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APS » Journals » Phys. Rev. Lett. » Volume 104 » Issue 24
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Phys. Rev. Lett. 104, 247402 (2010) [4 pages]

Exciton Diffusion in Air-Suspended Single-Walled Carbon Nanotubes

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S. Moritsubo1, T. Murai1, T. Shimada1, Y. Murakami2, S. Chiashi3, S. Maruyama3, and Y. K. Kato1,4,*
1Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan
2Global Edge Institute, Tokyo Institute of Technology, Tokyo 152-8550, Japan
3Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
4PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan

Received 2 March 2010; published 15 June 2010

Direct measurements of the diffusion length of excitons in air-suspended single-walled carbon nanotubes are reported. Photoluminescence microscopy is used to identify individual nanotubes and to determine their lengths and chiral indices. Exciton diffusion length is obtained by comparing the dependence of photoluminescence intensity on the nanotube length to numerical solutions of diffusion equations. We find that the diffusion length in these clean, as-grown nanotubes is significantly longer than those reported for micelle-encapsulated nanotubes.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.104.247402
DOI:
10.1103/PhysRevLett.104.247402
PACS:
78.67.Ch, 71.35.-y, 78.55.-m

*Corresponding author.

ykato@sogo.t.u-tokyo.ac.jp

 
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