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- W2007099094 abstract "The influence of high temperature annealing of hydrogenated diamond films with average grain size of ∼300 and ∼5 nm on surface degradation by graphitization is reported. Ex situ microwave plasma hydrogenation was applied to obtain fully hydrogenated diamond surfaces. Hydrogen bonding and near surface phase composition of both films were studied by high resolution electron energy loss spectroscopy (HR-EELS) and electronic EELS. C–H vibrational modes, phonon losses, and their overtones were measured by HR-EELS and bulk and surface plasmons by EELS. In situ vacuum annealing at 1000 °C results in hydrogen desorption and reconstruction of both kinds of surfaces, detected by vanishing of C–H peaks and appearance of sp2 hybridized carbon features. Our results suggest that graphitization induced by hydrogen desorption occurs to a larger extent on the surface of ∼5 nm grain size films. Subsequent in situ atomic hydrogen exposure of both films’ surfaces results in hydrogen adsorption and recovery of the diamond surface, as evidenced by C–H vibrational modes and optical phonon losses. In both cases the film surface does not recover to its previous state, while the degree of degradation is larger for the ∼5 nm diamond grain size, where a clear mixed carbon sp2/sp3 near surface phase composition is evidenced from both HR-EEL and EEL spectra." @default.
- W2007099094 created "2016-06-24" @default.
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- W2007099094 date "2008-10-15" @default.
- W2007099094 modified "2023-09-23" @default.
- W2007099094 title "Hydrogenation and thermal stability of nano- and microcrystalline diamond films studied by vibrational electron spectroscopy" @default.
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- W2007099094 doi "https://doi.org/10.1063/1.3000662" @default.
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