Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 19, Issue 22, Pages 3725-3731Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b821386k
Keywords
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Funding
- Ministry of Science and Technology of China [2009CB930802]
- Chinese Academy of Sciences [KJCX2.YW.H16]
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Herein we present a simple method to coat a porous SiO2 layer on carbon nanotubes (CNTs) with the aid of the cationic surfactant cetyltrimethyl ammonium bromide (CTAB). The coating process was studied systematically, and a possible coating mechanism was proposed. Temperature and the ratio of CTAB/CNTs/H2O were found to play key role in the coating process. This method can be applied to both multiwalled carbon nanotubes (MWNTs) and single walled carbon nanotubes (SWNTs). The individualized nature of the CNTs (both MWNTs and SWNTs) was maintained during the coating process. Furthermore, Raman spectroscopy showed that this method is nondestructive to the electronic structure of CNTs. The CNT/porous SiO2 core/shell structure will serve as a platform for further surface functionalization of CNTs.
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