Systematic evaluation of different types of graphene oxide in respect to variations in their in-plane modulus

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 μm by conve...

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Bibliographic Details
Main Authors: Feicht Patrick
Siegel Renee
Thurn Herbert
Neubauer Jens W.
Seuss Maximilian
Szabó Tamás
Talyzin Alexandr V.
Halbig Christian E.
Eigler Siegfried
Kunz Daniel A.
Fery Andreas
Papastavrou Georg
Senker Jürgen
Breu Josef
Format: Article
Published: 2017
Series:CARBON 114
doi:10.1016/j.carbon.2016.12.065

mtmt:3181936
Online Access:http://publicatio.bibl.u-szeged.hu/17734
Description
Summary: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 μm 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. © 2016
Physical Description:700-705
ISSN:0008-6223