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4D electron diffraction reveals correlated unidirectional Behavior in zinc oxide nanowires

Yang, Ding-Shyue and Lao, Changshi and Zewail, Ahmed H. (2008) 4D electron diffraction reveals correlated unidirectional Behavior in zinc oxide nanowires. Science, 321 (5896). pp. 1660-1664. ISSN 0036-8075. https://resolver.caltech.edu/CaltechAUTHORS:YANsci08

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Abstract

The confined electronic structure of nanoscale materials has increasingly been shown to induce behavior quite distinct from that of bulk analogs. Direct atomic- scale visualization of nanowires of zinc oxide was achieved through their unique pancake- type diffraction by using four- dimensional (4D) ultrafast electron crystallography. After electronic excitation of this wide- gap photonic material, the wires were found to exhibit colossal expansions, two orders of magnitude higher than that expected at thermal equilibrium; the expansion is highly anisotropic, a quasi- one- dimensional behavior, and is facilitated by the induced antibonding character. By reducing the density of nanowires, the expansions reach even larger values and occur at shorter times, suggesting a decrease of the structural constraint in transient atomic motions. This unanticipated ultrafast carrier- driven expansion highlights the optoelectronic consequences of nanoscale morphologies.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.1162049DOIArticle
http://www.sciencemag.org/cgi/content/abstract/321/5896/1660PublisherArticle
http://www.sciencemag.org/cgi/content/full/321/5896/1660/DC1PublisherSupporting Material
Additional Information:© 2008 American Association for the Advancement of Science. 19 June 2008; accepted 13 August 2008. This work was supported by the NSF and the Air Force Office of Scientific Research in the Gordon and Betty Moore Center at Caltech. We wish to thank Z. L. Wang for providing the samples, which were made by P. Fei and S. Xu, and K. Xu for the help with the SEM measurement in J. R. Heath's laboratory at Caltech.
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:ZnO; crystallography; nanostructures; nanocrystals; microscopy; dynamics; growth; arrays; route
Issue or Number:5896
Record Number:CaltechAUTHORS:YANsci08
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:YANsci08
Official Citation:4D Electron Diffraction Reveals Correlated Unidirectional Behavior in Zinc Oxide Nanowires BY DING-SHYUE YANG, CHANGSHI LAO, AHMED H. ZEWAIL Science 19 Sep 2008: Vol. 321, Issue 5896, pp. 1660-1664 DOI: 10.1126/science.1162049
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13374
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Apr 2009 22:55
Last Modified:03 Oct 2019 00:36

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