Multiwalled carbon nanotube forest grown via chemical vapor deposition from iron catalyst nanoparticles by ToF-SIMS

Abstract

The authors report the time-of-flight secondary ion mass spectrometry of carbon nanotubes grown catalytically from iron nanoparticles. Both positive and negative ion spectra were obtained using a cluster ion source (Bi32+ primary ions at 50 keV). The positive mode contains an intense C+ signal. The Cn− peaks in the negative ion spectrum show an odd–even effect in their intensities.