A structure-reactivity relationship for single walled carbon nanotubes reacting with 4-hydroxybenzene diazonium salt

Research areas:
  • Uncategorized
Year: 2007
Type of Publication: Article
  • Nitish Nair, Monica L. Usrey Woo-Jae Kim
Journal: Journal of the American Chemical Society Volume: 129
Number: 13
Month: APR 4 2007
PT: J; TC: 51; UT: WOS:000245241600047
The first structure-reactivity relationship for electron-transfer reactions of single walled carbon nanotubes (SWNTs) has been derived and experimentally validated using 4-hydroxybenzene diazonium as a model electron acceptor. The model describes steady-state reaction data using an adsorption-controlled scheme, and electron transfer theories are used to explain the difference in reactivities between different nanotube chiralities. The formalism provides a mechanistic insight into electronically selective reactions. The influence of reagent concentration and external illumination (similar to 0.764 mW/cm(2)) on the reaction selectivity is described by the rate model, with quantitative descriptions of the changes in the UV-vis-nIR absorption spectra of nanotubes during reaction. Illumination was shown to decrease the selectivity of the reagent to metallic SWNTs over semiconducting SWNTs. We attribute this to the greater activity of the reagent in solution when exposed to light, resulting in greater extents of reaction for each SWNT and, hence, lower selectivity.