Stable aqueous colloidal solutions of graphene oxide stabilized with sodium polyphosphate were obtained. During irradiation of the colloids the oxygen-containing groups of the graphene oxide are eliminated, and the aromatic graphite-like regions in its composition are expanded. This is accompanied by decrease in the energy of the electronic transitions Ebg in such sp2-hybridized fragments. Photoreduction of the colloidal particles of graphene oxide leads to changes in their hydrodynamic size, resulting from 𝜋𝜋 interactions between the aromatic fragments in the particles. It was shown that the Ebg value can be varied purposefully in the range of 0.5-1.9 eV by varying the experimental conditions.
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The work was carried out within the scope of the targeted complex program of fundamental investigations of the National Academy of Sciences of Ukraine “Fundamental problems of nanostructured systems, nanomaterials, nanotechnologies” with support from the State Fund for Fundamental Research of Ukraine (project No. F41.2/005). The authors are grateful to O. S. Litvin and V. N. Dzhagan (V. E. Lashkaryov Institute of Semiconductor Physics) for assistance in the production of the data from atomic-force microscopy and Raman spectroscopy respectively.
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Translated from Teoreticheskaya i Éksperimental’naya Khimiya, Vol. 48, No. 1, pp. 1-11, January-February, 2012.
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Stroyuk, A.L., Andryushina, N.S., Shcherban’, N.D. et al. Photochemical reduction of graphene oxide in colloidal solution. Theor Exp Chem 48, 2–13 (2012). https://doi.org/10.1007/s11237-012-9235-0
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DOI: https://doi.org/10.1007/s11237-012-9235-0