Optical signatures of bulk and solutions of KC_8 and KC_(24)

摘要

We first performed an analysis of the shape of the Raman features of potassium-intercalated graphite at stage 1 (KC_8 GIC) and 2 (KC_(24) GIC), respectively. By varying the excitation energy from ultraviolet to infrared, we observed a sign change of the Fano coupling factor below and above the optical transition related to the shift of the Fermi level which was determined from first principle calculations. This behavior is explained by a sign change in the Raman scattering amplitude of the electronic continuum. The GICs were then dissolved in two different solvents (N-Methyl-2-pyrroli-done and tetrahydrofuran), and the absorbance of the graphenide solutions obtained was measured in the UV range. Two peaks were observed which correspond to the maximum of the computed imaginary part of the optical index.