期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 135, 期 33, 页码 12468-12474出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja407110r
关键词
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资金
- NBRPC [2010CB923300]
- NSFC [21173205, 91127042, 20925311]
- CAS [XDB01020000, KJCX2-EW-W09]
- FRFCUC [WK2340000012]
- USTC-NSRL [KY2340000021]
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 femto-second pump-probe 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-phonon 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.
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