Abstract
The influence of intercalation and exfoliation on the electron density of graphene layers and the defect subsystem of natural graphites was investigated by positron lifetime spectroscopy. In natural graphites two positron annihilation channels with τ 1 = 154−228 ps and τ 2 = 378−615 ps were observed. Intercalation and exfoliation generate a third channel with τ 3 = 1.87−2.18ns caused by positronium annihilation of defects. The effect of pressing on the annihilation parameters was studied, and an analysis of experimental results carried out.
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