najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2016-7-1-244-252najo-979Research ArticlePAPERS, PRESENTED AT THE CONFERENCEPAPERS, PRESENTED AT THE CONFERENCEERP study of graphite oxide thermal reduction: the evolution of paramagnetism and conductivityERP study of graphite oxide thermal reduction: the evolution of paramagnetism and conductivityGudkovM. V.GudkovM. V.

Moscow

Moscow

gudkovmv@gmail.comMelnikovV. P.MelnikovV. P.

Moscow

Moscow

melnikov@center.chph.ras.ruSemenov Institute of Chemical PhysicsSemenov Institute of Chemical Physics20161408202571Special Issue: Proceedings of the 12th Biennial International Conference “Advanced Carbon Nanostructures” (ACNS’2015)244252Copyright © Gudkov M.V., Melnikov V.P., 20252025Gudkov M.V., Melnikov V.P.Gudkov M.V., Melnikov V.P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/979

The evolution of paramagnetic centers (PMC) and conductivity of graphite oxide (GO) during its thermal reduction has been studied by electron paramagnetic resonance (EPR) at 150 and 165 ◦C. The GO samples for the study were prepared by systematically varying the KMnO4/Graphite weight ratios in the oxidation reaction. It has been shown that the PMC concentration increase in GO correlates with the intense evolution of gaseous products originating from the former oxygen-containing species of GO. The PMC concentration decrease has been described by the kinetic equation of the first order with an effective ke and an activation energy value of 33 kcal/mol. The values of ke decreased with increasing the quantities of KMnO4 used in graphite oxidation reaction. The changes in GO conductivity were followed by measuring the microwave power absorption in the EPR-spectrometer resonator. The conductivity changes correlated with the decay of the radicals and occurred after the decomposition of the oxygen-containing groups was complete.

The evolution of paramagnetic centers (PMC) and conductivity of graphite oxide (GO) during its thermal reduction has been studied by electron paramagnetic resonance (EPR) at 150 and 165 ◦C. The GO samples for the study were prepared by systematically varying the KMnO4/Graphite weight ratios in the oxidation reaction. It has been shown that the PMC concentration increase in GO correlates with the intense evolution of gaseous products originating from the former oxygen-containing species of GO. The PMC concentration decrease has been described by the kinetic equation of the first order with an effective ke and an activation energy value of 33 kcal/mol. The values of ke decreased with increasing the quantities of KMnO4 used in graphite oxidation reaction. The changes in GO conductivity were followed by measuring the microwave power absorption in the EPR-spectrometer resonator. The conductivity changes correlated with the decay of the radicals and occurred after the decomposition of the oxygen-containing groups was complete.

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The authors declare that there are no conflicts of interest present.