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
University of Bayreuth
Renée Siegel
University of Bayreuth
Herbert Thurn
University of Bayreuth
Jens W. Neubauer
Leibniz Institute for Polymer Research
Maximilian Seuss
Leibniz Institute for Polymer Research
Tamás Szabó
University of Szeged / Szegedi Tudományegyetem
Alexandr V. Talyzin
Umeå University
C. E. Halbig
Lehrstuhl für Organische Chemie II
Siegfried Eigler
Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry
Daniel A. Kunz
University of Bayreuth
Andreas Fery
Leibniz Institute for Polymer Research
Technische Universität Dresden
Georg Papastavrou
University of Bayreuth
Jürgen Senker
University of Bayreuth
Josef Breu
University of Bayreuth
Carbon
0008-6223 (ISSN)
Vol. 114 700-705Subject Categories
Chemical Sciences
DOI
10.1016/j.carbon.2016.12.065