The role of Br in the selective synthesis of thin-walled carbon-nanotubes with micrometre-length Fe3C-filling, Fe3C tip-filled carbon nanotubes or empty carbon nanotubes by pyrolysis of ferrocene and (6-bromohexyl)ferrocene mixtures

Abstract

We report an advanced chemical vapour deposition method which allows the synthesis-selection of thin walled carbon nanotubes filled with micrometre-length Fe₃C single crystals, Fe₃C tip-filled nanotubes or of empty thin walled carbon nanotubes by controlled addition of a not previously used precursor (6-bromohexyl)ferrocene to ferrocene.