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Ultrafast lattice dynamics of single crystal and polycrystalline gold nanofilms

Hu, Jianbo and Karam, Tony E. and Blake, Geoffrey A. and Zewail, Ahmed H. (2017) Ultrafast lattice dynamics of single crystal and polycrystalline gold nanofilms. Chemical Physics Letters, 683 . pp. 258-261. ISSN 0009-2614. https://resolver.caltech.edu/CaltechAUTHORS:20170424-081453643

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Abstract

Ultrafast electron diffraction is employed to spatiotemporally visualize the lattice dynamics of 11 nm-thick single-crystal and 2 nm-thick polycrystalline gold nanofilms. Surprisingly, the electron-phonon coupling rates derived from two temperature simulations of the data reveal a faster interaction between electrons and the lattice in the case of the single-crystal sample. We interpret this unexpected behavior as arising from quantum confinement of the electrons in the 2 nm-thick gold nanofilm, as supported by absorption spectra, an effect that counteracts the expected increase in the electron scattering off surfaces and grain boundaries in the polycrystalline materials.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://doi.org/10.1016/j.cplett.2017.04.021DOIArticle
http://www.sciencedirect.com/science/article/pii/S0009261417303433PublisherArticle
ORCID:
AuthorORCID
Karam, Tony E.0000-0002-1244-5141
Blake, Geoffrey A.0000-0003-0787-1610
Additional Information:© 2017 Elsevier B.V. Received 3 March 2017, Accepted 6 April 2017, Available online 8 April 2017. This work was supported by the National Science Foundation and the Air Force Office of Scientific Research (grant FA9550-16-1-0200) in the Physical Biology Center for Ultrafast Science and Technology at Caltech, funded by the Gordon and Betty Moore Foundation. The authors gratefully acknowledge the assistance of Dr. B. Chen and Dr. X. Fu for the TEM characterizations, and of Dr. G. Vanacore and Dr. J. Tang for helpful discussions. J.H. acknowledges the support from China 1000-Young Talents Plan.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
Air Force Office of Scientific Research (AFOSR)FA9550-16-1-0200
Gordon and Betty Moore FoundationUNSPECIFIED
China 1000-Young Talents PlanUNSPECIFIED
Subject Keywords:Ultrafast electron diffraction; Au nanofilms; Quantum confinement; Grain boundaries
Record Number:CaltechAUTHORS:20170424-081453643
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170424-081453643
Official Citation:Jianbo Hu, Tony E. Karam, Geoffrey A. Blake, Ahmed H. Zewail, Ultrafast lattice dynamics of single crystal and polycrystalline gold nanofilms, Chemical Physics Letters, Volume 683, 1 September 2017, Pages 258-261, ISSN 0009-2614, https://doi.org/10.1016/j.cplett.2017.04.021. (http://www.sciencedirect.com/science/article/pii/S0009261417303433)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76836
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Apr 2017 17:05
Last Modified:20 Apr 2020 08:47

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