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We measured thermoelectric power S of bulk single-wall carbon nanotube (SWNT) materials p-doped with acids. In contrast to oxygen-exposed or degassed samples, S is very small at the lowest temperatures, increases super-linearly above a characteristic and sample-dependent T, and then levels off. We attribute this unusual behavior to 1-D phonon drag, in which the depression of the Fermi energy cuts off electron-phonon scattering at temperatures below a characteristic T0. This idea is supported by a model calculation in which the low temperature behavior of phonon drag is specifically related to the one-dimensional character of the electronic spectrum.
Vavro, J., Llaguno, M. C., Fischer, J. E., Ramesh, S., Saini, R. K., Ericson, L. M., Davis, V. A., Hauge, R. H., Pasquali, M., & Smalley, R. E. (2003). Thermoelectric Power of p-Doped Single-Wall Carbon Nanotubes and the Role of Phonon Drag. Retrieved from http://repository.upenn.edu/mse_papers/53
Date Posted: 02 February 2005
This document has been peer reviewed.