - 2229
EP - 2237
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 10
ER -