Femtosecond Photoexcited Carrier Dynamics in Reduced Graphene Oxide Suspensions and Films

Details Femtosecond Photoexcited Carrier Dynamics in Reduced Graphene Oxide Suspensions and Films Femtosecond Photoexcited Carrier Dynamics in Reduced Graphene Oxide Suspensions and Films

2010-05-08

arxiv.org/abs/1005.1322v2

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, to appear in International Journal of Nanoscience (IJN), 2011

Scientific paper

10.1142/S0219581X11008836

We report ultrafast response of femtosecond photoexcited carriers in single layer reduced graphene oxide flakes suspended in water as well as few layer thick film deposited on indium tin oxide coated glass plate using pump-probe differential transmission spectroscopy at 790 nm. The carrier relaxation dynamics has three components: ~200 fs, 1 to 2 ps, and ~25 ps, all of them independent of pump fluence. It is seen that the second component (1 to 2 ps) assigned to the lifetime of hot optical phonons is larger for graphene in suspensions whereas other two time constants are the same for both the suspension and the film. The value of third order nonlinear susceptibility estimated from the pump-probe experiments is compared with that obtained from the open aperture Z-scan results for the suspension.

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