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Journal Article

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

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Yu,  H. K.
Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society;

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Wodtke,  A. M.
Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society;

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Ropers,  Claus       
Department of Ultrafast Dynamics, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

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.


Cite as: https://hdl.handle.net/11858/00-001M-0000-001A-17A0-B
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.