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High-Purity Diamagnetic Single-Wall Carbon Nanotube Buckypaper

Younghyun Kim,^† Omar N. Torrens,^‡ J. M. Kikkawa,^‡ Edy Abou-Hamad,^§ Christophe Goze-Bac,^§ and David E. Luzzi*^†

Department of Materials Science and Engineering and Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272, LCVN, Institut de Physique de Montpellier, CNRS Université Montpellier 2, 34090 Montpellier, France

Chem. Mater., 2007, 19 (12), pp 2982–2986

DOI: 10.1021/cm063006h

Publication Date (Web): May 16, 2007

Copyright © 2007 American Chemical Society

Abstract

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We describe a novel purification process for single-wall carbon nanotube (SWNT) materials that removes non-nanotube carbon and reduces ferromagnetic impurities to levels at which native SWNT magnetic properties predominate. Ferromagnetism is reduced from 1.04 to less than 0.013 emu/g by magnetic gradient filtration. This procedure creates samples of sufficient quality for spectroscopies such as nuclear magnetic resonance (NMR). The overall cleanliness and purity of the material is confirmed through NIR absorption spectroscopy, X-ray diffraction, C₆₀ filling experiments with yields exceeding 90%, and high-resolution ¹³C NMR.

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History

Published In Issue June 12, 2007
Received December 18, 2006
Revised Manuscript Received March 1, 2007

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