Femtosecond pump-probe studies of reduced graphene oxide thin films

Ruzicka, Brian A.; Werake, Lalani K.; Hui Zhao; Shuai Wang; Kian Ping Loh
April 2010
Applied Physics Letters;4/26/2010, Vol. 96 Issue 17, p173106
Academic Journal
The dynamics of photocarriers in reduced graphene oxide thin films is studied by using ultrafast pump-probe spectroscopy. Time dependent differential transmissions are measured with sample temperatures ranging from 9 to 300 K. At each sample temperature and probe delay, the sign of the differential transmission remains positive. A fast energy relaxation of hot carriers is observed, and is found to be independent of sample temperature. Our experiments show that the carrier dynamics in reduced graphene oxide is similar to other types of graphene, and that the differential transmission is caused by phase-state filling effects of carriers.


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