Abstract
The modifications of the sp2 carbon phases in CVD nanocrystalline diamond with 25 nm grain size are analysed by ultra-violet source Raman spectroscopy, Fourier transformed infra-red spectroscopy (FTIR) and and X-ray photoelectron spectroscopy (XPS), according to different thermal annealing treatments. Hydrogen concentration is measured by secondary ion mass spectrometry. The hydrogen outdiffusion of the sample as a function of temperature is recorded by mass spectrometry. The Raman spectra show evolution of the signal of the two G and D bands at 1360 and 1530 cm-1 related to more or less disordered sp2 phases, and of the 1150 cm-1 peak attributed to acetylenic chains located at grain boundaries. Thermal annealing breaks the short distance order in sp2 phases. FTIR and XPS analysis show that the sp2 CHx bonds are the less stable and that the superficial sp3 diamond carbon bonds recover as a result of the hydrogen departure.
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