Probing Magnetic Susceptibility Anisotropy of Large-Diameter Armchair Carbon Nanotubes via Magnetic Linear Dichroism Spectroscopy

ORAL

Abstract

We studied magnetic susceptibility anisotropy, via magnetic linear dichroism spectroscopy, of aqueous suspensions of single-walled carbon nanotubes in high magnetic fields up to 22T using a unique magnet system (Split-Florida Helix magnet). Specifically, we measured magnetic susceptibility anisotropies, $\Delta \chi$, of several armchair species ranging from (5,5)-(13,13) at room temperature over an excitation wavelength range of 400-900 nm. For large diameter armchairs such as (12,12) and (13,13), we have observed some of the strongest alignment in a static magnetic field due to their large diameters. Results will be discussed in comparison with detailed calculations involving the Aharonov-Bohm effect.

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Authors

  • Erik Haroz

    • Rice University
    • Rice University, Dept. of ECE

  • Junichiro Kono

    • Rice University
    • Rice University, Dept. of ECE

  • Thomas Searles

    • Morehouse Univ., Dept. of Physics

  • Xiaomin Tu

    • National Institute of Standards \& Technology, Polymer Division

  • Ming Zheng

    • NIST
    • National Institute of Standards \& Technology, Polymer Division

  • Jeffrey Fagan

    • National Institute of Standards \& Technology, Polymer Division

  • Stephen McGill

    • National High Magnetic Field Laboratory

  • Dmitry Smirnov

    • National High Magnetic Field Laboratory