Spectroscopic studies of nanocrystalline diamond materials |
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Affiliation: | 1. Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria;2. Leibniz Institute for Solid State and Materials Research Dresden, D-01069 Dresden, Germany;3. ρ-BeSt coating, Hartstoffbeschichtungs GmbH, Exlgasse 20a, A-6020 Innsbruck, Austria |
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Abstract: | The structural and electronic properties of nanocrystalline diamond films synthesized by a modified hot-filament chemical vapour deposition process were investigated by both bulk- and surface-sensitive techniques. Diffraction and microscopy data show the films to consist of diamond grains with an average crystallite size of about 10–15 nm and a root-mean-square roughness of similar size. Carbon core-level excitations in transmission electron energy-loss spectroscopy reveal an sp2 content below 5%. The low energy loss spectra are quite similar to that of diamond crystal. The high sp3 content in the films was also confirmed by C 1s photoelectron plasmon energy loss features in X-ray photoemission experiments and by X-ray excited Auger-electron spectroscopy. We find that the hydrogen covered diamond surface gets contaminated after storage for several months under ambient conditions. Heating up to 500°C in vacuo is required to desorb the adsorbate layer. |
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