Title:	Flow-induced voltage and current generation in carbon nanotubes
Authors:	Ghosh, Shankar Sood, A.K. Ramaswamy, Sriram Kumar, N.
Issue Date:	22-Nov-2004
Publisher:	The American Physical Society
Citation:	Physical Review B, 2004, Vol.70, 205423
Abstract:	New experimental results, and a plausible theoretical understanding thereof, are presented for the flow-induced currents and voltages observed in single-walled carbon nanotube samples. In our experiments, the electrical response was found to be sublinear—nearly logarithmic—in the flow speed over a wide range, and its direction could be controlled by an electrochemical biasing of the nanotubes. These experimental findings are inconsistent with the conventional idea of a streaming potential as the efficient cause. Here we present Langevin-equation based treatment of the nanotube charge carriers, assumed to be moving in the fluctuating field of ions in the flowing liquid. The resulting "Doppler-shifted" force-force correlation, as seen by the charge carriers drifting in the nanotube, is shown to give a sublinear response, broadly in agreement with experiments.
URI:	http://hdl.handle.net/2289/1189
ISSN:	1098-0121 1550-235X (online)
Alternative Location:	http://link.aps.org/abstract/PRB/v70/e205423
Copyright:	(2004) by the American Physical Society
Appears in Collections:	Research Papers (TP)

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