2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Synthesis of Oriented Carbon Nanotubes by Chemical Vapor Deposition

S.M. Mominuzzaman, I. Khatri, T. Soga and T. Jimbo
Nagoya Institute of Technology, JP

nanotube, pyrolysis, ethanol, ferrocene, oriented

In the present work we have synthesized low density aligned carbon nanotubes using ethanol as a precursor and ferrocene as a catalyst by simple thermal chemical vapour deposition (CVD) method on silicon substrates. The synthesis involves the pyrolysis of ethanol/ ferrocene solutions. Mist of the hydrocarbon/catalyst is produced by medical nebulizer and nitrogen gas is used as the carrier to the large size (75mm diameter and 1metre long) tube which is designed to produce nanotubes in large quantity once growth process is optimized for particular application. The growth temperature of the chamber is varied in wide range. The tubes are observed to be temperature dependent. Different types (in terms of size and shape) of nanotubes are grown at 800C. Short and closely uniform sized nanotubes are formed at 850C. Furthermore, very interestingly we obtained low density vertical aligned nanotubes in the edge of the substrates which has potential application in various electronic devices such as, field emitter at 850C. Our effort to reproduce the straight uniformed nanotube along with the low density vertically aligned nanotubes in the edge was successful and similar results are not reported so far by earlier observations in spray pyrolysis methods. Long nanotubes of different length and diameters are observed at 900C. Raman spectral analyses and TEM investigations of these nanotubes also will be reported for the first time.

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