One-step and low-temperature synthesis of carbon nanotubes with no post treatment and high purity

Abstract

A new strategy for the synthesis of carbon nanotubes without any catalyst via the reaction between difluorocarbene (CF₂) radicals generated from a precursor (hexafluoropropylene oxide) and porous silicon nanowire arrays at low temperature is reported in this study. No further post treatment is needed and a high CNT purity of ∼90% is achieved. A four-step formation mechanism is proposed to understand the growth process of the carbon nanotubes.