Volume 253, Issue 12 pp. 2446-2450
Original Paper

High-pressure optical study of small-diameter chirality-enriched single-wall carbon nanotubes

M. Krottenmüller

M. Krottenmüller

Experimentalphysik 2, Universität Augsburg, 86159 Augsburg, Germany

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W. Gao

W. Gao

Department of Electrical and Computer Engineering, Department of Physics and Astronomy, and Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, USA

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B. Anis

B. Anis

Spectroscopy Department, Physics Division, National Research Centre, 33 El Bohouth st. (former El Tahrir st.), P. O. 12622, Dokki, Giza, Egypt

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J. Kono

J. Kono

Department of Electrical and Computer Engineering, Department of Physics and Astronomy, and Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, USA

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C. A. Kuntscher

Corresponding Author

C. A. Kuntscher

Experimentalphysik 2, Universität Augsburg, 86159 Augsburg, Germany

Corresponding author: e-mail [email protected], Phone: +49-(0)821 598 3315, Fax: +49-(0)821 598 3411Search for more papers by this author
First published: 03 August 2016
Citations: 5

Abstract

We have investigated the mechanical stability of small-diameter single-wall carbon nanotube (SWCNT) films via optical absorption spectroscopy under high pressure. The studied sample was enriched in (6,5) SWCNTs, in order to observe sharp optical transitions even at high pressures. We observed two well-defined absorption bands in the studied frequency range, both of which red-shifted with increasing pressure. The rate of the pressure-induced red shift of one absorption band was found to change dramatically at 8 GPa, which we interpret as a structural phase transition of the nanotubes’ cross-section from circular to oval. By comparing the data with that for a film of mixed-chirality SWCNTs with an average diameter of 1.4 nm, we conclude that smaller-diameter SWCNTs have higher mechanical stability, which is consistent with theoretical expectations. No collapse of (6,5) SWCNTs was observed up to 22 GPa.

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