Chemical Reduction of Individual Graphene Oxide Sheets as Revealed by Electrostatic Force Microscopy

We report continuous monitoring of heterogeneously distributed oxygenated functionalities on the entire surface of the individual graphene oxide flake during the chemical reduction process. The charge densities over the surface with mixed oxidized and graphitic domains were observed for the same fla...

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Published inJournal of the American Chemical Society Vol. 136; no. 18; pp. 6546 - 6549
Main Authors Kulkarni, Dhaval D, Kim, Songkil, Chyasnavichyus, Marius, Hu, Kesong, Fedorov, Andrei G, Tsukruk, Vladimir V
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 07.05.2014
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Summary:We report continuous monitoring of heterogeneously distributed oxygenated functionalities on the entire surface of the individual graphene oxide flake during the chemical reduction process. The charge densities over the surface with mixed oxidized and graphitic domains were observed for the same flake after a step-by-step chemical reduction process using electrostatic force microscopy. Quantitative analysis revealed heavily oxidized nanoscale domains (50–100 nm across) on the graphene oxide surface and a complex reduction mechanism involving leaching of sharp oxidized asperities from the surface followed by gradual thinning and formation of uniformly mixed oxidized and graphitic domains across the entire flake.
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ISSN:0002-7863
1520-5126
DOI:10.1021/ja5005416