Nano Archive

Direct Generation of a Voltage and Current by Gas Flow Over Carbon Nanotubes and Semiconductors

Sood, A. K and Ghosh, Shankar (2004) Direct Generation of a Voltage and Current by Gas Flow Over Carbon Nanotubes and Semiconductors. Physical Review Letters, 93 (8). 086601-1-086601-4.

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Official URL: http://link.aps.org/doi/10.1103/PhysRevLett.93.086...

Abstract

We report here a direct generation of measurable voltages and currents when a gas flows over a variety of solids even at the modest speed of a few meters per second. The underlying mechanism is an interesting interplay of Bernoulli’s principle and the Seebeck effect: Pressure differences along streamlines give rise to temperature differences across the sample; these in turn produce the measured voltage. The electrical signal is quadratically dependent on the Mach number M and proportional to the Seebeck coefficient of the solids. Results are presented for doped Si and Ge , single wall and multiwall carbon nanotubes, and graphite. Our results show that gas flow sensors and energy conversion devices can be constructed based on direct generation of electrical signals.

Item Type:Article
Subjects:Physical Science > Nanophysics
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
ID Code:3853
Deposited By:JNCASR
Deposited On:27 Jan 2009 09:53
Last Modified:27 Jan 2009 09:53

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