Evolution of Heterogeneity and Chemical Functionality during the Oxidation of Graphite

Harish V. Kumar; Andrew J. Oyer; Kevin Y. -S. Huang; Douglas H. Adamson

doi:10.3390/colloids6030044

Colloids and Interfaces (Aug 2022)

Evolution of Heterogeneity and Chemical Functionality during the Oxidation of Graphite

Harish V. Kumar,
Andrew J. Oyer,
Kevin Y. -S. Huang,
Douglas H. Adamson

Affiliations

Harish V. Kumar: Institute of Materials Science Polymer Program, University of Connecticut, Storrs, CT 06269, USA
Andrew J. Oyer: Institute of Materials Science Polymer Program, University of Connecticut, Storrs, CT 06269, USA
Kevin Y. -S. Huang: Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA
Douglas H. Adamson: Institute of Materials Science Polymer Program, University of Connecticut, Storrs, CT 06269, USA

DOI: https://doi.org/10.3390/colloids6030044
Journal volume & issue: Vol. 6, no. 3
p. 44

Abstract

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A kinetic study of graphite oxidation provided several insights into the mechanism of graphite oxide (GO) synthesis. The oxidation was observed to occur in two distinct stages, with the first stage lasting for 20 to 30 min and including a rapid disruption of the graphene sp2 network, the introduction of oxygen functional groups, and an increase in the spacing between the sheets. The second stage saw a marked decrease in the rate of change in spacing, a significant increase in the homogeneity of the GO, little to no further disruption of the sp2 network, and continuing evolution of the oxygen functionality. The study was based on the analysis by Raman spectroscopy, XRD, FTIR, SEM, and TGA of material taken at various times from a modified Hummers oxidation reaction following work up.

Published in Colloids and Interfaces

ISSN: 2504-5377 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry
Website: http://www.mdpi.com/journal/colloids

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