Synthesis of high quality single-walled carbon nanotubes via a catalytic layer reinforced by self-assembled monolayers

This work reports the synthesis of high quality single-walled carbon nanotubes (SWCN (T) under bar) using a catalytic layer reinforced by self-assembled monolayers (SA (M) under bar). Amine-SAMwas introduced on a SiO2/Si substrate and then an iron nanoparticles solution was dropped on the substrate by spin-coating. This catalytic template was used to grow carbon nanotubes by chemical vapor deposition and the synthesized SWCNT were observed to be prominent, based on the size distribution. Highly dense SWCNT with a diameter of about 1.1-1.2 nm were produced at 800-850 degrees C. Moreover, the diameter distribution of the SWCNT was more selective at a growth temperature of 900 degrees C. These findings provide important insights for a SAM support layer that can play the role as a restriction for the agglomeration of iron catalyst and is promising for the synthesis of high quality SWCNT. (C) 2013 Elsevier B. V. All rights reserved.