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Premature termination of growth, presumably because of catalyst deactivation, is an undesirableside effect of chemical vapor deposition of vertically aligned carbon nanotubes on predepositedmetal catalyst films. The addition of ferrocene, an effective precursor for in situ Fe formation, wasfound to enhance carbon nanotube growth rates and extend growth to 3.25 mm thick carbonnanotube films. Ferrocene was introduced into the gas stream by thermal evaporation concurrentlywith acetylene using a specially constructed source. The key factor facilitating the growth of thickcarbon nanotube films was the independent and precise control of the ferrocene amount in thefeedstock. The carbon nanotube films were characterized by scanning and transmission electronmicroscopy, and Raman spectroscopy. The temperature dependence of the carbon nanotube growthwith ferrocene exhibits a steep drop at high substrate temperatures and a loss of vertical alignmentat 900 °C. The negative temperature coefficient of the growth rate suggests that the reactionmechanism of vertically aligned carbon nanotube growth is governed by a heterogeneousintermediate step

applied physics letters

<i>In situ</i> control of the catalyst efficiency in chemical vapor deposition of vertically aligned carbon nanotubes on predeposited metal catalyst films

In situ control of the catalyst efficiency in chemical vapor deposition of vertically aligned carbon nanotubes on predeposited metal catalyst films