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4D Electron Microscopy Visualization of Anisotropic Atomic Motions in Carbon Nanotubes

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. doi:10.1021/ja304042r. https://resolver.caltech.edu/CaltechAUTHORS:20120711-124027960

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Abstract

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.


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http://dx.doi.org/10.1021/ja304042rDOIUNSPECIFIED
http://pubs.acs.org/doi/abs/10.1021/ja304042rPublisherUNSPECIFIED
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.
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Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:22
DOI:10.1021/ja304042r
Record Number:CaltechAUTHORS:20120711-124027960
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120711-124027960
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.
ID Code:32355
Collection:CaltechAUTHORS
Deposited By: Aucoeur Ngo
Deposited On:11 Jul 2012 20:32
Last Modified:09 Nov 2021 21:26

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