An EPR Study on Nanographites |
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Authors: | Antonio Barbon Marina Brustolon |
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Institution: | 1.Dipartimento di Scienze Chimiche,Università di Padova,Padua,Italy |
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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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