Chemical Reduction of Individual Graphene Oxide Sheets as Revealed by Electrostatic Force Microscopy
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- 作者：Dhaval D. Kulkarni ; Songkil Kim ; Marius Chyasnavichyus ; Kesong Hu ; Andrei G. Fedorov ; Vladimir V. Tsukruk
- 刊名：Journal of the American Chemical Society
- 出版年：2014
- 出版时间：May 7, 2014
- 年：2014
- 卷：136
- 期：18
- 页码：6546-6549
- 全文大小：290K
- 年卷期：v.136,no.18(May 7, 2014)
- ISSN：1520-5126
文摘
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鈥?00 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.