A Stable Electroactive Monolayer Composed of Soluble Single-Walled Carbon Nanotubes on ITO

作者：Wang Qiguan; Moriyama Hiroshi^*

来源：Bulletin of the Chemical Society of Japan, 2009, 82(6): 743-749.

DOI：10.1246/bcsj.82.743

Self-assembled monolayers (SAMS) of single-walled carbon nanotubes (SWNTs) covalently attached to a (3-aminopropyl)trimethoxysilane-modified ITO surface (SAM-ITO) were prepared by the coupling reaction of the amine groups with the carboxyl groups from the soluble SWNTs, which were safely obtained via a two-step process assisted by microwave irradiation. The surface composition of the SAM-ITO was examined using X-ray photoelectron spectroscopy. The cyclic voltammetry (CV) behavior of the SAM-ITO in all organic system showed a higher capacitor charging Current. which indicated the presence of a tethered SWNT monolayer. However, the CV behavior of the SAM-ITO in acidic aqueous Solutions showed unexpected oxidation signals because of redox reactions involving the defects and sidewalls of Soluble functionalized SWNTs. To make the CVs of the resulting SWNT monolayers more stable in acidic aqueous solutions, a conductive oligomer of tetramer aniline was additionally incorporated onto the residual carboxyl groups on the SWNTs. The UV-vis spectrum showed that the SWNT monolayer was successfully endcapped by the conductive oligomer and atomic force microscopy images showed that the SWNTs from the self-assembled monolayer were thickened and the SWNT Surfaces were roughened. The CV data showed a single reversible redox Couple, which indicated a more stable state.

• 出版日期2009-6-15