Systematic evaluation of different types of graphene oxide in respect to variations in their in-plane modulus
Journal article, 2017
Graphene oxide samples prepared in various laboratories following a diversity of synthesis protocols based on Brodie's (BGO) and Hummers/Offeman's (HGO) methods were compared in respect of their in-plane moduli. A simple wrinkling method allowed for a spatial resolution <1.5 ?m by converting the wrinkling frequency. Quite surprisingly, a drastic variation of the in-plane moduli was found spanning the range from 600 GPa for the best BGO types, which is in the region of chemically derived graphene, all the way down to less than 200 GPa for HGO types. This would suggest that there are no two equal GO samples and GO should not be regarded a compound but rather a class of materials with very variable physical properties. While large differences between Brodie's and Hummers/Offeman's types might have been expected, even within the group of Hummers/Offeman's types pronounced differences are observed that, based on 13C solid-state NMR, were related to over-functionalization versus over-oxidation.
Author
Patrick Feicht
Universitat Bayreuth
Renée Siegel
Universitat Bayreuth
Herbert Thurn
Universitat Bayreuth
Jens W. Neubauer
Leibniz-Institut fur Polymerforschung Dresden e.V.
Maximilian Seuss
Leibniz-Institut fur Polymerforschung Dresden e.V.
Tamás Szabó
Szegedi Tudomanyegyetem
Alexandr V. Talyzin
Umea universitet
C. E. Halbig
Lehrstuhl für Organische Chemie II
Siegfried Eigler
Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry
Daniel A. Kunz
Universitat Bayreuth
Andreas Fery
Technische Universitat Dresden
Leibniz-Institut fur Polymerforschung Dresden e.V.
Georg Papastavrou
Universitat Bayreuth
Jürgen Senker
Universitat Bayreuth
Josef Breu
Universitat Bayreuth
Carbon
0008-6223 (ISSN)
Vol. 114 700-705Subject Categories (SSIF 2011)
Chemical Sciences
DOI
10.1016/j.carbon.2016.12.065