Microwave attenuation of multiwalled carbon nanotube-fused silica composites

Multiwalled carbon nanotubes (MWCNTs) were used to convert radome materials to microwave absorbing materials. Dense MWCNT-fused silica composites were prepared by hot-pressing technique. The composites exhibit high complex permittivities at X-band frequencies, depending on the content of MWCNTs. The...

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Bibliographic Details
Published inApplied physics letters Vol. 87; no. 12
Main Authors Xiang, Changshu, Pan, Yubai, Liu, Xuejian, Sun, Xingwei, Shi, Xiaomei, Guo, Jingkun
Format Journal Article
LanguageEnglish
Published United States 19.09.2005
Subjects
ABSORPTION
ATTENUATION
CARBON
COMPOSITE MATERIALS
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRONS
GHZ RANGE 01-100
GLASS
HOT PRESSING
MATERIALS SCIENCE
MICROWAVE RADIATION
NANOTUBES
PERMITTIVITY
SILICA
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Summary:Multiwalled carbon nanotubes (MWCNTs) were used to convert radome materials to microwave absorbing materials. Dense MWCNT-fused silica composites were prepared by hot-pressing technique. The composites exhibit high complex permittivities at X-band frequencies, depending on the content of MWCNTs. The value of the loss tangent increases three orders over pure fused silica only by incorporating 2.5vol% MWCNTs into the composites. The average magnitude of microwave transmission reaches −33dB at 11–12GHz in the 10vol% MWCNT-fused silica composites, which indicates the composites have excellent microwave attenuation properties. The attenuation properties mainly originate from the electric loss of MWCNTs by the motion of conducting electrons.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2051806