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Graphite oxide by “chlorate route” oxidation without HNO3: Does acid matter?
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-3881-6764
Department of Chemistry and INANO, Aarhus University, Langelandsgade 140, Aarhus C, Denmark; MAX IV Laboratory, Lund University, Fotongatan 2, Lund, Sweden.
MAX IV Laboratory, Lund University, Fotongatan 2, Lund, Sweden.
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2024 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 221, article id 118899Article in journal (Refereed) Published
Abstract [en]

Very strong difference in many properties is well documented for graphite oxides (GtO) synthesized by Brodie (BGO) and Hummers (HGO) methods. The difference is typically assigned to the type of oxidant (chlorates or KMnO4, respectively). However, not only oxidants but also acids used in these methods are different. It is still unclear which of the different properties of GtO are dependent on the oxidant or acid used in the synthesis. Here we synthesized a new type of graphite oxide using an oxidation agent typical for the Brodie method (KClO3) in combination with acids so far used only in modified Hummers' method (H2SO4+H3PO4). The GtO synthesized by this method (MGO) demonstrates some properties similar to BGO (higher temperature of exfoliation and less defected structure) but also similarity to some other properties of HGO (absence of sharp swelling transitions). Comparing MGO, BGO, and HGO allows us to distinguish the effects of acids and oxidants on the properties of graphite oxides. The new procedure proposed in this study allows preparation of GtO nearly free from hole/vacancy defects (similarly to BGO) but avoids dangerous HNO3. MGO is suggested as a favorable precursor for the preparation of graphene films by thermal or chemical reduction methods.

Place, publisher, year, edition, pages
2024. Vol. 221, article id 118899
Keywords [en]
Chemical oxidation, Graphene oxide, Graphite, Graphite oxide, Swelling
National Category
Condensed Matter Physics Materials Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-221389DOI: 10.1016/j.carbon.2024.118899Scopus ID: 2-s2.0-85184999821OAI: oai:DiVA.org:umu-221389DiVA, id: diva2:1840867
Funder
Swedish Energy Agency, 50620-1The Kempe FoundationsAvailable from: 2024-02-27 Created: 2024-02-27 Last updated: 2024-02-27Bibliographically approved

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Gurzęda, BartoszBoulanger, NicolasTalyzin, Aleksandr V.

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