Band Gap Fluorescence from Individual Single-Walled Carbon Nanotubes

American Association for the Advancement of Science (AAAS) - Tập 297 Số 5581 - Trang 593-596 - 2002
Michael O’Connell1, Sergei M. Bachilo1, Chad Huffman1, Valerie C. Moore1, Michael S. Strano1, Erik H. Hároz2, Kristy L. Rialon1, Peter J. Boul1, William H. Noon3, Carter Kittrell1, Jianpeng Ma3,4, Robert H. Hauge1, R. Bruce Weisman1, R. E. Smalley1,2
1Department of Chemistry, Rice Quantum Institute, and Center for Nanoscale Science and Technology,
2Department of Physics
3Department of Bioengineering, Rice University, 6100 Main Street, Houston, TX 77005, USA
4Graduate Program of Structural and Computational Biology and Molecular Biophysics, Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, One Baylor Plaza, BCM-125, Houston, TX 77030, USA.

Tóm tắt

Fluorescence has been observed directly across the band gap of semiconducting carbon nanotubes. We obtained individual nanotubes, each encased in a cylindrical micelle, by ultrasonically agitating an aqueous dispersion of raw single-walled carbon nanotubes in sodium dodecyl sulfate and then centrifuging to remove tube bundles, ropes, and residual catalyst. Aggregation of nanotubes into bundles otherwise quenches the fluorescence through interactions with metallic tubes and substantially broadens the absorption spectra. At pH less than 5, the absorption and emission spectra of individual nanotubes show evidence of band gap–selective protonation of the side walls of the tube. This protonation is readily reversed by treatment with base or ultraviolet light.

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Supported by the NSF Focused Research Group on Fullerene Nanotube Chemistry (DMR-0073046) the NSF Center for Biological and Environmental Nanotechnology (EEC-0118007) and the Robert A. Welch Foundation (C-0689). Support from NASA (NCC 9-77) for development of the HiPco method is also gratefully acknowledged. R.B.W. and S.M.B. are grateful to the NSF (grant CHE-9900417) and the Robert A. Welch Foundation (grant C-0807) for research support. We thank R. Saito for communicating unpublished computational results.

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American Association for the Advancement of Science (AAAS)

Tập 297 Số 5581

593-596

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