Sood, AK and Ghosh, Shankar (2004) Direct Generation of voltageand current by gas flow over Carbon nanotubes and semiconductors. In: Physical Review Letters, 93 (8). 086601/1-12.
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 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:||Journal Article|
|Additional Information:||Copyright for this article belongs to American Physical Society (APS).|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||10 Dec 2004|
|Last Modified:||19 Sep 2010 04:17|
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