Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 13, Pages 6788-6793Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp311727t
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Funding
- Future Fellowship
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Graphene oxide (GO) possesses unusual electronic and mechanical properties, including the ability to stabilize graphene radicals (GRs). However, controlled generation of GRs remains a challenge for applications requiring large-scale production. In this study, we demonstrate controlled production of GRs by UVB irradiation of GO solutions. Electron paramagnetic resonance spectroscopy of GO solutions revealed a dose-dependent exponential growth in radical production as a function of UVB exposure time. The GRs were air-stable over a long period, both in the solution state and in freeze-dried powders, suggesting they are graphene-based phenalenyl-like radicals. The redox activity of GRs was demonstrated by their ability to oxidize the chromophore 3,5,3',5'-tetramethylbenzidine, with oxidation capacity of GO increasing with GR content.
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