Diameter Control of Single-Wall Carbon Nanotubes by the Catalytic Chemical Vapor Deposition Method

Abstract

Single‐walled carbon nanotubes (SWNTs) have been synthesized by the pyrolysis of acetylene over well‐dispersed metal particles (cobalt and iron) embedded on catalyst supports such as commercially available zeolites and in‐house mesoporous silica at temperature above 800°C. Pristine specimens produced with different catalyst supports are characterized by transmission electron microscopy and Raman spectroscopy. It is found that some SWNTs in the pristine soot have a diameter distribution nearly equivalent to the surface pore size of the each catalyst supports.