Abstract
We present the results of an electron paramagnetic resonance study (EPR) in the range of 4–290 K on samples of nanographites obtained by ball milling graphite for different times. With a careful simulation of the spectral line shapes, we disentangled the EPR bands, providing the spectral profiles and intensities of the components on varying the temperature, their g tensors, and the homogeneous line widths of the contributing spin packets. We have been able to follow the effect of decreasing progressively the size of the flakes on the EPR bands due to mobile electrons and on Lorentzian lines due to nonbonding electrons on the zigzag edges of the crystallites. The temperature dependence of the EPR intensities shows a common trend for the signals attributed to edge electrons and to mobile electrons, showing that they belong to the same bath.
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Acknowledgments
This project has been funded by the Italian Ministero dell’Istruzione dell’Università e della Ricerca. We thank Dr. V. Causin and Dr. V. di Marco for the chemical characterization of the graphite samples.
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Barbon, A., Brustolon, M. An EPR Study on Nanographites. Appl Magn Reson 42, 197–210 (2012). https://doi.org/10.1007/s00723-011-0285-6
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DOI: https://doi.org/10.1007/s00723-011-0285-6