Attachment of Metal Oxide Nanoparticles on Carbon Nanotubes with Different Oxidation Levels
An efficient surface modification technique for fabricating tin dioxide/carbon composite nanotubes has been developed. This technique combines with implantation of acidic groups, interaction between surface oxides and metal ions or hydration molecules, and thermal. To functionalize multi-layered carbon nanotubes (CNTs), gaseous oxidation at 300°C was used to build functional oxygen groups including carboxyl, carbonyl and hydroxyl group, on ends or sidewalls of CNTs. X-ray photoelectron spectroscopy clearly indicated that the atomic ratio of attached tin-oxide on the oxidized CNTs gradually increases with the oxidation level, i.e., surface O/C atomic ratio. This evidence reflected that the surface oxides act as an adsorption center that strongly interacts with metal ions or hydration molecules in aqueous phase.
C. T. Hsieh and J.Y. Lin, "Attachment of Metal Oxide Nanoparticles on Carbon Nanotubes with Different Oxidation Levels", Advanced Materials Research, Vols. 55-57, pp. 545-548, 2008