Femtosecond pump-probe studies of reduced graphene oxide thin films

被引：147
|
作者：
Ruzicka, Brian A. [1 ]
Werake, Lalani K. [1 ]
Zhao, Hui [1 ]
Wang, Shuai [2 ]
Loh, Kian Ping [2 ]
机构：
[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
[2] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore
来源：
APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 17期
基金：
美国国家科学基金会;
关键词：
graphene; high-speed optical techniques; hot carriers; thin films; EPITAXIAL GRAPHENE;
D O I：
10.1063/1.3421541
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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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页数：3
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