Photoluminescence from suspended individual $^{13}$C-enriched nanotubes

ORAL

Abstract

We investigate isotope effects on the electronic structure of single-walled carbon nanotubes by photoluminescence microscopy. In order to suspend nanotubes for luminescence measurements, trenches are formed on SiO$_2$/Si substrates by electron beam lithography and dry etching processes. No-flow chemical vapor deposition is used to grow carbon nanotubes with small amounts of isotopically enriched ethanol with 99\% $^{13}$C. Optical measurements are done in air at room temperature using a laser scanning confocal microscope with a wavelength tunable Ti:sapphire laser as an excitation source. We have successfully identified suspended $^{13}$C-enriched nanotubes by photoluminescence imaging and assigned their chirality with excitation spectroscopy.

*This work is supported by the Mitsubishi Foundation, Ogasawara Foundation, Ishikawa Carbon Foundation, KAKENHI, and Global COE Program of MEXT, Japan.

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Authors

  • T. Shimada

    • The University of Tokyo

  • A. Yokoyama

    • The University of Tokyo

  • A. Ishii

    • The University of Tokyo

  • Junichiro Shiomi

    • The University of Tokyo
    • Department of Mechanical Engineering, The University of Tokyo

  • Shigeo Maruyama

    • The University of Tokyo
    • Maruyama-Shiomi Lab, Department of Mechanical Engineering, The University of Tokyo
    • Department of Mechanical Engineering, The University of Tokyo

  • Y.K. Kato

    • The University of Tokyo