The Realistic Domain Structure of As-Synthesized Graphene Oxide from Ultrafast Spectroscopy

详细信息    查看全文

• 作者：Qun Zhang ; Hongjun Zheng ; Zhigang Geng ; Shenlong Jiang ; Jing Ge ; Kaili Fan ; Sai Duan ; Yang Chen ; Xiaoping Wang ; Yi Luo
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：August 21, 2013
• 年：2013
• 卷：135
• 期：33
• 页码：12468-12474
• 全文大小：411K
• 年卷期：v.135,no.33(August 21, 2013)
• ISSN：1520-5126

文摘

Graphene oxide (GO) is an attractive alternative for large-scale production of graphene, but its general structure is still under debate due to its complicated nonstoichiometric nature. Here we perform a set of femtosecond pump鈥損robe experiments on as-synthesized GO to extrapolate structural information in situ. Remarkably, it is observed that, in these highly oxidized GO samples, the ultrafast graphene-like dynamics intrinsic to pristine graphene is completely dominant over a wide energy region and can be modified by the localized impurity states and the electron鈥損honon coupling under certain conditions. These observations, combined with the X-ray photoelectron spectroscopy analysis and control experiments, lead to an important conclusion that GO consists of two types of domain, namely the carbon-rich graphene-like domain and the oxygen-rich domain. This study creates a new understanding of the realistic domain structure and properties of as-synthesized GO, offering useful guidance for future applications based on chemically modified/functionalized graphenes.