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Published July 23, 2012 | public
Journal Article

Ultrafast electron crystallography of heterogeneous structures: Gold-graphene bilayer and ligand-encapsulated nanogold on graphene


Here, we report studies of structures comprising a nanoscale gold-graphene bilayer and ligand-encapsulated nanogold on graphene multilayers. The observed time scale for the heating dynamics of the gold layer is significantly slower, when compared to previous results on free-standing gold films, and is independent of the level of carrier excitation. A model is proposed which incorporates the local carrier excitation in the gold layer, carrier relaxation in the graphene layer and heating of the gold layer by thermal conduction. When gold is isolated from graphene by ligand encapsulation, the carriers become again localized, consistent with the two phase description.

Additional Information

© 2012 Elsevier. Available online 15 June 2012. This work was supported by the National Science Foundation and the Air Force Office of Scientific Research in the Center for Physical Biology at Caltech supported by the Gordon and Betty Moore Foundation. We thank Oh-Hoon Kwon for his help in setting up the UEM experiment for the supported gold nanoparticles. We also thank the reviewer for the helpful comments.

Additional details

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