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Phys. Rev. Lett. 92, 075504 (2004) [4 pages]

Zipper Mechanism of Nanotube Fusion: Theory and Experiment

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Mina Yoon1, Seungwu Han2,*, Gunn Kim3, Sang Bong Lee3, Savas Berber1, Eiji Osawa4, Jisoon Ihm3, Mauricio Terrones5, Florian Banhart6, Jean-Christophe Charlier7, Nicole Grobert8, Humberto Terrones5, Pulickel M. Ajayan9, and David Tománek1,†
1Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA
2Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544, USA
3School of Physics, Seoul National University, Seoul 151-747, Korea
4NanoCarbon Research Institute Limited, Chosei-mura, Chosei-gun, Chiba 2994395, Japan
5Advanced Materials Department, IPICyT, Avenida Venustiano Carranza 2425-A, 78210 San Luis Potosí, SLP, México
6Institut für Physikalische Chemie, Universität Mainz, Welderweg 11, 55099 Mainz, Germany
7Université Catholique de Louvain, PCPM&CERMIN, B-1348 Louvain-la-Neuve, Belgium
8Max-Planck-Institut für Metallforschung, Heisenbergstrasse 3, D-70569 Stuttgart, Germany
9Department of Materials Science & Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA

Received 12 August 2003; published 19 February 2004

We propose a new microscopic mechanism to explain the unusually fast fusion process of carbon nanotubes. We identify the detailed pathway for two adjacent (5,5) nanotubes to gradually merge into a (10,10) tube, and characterize the transition states. The propagation of the fused region is energetically favorable and proceeds in a morphology reminiscent of a Y junction via a zipper mechanism, involving only Stone-Wales bond rearrangements with low activation barriers. The zipper mechanism of fusion is supported by a time series of high-resolution transmission electron microscopy observations.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.075504
DOI:
10.1103/PhysRevLett.92.075504
PACS:
61.46.+w, 64.70.Nd, 68.37.Lp, 81.07.De

*Permanent address: Department of Physics, Ewha Womans University, Seoul 120-750, Korea.

Author to whom correspondence should be addressed.

Electronic address: tomanek@pa.msu.edu