TY - JOUR
T1 - In-situ pyrolyzed polymethylsilsesquioxane multi-walled carbon nanotubes derived ceramic nanocomposites for electromagnetic wave absorption
AU - Chen, Lixin
AU - Zhao, Jia
AU - Wang, Lei
AU - Peng, Fei
AU - Liu, Hu
AU - Zhang, Jiaoxia
AU - Gu, Junwei
AU - Guo, Zhanhu
N1 - Publisher Copyright:
© 2019 Elsevier Ltd and Techna Group S.r.l.
PY - 2019/6/15
Y1 - 2019/6/15
N2 - Iron acetylacetonate (Fe(acac) 3 ) modified polymethylsilsesquioxane (PMS), simplified as PMS(Fe), was firstly obtained from PMS and Fe(acac) 3 via the condensation reaction. Multi-walled carbon nanotubes (MWCNTs) were then introduced to fabricate the corresponding MWCNTs/SiC nanocrystals/amorphous SiOC ceramic composites via pyrolyzed process. Owing to the catalytic effect of iron and heterogeneous nucleation promoted by MWCNTs, SiC nanocrystals were separated from SiOC amorphous ceramic matrix under 1400 °C. When the mass fraction of MWCNTs was 9 wt%, the obtained MWCNTs/SiC nanocrystals/amorphous SiOC ceramic composite (C9) demonstrated high microwave-absorbing properties. The minimum reflection loss (RL min ) and effective absorption bandwidth (EBA) of the obtained C9 at X-band (8.2–12.4) reached −61.8 dB and 2.6 GHz (a thickness of 2.19 mm), respectively. Compared with other polymer-derived ceramics (PDCs), the RL min was higher and the required thickness was thinner. This excellent microwave-absorbing property was due to the interfacial polarization relaxation generated between nanocrystals (MWCNTs & SiC) and amorphous SiOC, and the formed complete conductive networks inside the ceramic composites.
AB - Iron acetylacetonate (Fe(acac) 3 ) modified polymethylsilsesquioxane (PMS), simplified as PMS(Fe), was firstly obtained from PMS and Fe(acac) 3 via the condensation reaction. Multi-walled carbon nanotubes (MWCNTs) were then introduced to fabricate the corresponding MWCNTs/SiC nanocrystals/amorphous SiOC ceramic composites via pyrolyzed process. Owing to the catalytic effect of iron and heterogeneous nucleation promoted by MWCNTs, SiC nanocrystals were separated from SiOC amorphous ceramic matrix under 1400 °C. When the mass fraction of MWCNTs was 9 wt%, the obtained MWCNTs/SiC nanocrystals/amorphous SiOC ceramic composite (C9) demonstrated high microwave-absorbing properties. The minimum reflection loss (RL min ) and effective absorption bandwidth (EBA) of the obtained C9 at X-band (8.2–12.4) reached −61.8 dB and 2.6 GHz (a thickness of 2.19 mm), respectively. Compared with other polymer-derived ceramics (PDCs), the RL min was higher and the required thickness was thinner. This excellent microwave-absorbing property was due to the interfacial polarization relaxation generated between nanocrystals (MWCNTs & SiC) and amorphous SiOC, and the formed complete conductive networks inside the ceramic composites.
KW - Ceramic composites
KW - Microwave-absorbing property
KW - Multi-walled carbon nanotubes
KW - Polymer-derived ceramics
KW - SiC nanocrystals
UR - http://www.scopus.com/inward/record.url?scp=85062955126&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2019.03.052
DO - 10.1016/j.ceramint.2019.03.052
M3 - 文章
AN - SCOPUS:85062955126
SN - 0272-8842
VL - 45
SP - 11756
EP - 11764
JO - Ceramics International
JF - Ceramics International
IS - 9
ER -