Flow-induced voltage and current generation in carbon nanotubes

Ghosh, S. ; Sood, A. K. ; Ramaswamy, S. ; Kumar, N. (2004) Flow-induced voltage and current generation in carbon nanotubes Physical Review B, 70 (20). 205423_1-205423_5. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v70/i20/e205423

Related URL: http://dx.doi.org/10.1103/PhysRevB.70.205423


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.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:18315
Deposited On:17 Nov 2010 12:48
Last Modified:17 May 2016 03:02

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