Optical studies of finite length effects in short DNA-wrapped carbon nanotubes

ORAL

Abstract

In this study, a systematic resonance Raman study was carried out on samples of DNA-wrapped SWNTs with average lengths between 50 and 100nm using multiple laser excitation energies. The different Raman features have been studied in detail as a function of nanotube length and laser excitation energies. The ratio of the D-band to G-band intensities has been found to increase with decreasing average SWNT length and decreasing laser excitation energy. As the nanotubes becomes much shorter than 1/4 wavelength of light, distinct finite length effects are also observed in overtone and intermediate frequency modes between 400 and 1500cm$^{-1}$. The MIT authors acknowledge supports under the Dupont-MIT Alliance, and NSF Grant DMR 04-05538.

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Authors

  • Grace Chou

    • Chemistry, MIT

  • Hyungbin Son

    • EECS, MIT
    • Department of Electrical Engineering and Computer Science, MIT, Cambridge, MA

  • Eduardo Barros

    • EECS/Physics, UFC, Brazil/MIT

  • Georgii G. Samsonidze

    • EECS, MIT

  • Ming Zheng

    • Experimental Station, Dupont Central Research and Development

  • Riichiro Saito

    • Tohoku University - Japan
    • Tohoku Un., Japan
    • Department of Physics, Tohoku University and CREST JST, Japan
    • Tohoku University
    • Tohoku University, Japan

  • Gene Dresselhaus

    • Francis Bitter Magnet Laboratory, MIT
    • MIT, USA

  • Mildred S. Dresselhaus

    • MIT - USA
    • Massachusetts Institute of Technology
    • MIT, USA
    • EECS/Physics, MIT
    • MIT