Electronic friction and liquid-flow-induced voltage in nanotubes

Details Electronic friction and liquid-flow-induced voltage in nanotubes Electronic friction and liquid-flow-induced voltage in nanotubes

2004-07-12

arxiv.org/abs/cond-mat/0407291v1

Phys. Rev. B 69, 235410 (2004)

Physics

Condensed Matter

Materials Science

8 pages, 3 figures; published on PRB (http://link.aps.org/abstract/PRB/v69/e235410) and on the Virtual Journal of Nanoscale

Scientific paper

10.1103/PhysRevB.69.235410

A recent exciting experiment by Ghosh et al. reported that the flow of an ion-containing liquid such as water through bundles of single-walled carbon nanotubes induces a voltage in the nanotubes that grows logarithmically with the flow velocity v0. We propose an explanation for this observation. Assuming that the liquid molecules nearest the nanotube form a 2D solid-like monolayer pinned through the adsorbed ions to the nanotubes, the monolayer sliding will occur by elastic loading followed by local yield (stick-slip). The drifting adsorbed ions produce a voltage in the nanotube through electronic friction against free electrons inside the nanotube. Thermally excited jumps over force-biased barriers, well-known in stick-slip, can explain the logarithmic voltage growth with flow velocity. We estimate the short circuit current and the internal resistance of the nanotube voltage generator.

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