Effect of exfoliation on the electrical resistivity of intercalated graphite

Exfoliation of graphite-bromine was found to increase the a-axis electrical resistivity (ρ{variant}_a) by a factor of 230 and decrease the c-axis electrical resistivity (ρ{variant}_c) by a factor of 20, so that the anisotropy in the electrical resistivity ρ{variant}_c/ρ{variant}_a) decreased by a factor of 5 × 10⁴. During heating of graphite-bromine, ρ{variant}_c first increased slightly and then decreased abruptly upon exfoliation. During subsequent cooling, ρ{variant}_c increased abruptly upon collapse of the exfoliated structure. The c-axis electrical resistance did not vary much with temperature upon exfoliation or collapse.