Study of the optical properties of pyridine intercalated niobium disulphide by electron energy loss spectroscopy |
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Authors: | R Manzke G Crecelius J Fink R Schöllhorn |
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Institution: | Institut für Festkörperforschung Kernforschungsanlage Jülich GmbH Postfach 1913, D-5170 Jülich Federal Republic of Germany;Kernforschungszentrum Karlsruhe Institut für Angewandte Kernphysik Postfach 3640, D-7500 Karlsruhe Federal Republic of Germany;Anorganisch-Chemisches Institut Universität Münster Gievenbecker Weg 9–11, D-4400 Münster Federal Republic of Germany |
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Abstract: | High energy electron energy loss spectroscopy (EELS) has been used to study the influence of the intercalation with pyridine on the optical properties of the host material 2H-NbS2. The optical joint density of states function OJDOS(ω) of the intercalated material is found to be well represented by a linear superposition of the OJDOS of pure NbS2 and that of pyridine. A charge transfer from pyridine to NbS2 of (0.27±0.05) electrons per NbS2 formula unit is deduced from the energy shift of the d-band plasmon loss relative to the pure host material. Assuming this shift to be caused by a change in the charge density contributing to the d-band plasmon is confirmed by an unchanged effective mass of the electrons in the dz2 band upon intercalation as has been deduced from the dispersion of the plasmon in question. |
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