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  Ultrafast low-energy electron diffraction in transmission resolves polymer/graphene superstructure dynamics.

Gulde, M., Schweda, S., Storeck, G., Maiti, M., Yu, H. K., Wodtke, A. M., et al. (2014). Ultrafast low-energy electron diffraction in transmission resolves polymer/graphene superstructure dynamics. Science, 345(6193), 200-204. doi:10.1126/science.1250658.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-17A0-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-CA84-E
Genre: Journal Article

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 Creators:
Gulde, M., Author
Schweda, S., Author
Storeck, G., Author
Maiti, M., Author
Yu, H. K.1, Author              
Wodtke, A. M.1, Author              
Schäfer, S., Author
Ropers, C., Author
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1Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society, ou_578600              

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 Abstract: Two-dimensional systems such as surfaces and molecular monolayers exhibit a multitude of intriguing phases and complex transitions. Ultrafast structural probing of such systems offers direct time-domain information on internal interactions and couplings to a substrate or bulk support. We have developed ultrafast low-energy electron diffraction and investigate in transmission the structural relaxation in a polymer/graphene bilayer system excited out of equilibrium. The laser-pump/electron-probe scheme resolves the ultrafast melting of a polymer superstructure consisting of folded-chain crystals registered to a free-standing graphene substrate. We extract the time scales of energy transfer across the bilayer interface, the loss of superstructure order, and the appearance of an amorphous phase with short-range correlations. The high surface sensitivity makes this experimental approach suitable for numerous problems in ultrafast surface science.

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Language(s): eng - English
 Dates: 2014-07-11
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1126/science.1250658
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Title: Science
Source Genre: Journal
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Pages: - Volume / Issue: 345 (6193) Sequence Number: - Start / End Page: 200 - 204 Identifier: -