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Ultrafast carrier dynamics and saturable absorption of solution-processable few-layered graphene oxide

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7 Author(s)
Zhao, Xin ; Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Teda Applied Physics School, School of Physics, Nankai University, Tianjin 300457, People’s Republic of China ; Liu, Zhi-Bo ; Yan, Wei-Bo ; Wu, Yingpeng
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Ultrafast carrier dynamics and saturable absorption of few-layered graphene oxide, well-dispersed in organic solvent, are studied using femtosecond pump-probe and Z-scan techniques. The results demonstrate that few-layered graphene oxide has a fast energy relaxation of hot carriers and strong saturable absorption, which is comparable with that of reduced graphene oxide. Fast carrier relaxation combined with well solution processing capability arises from the large fraction of sp2 carbon atom inside the few-layered graphene oxide sheet together with oxidation mainly existing at the edge areas. This superiority of few-layered graphene oxide will facilitate potential applications of graphene for ultrafast photonics.

Published in:

Applied Physics Letters  (Volume:98 ,  Issue: 12 )

Date of Publication:

Mar 2011

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