Departmental Papers (MSE)

Document Type

Journal Article

Date of this Version

June 2005

Comments

Copyright American Physical Society. Reprinted from Physical Review B, Volume 71, Article 205423, 22 June 2005, 7 pages.
Publisher URL: http://link.aps.org/abstract/PRB/v71/e205423

Abstract

The electronic properties of p-doped single-walled carbon nanotube (SWNT) bulk samples were studied by temperature-dependent resistivity and thermopower, optical reflectivity and Raman spectroscopy. These all give consistent results for the Fermi level downshift (δ EF) induced by doping. We find δ EF ≈ 0.35 eV and 0.50 eV for concentrated nitric and sulfuric acid doping respectively. With these values, the evolution of Raman spectra can be explained by variations in the resonance condition as EF moves down into the valence band. Furthermore, we find no evidence for diameter-selective doping, nor any distinction between doping responses of metallic and semiconducting tubes.

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Date Posted: 27 June 2005

This document has been peer reviewed.