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Ordered Mesoporous Carbon/Fused Silica Composites
Author(s) -
Wang Jiacheng,
Xiang Changshu,
Liu Qian,
Pan Yubai,
Guo Jingkun
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200701406
Subject(s) - materials science , composite material , electromagnetic shielding , composite number , percolation threshold , microwave , reflection loss , electrical conductor , carbon nanotube , carbon fibers , mesoporous silica , percolation (cognitive psychology) , emi , electromagnetic interference , electrical resistivity and conductivity , mesoporous material , catalysis , physics , engineering , quantum mechanics , neuroscience , electrical engineering , biology , telecommunications , computer science , chemistry , biochemistry
Abstract A series of novel, dense, and interesting ordered mesoporous carbon (OMC)/fused silica composites with different carbon contents has been prepared by a controllable but simple sol‐gel method followed by hot‐pressing. In the as‐sintered OMC/fused silica composites the carbon particles still exist in the form of perfectly ordered carbon nanowires. Conductivity measurements on the composites indicate that these novel composites are electrically conductive and have a typical percolation threshold of 3.5–5 vol% OMC. The electromagnetic interference (EMI) shielding efficiency (SE) of an OMC/fused silica composite containing 10 vol% OMC is as high as 40 dB in the X band which is higher than that of a carbon nanotube (CNT)/ fused silica composite with the same carbon content (∼30 dB). This indicates that these conductive OMC/fused silica composites are very suitable for an application as EMI shielding materials. Upon increasing the volume content of OMC in the composite the overall contribution as well as the increase rate of the microwave absorption are larger than those of the microwave reflection, which suggest that OMC/fused silica composites may also be promising electromagnetic (EM) wave absorbing materials. Based on the promising properties of these composites this work will hopefully lead to the development of new low‐cost and highly efficient EMI shielding or EM wave absorbing materials.