The growth rate of the nano-diamond film is very slow, and the conventional diamond film layer has not been completely covered, and the corners of the conventional diamond particles are also exposed on the outer surface. As the deposition time prolongs, the portion of the conventional diamond particles exposed to the outer surface gradually becomes smaller, and the micro-diamond particles are completely invisible at 4 hours.The entire micron diamond film surface has been completely covered by the nano-diamond film, and the diamond particles are very small and the surface is very smooth.
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