Publication Date:
2002-07-27
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉O'Connell, Michael J -- Bachilo, Sergei M -- Huffman, Chad B -- Moore, Valerie C -- Strano, Michael S -- Haroz, Erik H -- Rialon, Kristy L -- Boul, Peter J -- Noon, William H -- Kittrell, Carter -- Ma, Jianpeng -- Hauge, Robert H -- Weisman, R Bruce -- Smalley, Richard E -- New York, N.Y. -- Science. 2002 Jul 26;297(5581):593-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Rice Quantum Institute, Rice University, 6100 Main Street, Houston, TX 77005, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12142535" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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