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Phys. Rev. B 70, 233408 (2004) [4 pages]

Photodesorption of oxygen from carbon nanotubes

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Yoshiyuki Miyamoto
Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, 305-8501, Japan

Noboru Jinbo* and Hisashi Nakamura
Research Organization for Information Science & Technology (RIST), 2-2-54, Nakameguro, Meguro, Tokyo, 153-0061, Japan

Angel Rubio
Departamento Fisica de Materiales, Facultad de Quimicas, Universidad del Páis Vasco, Centro Mixto CSIC-UPV/EHU and Donostia International Physics Center (DIPC), Apartado 1072, 20018 San Sebastian/Donostia, Spain

David Tománek
Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA

Received 11 October 2004; published 28 December 2004

We propose to use photodesorption as a noninvasive tool to clean carbon nanotubes from oxygen, offering a clear advantage over thermal and chemical treatments. The detachment of chemisorbed oxygen from atomic vacancies is triggered by a resonant Auger process, initiated by an O 1s→O 2p transition, which leaves two holes in the O 2s level. In the electronically excited state, oxygen desorbs spontaneously, with no damage to the carbon network or the cylindrical nanotube shape. Subsequent reaction of oxygen atoms with H2 molecules is shown to prevent reoxidation of the nanotube.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.233408
DOI:
10.1103/PhysRevB.70.233408
PACS:
81.07.De, 61.48.+c

*Present address: Advanced Systems Design and Engineering Dept., Isogo Nuclear Engineering Center, Toshiba Corp., 8 Shin-Sugita Cho, Isogo-Ku, Yokohama, 253-8523, Japan.

 
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