Nano Archive

Carbon Nanotube Flow Sensors

Ghosh , Shankar and Sood, A. K. and Kumar, N (2003) Carbon Nanotube Flow Sensors. Science , 299 (5609). pp. 1042-1044.

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Official URL: http://www.sciencemag.org/cgi/content/abstract/299...

Abstract

We report that the flow of a liquid on single-walled carbon nanotube bundles induces a voltage in the sample along the direction of the flow. The voltage that was produced fit a logarithmic velocity dependence over nearly six decades of velocity. The magnitude of the voltage depended sensitively on the ionic conductivity and on the polar nature of the liquid. Our measurements suggest that the dominant mechanism responsible for this highly nonlinear response involves a direct forcing of the free charge carriers in the nanotubes by the fluctuating Coulombic field of the liquid flowing past the nanotubes. We propose an explanation based on pulsating asymmetric ratchets. Our work highlights the device potential for nanotubes as sensitive flow sensors and for energy conversion.

Item Type:Article
Subjects:Physical Science > Nanophysics
Divisions:Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3882
Deposited By:JNCASR
Deposited On:27 Jan 2009 09:34
Last Modified:08 May 2009 21:55

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