Abstract
Recent successful industrial applications of ultra dispersed diamond have triggered additional scientific interest in its structure and surface properties, as well as changes in these properties upon various post-treatments. In this work, we report a systematic study of the structure of nanocrystalline diamond powder before and after sintering by using multi-wavelength Raman spectroscopy, high resolution transmission electron microscopy, and sorption measurements. Purified nanodiamond powder showed the presence of amorphous carbon and carbon onions and had a specific surface area of about 200 m 2/g. Sintering performed for 3 min at 4.5–7 GPa of quasi-hydrostatic pressure at 1400 °C resulted in the decrease of sp 2 carbon content in the diamond sample, an increase in the average size of diamond grains, and noticeable broadening of the grain size distribution. Sintered nanodiamond retained a porous structure and demonstrated a specific surface area of about 135 m 2/g. The produced material can be used as a fine abrasive powder, as a stationary phase in chromatography or as a durable bio-compatible membrane (filter) for bio-medical applications. This work demonstrated the successful sintering of nanodiamond and could be used for optimizing the production process of the porous nanocrystalline diamond with desired characteristics.
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