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Impact of oxide substrate on electrical and optical properties of carbon nanotube devices

Yu-Ming Lin, James C Tsang, Marcus Freitag and Phaedon Avouris

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We have studied suspended nanotube devices to investigate directly the impact of oxide substrate on the properties of nanotubes. The 1/f noise amplitude is reduced by about one order of magnitude when the nanotube is suspended, suggesting that the 1/f noise is dominated by the trapped charges in the oxide. We have also utilized the enhanced Raman signal intensity in suspended nanotubes to correlate electrical transport properties with Raman spectroscopy on the same individual nanotube, yielding close agreement in the tube diameter determined from both types of experiments.


PACS

85.35.Kt Nanotube devices

78.67.Ch Nanotubes

Subjects

Electronics and devices

Nanoscale science and low-D systems

Dates

Issue 29 (25 July 2007)

Received 17 April 2007, in final form 25 May 2007

Published 20 June 2007



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