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Magnetic Centres in Functionalized Graphene

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Majchrzycki Ł., Augustyniak-Jabłokow M., Strzelczyk R., Maćkowiak M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
540-542
EN
Discussion of the origin of paramagnetic centres observed by electron paramagnetic resonance in graphene oxide (GO) and reduced graphene oxide (rGO) is done on the assumption that GO can be considered as a functionalized graphene. This leads to the conclusion that the narrow signal with g close to 2, observed for GO and thermally reduced GO, is due to paramagnetic centres localized on defects and exchange coupled to conduction electrons. Randomness of graphene modification results in variety of parameters of EPR signals. The broad signals observed in GO and rGO and ascribed to magnetic clusters on the zig-zag edge states indicate that the edge magnetism can be preserved by functionalization.
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FMR Evidence of Stable Ferromagnetic Correlations at Zigzag Edge States in Graphene

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Augustyniak-Jabłokow M., Maćkowiak M., Tadyszak K., Strzelczyk R.
Acta Physica Polonica A
|
2015
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vol. 127
|
issue 2
537-539
EN
We studied magnetic properties of a composite of paraffin and graphene flakes. Magnetic properties of this composite were investigated by ferromagnetic resonance/electron spin resonance technique. The ferromagnetic resonance signal from graphene suspension in paraffin is broad and shifted from magnetic field corresponding to g ≈ 2 to the low magnetic field. The temperature dependence of the spectra shows that magnetic ordering in the studied system is sensitive to thermal fluctuations. These features are expected for the 1D ferromagnetism and the obtained results are analyzed in the frame of the theoretical predictions concerning magnetic correlations at graphene edges. Therefore, based on our investigation we can conclude the existence of the magnetic edges in graphene and presence of the ferromagnetic correlations between edge spins.
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