Park, Sang Tae and Flannigan, David J. and Zewail, Ahmed H. (2012) 4D Electron Microscopy Visualization of Anisotropic Atomic Motions in Carbon Nanotubes. Journal of the American Chemical Society, 134 (22). pp. 9146-9149. ISSN 0002-7863 http://resolver.caltech.edu/CaltechAUTHORS:20120711-124027960
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We report the anisotropic atomic expansion dynamics of multi-walled carbon nanotubes, using 4D electron microscopy. From time-resolved diffraction on the picosecond to millisecond scale, following ultrafast heating at the rate of 10^(13) K/s, it is shown that nanotubes expand only in the radial (intertubule) direction, whereas no significant change is observed in the intratubular axial or equatorial dimensions. The non-equilibrium heating occurs on an ultrafast time scale, indicating that the anisotropy is the result of an efficient electron−lattice coupling and is maintained up to equilibration. The recovery time, which measures the heat dissipation rate for equilibration, was found to be on the order of ∼100 μs. This recovery is reproduced theoretically by considering the composite specimen−substrate heat exchange.
|Additional Information:||© 2012 American Chemical Society. Received: April 26, 2012; Publication Date (Web): May 16, 2012. This work was supported by the National Science Foundation and the Air Force Office of Scientific Research in the Physical Biology Center for Ultrafast Science and Technology (UST) supported by the Gordon and Betty Moore Foundation at Caltech. The authors thank Dr. Anthony W. Fitzpatrick for carefully reading the manuscript. The authors declare no competing financial interest.|
|Official Citation:||4D Electron Microscopy Visualization of Anisotropic Atomic Motions in Carbon Nanotubes Sang Tae Park, David J. Flannigan, and Ahmed H. Zewail Journal of the American Chemical Society 2012 134 (22), 9146-9149|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Aucoeur Ngo|
|Deposited On:||11 Jul 2012 20:32|
|Last Modified:||11 Jul 2012 20:32|
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