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...
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.
|Subjects:||Physical Science > Nanophysics|
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
|Deposited On:||27 Jan 2009 09:53|
|Last Modified:||27 Jan 2009 09:53|
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