The Realistic Domain Structure of As-Synthesized Graphene Oxide from Ultrafast Spectroscopy
2013 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 135, no 33, 12468-12474 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2013. Vol. 135, no 33, 12468-12474 p.
Analysis and controls, Chemically modified, Electron phonon couplings, Future applications, Large-scale production, Pump-probe experiments, Structural information, Ultra-fast spectroscopies
IdentifiersURN: urn:nbn:se:kth:diva-129118DOI: 10.1021/ja407110rISI: 000323536100048ScopusID: 2-s2.0-84883071800OAI: oai:DiVA.org:kth-129118DiVA: diva2:652211
QC 201309302013-09-302013-09-192013-09-30Bibliographically approved