Electrical and Raman Spectroscopic Studies of Vertically Aligned Multi-Walled Carbon Nanotubes

A Mathur, M Tweedie, SS Roy, PD Maguire, JAD McLaughlin

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19 Citations (Scopus)

Abstract

Microwave plasma enhanced chemical vapour deposition (MPECVD) was used for the production of carbon nanotubes. Vertically aligned multi-walled carbon nanotubes (MWCNTs) were grown on silicon substrates coated with cobalt thin films of thickness ranging from 0.5 nm to 3 nm. Prior to the nanotube growth the catalyst were treated with N-2 plasma for 5-10 minutes that break the films into small nanoparticles which favour the growth of nanotubes. The CNTs were grown at a substrate temperature of 700 degrees C for 5, 10 and 15 minutes. The height of the CNT films ranging from 10 mu m-30 mu m indicating that the initial growth rate of the CNTs are very high at a rate of approximately 100 nm/sec. Electrical resistivity of the above samples was evaluated from I-V measurements. The activation energy (E-a) was also calculated from the temperature dependent studies and it was found that the E-a lies in the range of 15-35 meV. Raman spectroscopy was used to identify the quality of the nanotubes.
Original languageEnglish
Pages (from-to)4392-4396
JournalJournal of Nanoscience and Nanotechnology
Volume9
Issue number7, Sp.
DOIs
Publication statusPublished - Jul 2009

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Keywords

  • Carbon Nanotubes
  • Electrical Properties
  • Raman Spectroscopy

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