skip to main content

Title: Optical signatures of bulk and solutions of KC{sub 8} and KC{sub 24}

We first performed an analysis of the shape of the Raman features of potassium-intercalated graphite at stage 1 (KC{sub 8} GIC) and 2 (KC{sub 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-pyrrolidone 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.
Authors:
 [1] ;  [2] ; ;  [3] ;  [4] ; ;  [1]
  1. CEMES-CNRS, UPR-8011, Université Fédérale de Toulouse-Midi-Pyrénées, 29 rue Jeanne Marvig, BP 94347 Toulouse, Cedex 4 (France)
  2. (France)
  3. CNRS, CRPP, UPR-8641, Université Bordeaux 1, F-33600 Pessac (France)
  4. LPCNO, UMR-5215 CNRS, INSA, Université Fédérale de Toulouse-Midi-Pyrénées, Université de Toulouse, 135 Avenue de Rangueil, 31077 Toulouse (France)
Publication Date:
OSTI Identifier:
22494651
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLITUDES; CLATHRATES; EXCITATION; FANO FACTOR; FERMI LEVEL; GRAPHITE; MATHEMATICAL SOLUTIONS; POTASSIUM COMPOUNDS; PYRROLIDONES; RAMAN EFFECT; SOLVENTS; TETRAHYDROFURAN; ULTRAVIOLET RADIATION