Abstract
We present ways to observe intercalant vibrations in Graphite Intercalation Compounds (GICs), using Raman and IR reflectivity methods. It is shown that, for symmetry reasons light polarized parallel to the "c" axis is much less absorbed than light polarized perpendicular to it. Consequently the scattering volume becomes large, facilitating the observation of Raman scattering from intercalants. Indeed Raman scattering measurements using the "a" face of stage 1 C/AsF5 reveal 3 intercalant lines in addition to the line of AsF5 gas. The IR reflectivity from an interface between a GIC and an Infrared transparent material is analysed. It is shown that under certain conditions, light with frequency below the plasma edge will penetrate into the GIC. Moreover the sensitivity to lattice vibrations increases by almost two oders of magnitude in comparison to the sensitivity of IR reflectivity measurements at an air GIC interface.
Original language | English |
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Pages (from-to) | 321-326 |
Number of pages | 6 |
Journal | Synthetic Metals |
Volume | 23 |
Issue number | 1-4 |
DOIs | |
State | Published - Mar 1988 |