Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5395978 | Journal of Electron Spectroscopy and Related Phenomena | 2014 | 10 Pages |
Abstract
The commercial graphene oxide (FL-GOc) shows a stacking nanostructure of about 22Â ÃÂ 6Â nm average diameter by height with the distance of 0.9Â nm between 6-7 graphene layers, whereas the respective reduced graphene oxide (FL-RGOc)-about 8Â ÃÂ 1Â nm average diameter by height stacking nanostructure with the distance of 0.4Â nm between 2-3 graphene layers (XRD). The REELS results are consistent with those by the XRD indicating 8 (FL-GOc) and 4 layers (FL-RGOc). In graphene oxide and reduced graphene oxide prepared from the graphite the REELS indicates 8-11 and 7-10 layers. All graphene oxide samples show the C/O ratio of 2.1-2.3, 26.5-32.1 at% of C sp3 bonds and high content of functional oxygen groups (hydroxyl-COH, epoxy-COC, carbonyl-CO, carboxyl-COOH, water) (XPS). Reduction increases the C/O ratio to 2.8-10.3, decreases C sp3 content to 11.4-20.3 at% and also the content of COC and CO groups, accompanied by increasing content of COH and COOH groups. Formation of additional amount of water due to functional oxygen group reduction leads to layer delamination. Removing of functional oxygen groups and water molecules results in decreasing the distance between the graphene layers.
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Authors
L. Stobinski, B. Lesiak, A. Malolepszy, M. Mazurkiewicz, B. Mierzwa, J. Zemek, P. Jiricek, I. Bieloshapka,