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The temperature dependent thermoelectric power (TEP) of boron and nitrogendoped multi-walled carbon nanotube mats has been measured showing that suchdopants can be used to modify the majority conduction from p-type to n-type.The TEP of boron doped nanotubes is positive, indicating hole-like carriers. Incontrast, the nitrogen doped material exhibits negative TEP over the sametemperature range, suggesting electron-like conduction. Therefore, the TEPdistinct nonlinearites are primarily due to the formation of donor and acceptorstates in the B- and N- doped materials. The sharply varying density of statesused in our model can be directly correlated to the scanning tunnelingspectroscopy studies of these materials.Comment: 4 pages, 3 figures, revtex 4, submitted to PR

Nonlinear Behavior in the Thermopower of Doped Carbon Nanotubes Due to Strong, Localized States