PRES 33 |
| Diazonium salts are reported to selectively react with metallic single-walled carbon nanotubes (SWNTs) over semiconducting SWNTs. In this study, we investigated the reaction kinetics of SWNT mixtures with 4-hydroxybenzene diazonium salts under various experimental conditions and analyzed their influence on the reaction selectivity using UV-Vis-nIR absorption spectroscopy. Metallic SWNTs reacted preferentially with diazonium salts over semiconducting SWNTs at low salt concentrations with a maximum selectivity of 76%. However, the selectivity was drastically lowered at high salt concentrations, as the semiconducting SWNTs as well as metallic reacted with diazonium salts. Furthermore, this reaction was shown to be light-sensitive. Both the selectivity and activity were increased upon illumination, indicating that the type of diazonium intermediate affects the reaction kinetics. Reaction rate constants of individual (n,m) SWNTs were also calculated by deconvolution of the absorption spectra. |
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SWNTs From Synthesis to Application, From the Lab to the Fab: In Memory of Dr. Richard Smalley
4:30 PM-6:30 PM, Sunday, 10 September 2006 Moscone Center -- Room 305, Poster
Presidential Event |