Industrial & Engineering Chemistry Research, Vol.53, No.22, 9088-9093, 2014
Role of Surfactant Adsorption in Controlling Morphology of Single-Walled Carbon Nanotubes/Polythiophene Nanohybrid
We have prepared nanohybrids of short single-walled carbon nanotubes (SWNTs) covered by a polythiophene (PT) layer. The SWNTs have an average length of 1 mu m and are well dispersed in water in the presence of sodium dodecyl benzene sulfonate (SDBS). The PT layer on the short SWNTs has been produced by catalytic oxidative polymerization in aqueous solution. It is found that the morphology of the PT layer is oriented by the morphology of the adsorbed SBDS on the SWNTs. It follows that, depending on the amount of SDBS added in the system, the PT on the SWNTs can be not only in the form of layer but also in the form of several spherical-like particles strung along each SWNT (i.e., in the beaded form). This result confirms the proposal (Vaisman et al. Adv. Colloid Interface Sci. 2006, 128-130, 37) that the SDBS adsorption on the SWNT sidewall is in the form of condensed assemblies. It is this condensed assembly that templates the beaded form of PT on the SWNTs.