“Functional Carbon Materials R&D Group”at CNITECH has achieved a series of technical breakthroughs in synthesis of large-size CVD diamond single crystals.They successfully exploited MPCVD equipment that can generate high-density, stable plasma available for high-speed single crystalline diamond growth. The growth rate reaches70 μm/h when using H2 and CH4mixture gas, and that can be over 150 μm/h as putting N2addition. Also, this group developed proprietary synthesis process that can eliminate the deposition “edge-effect”, ensuring single crystalline diamond contiguous growth without formation of polycrystalline particles on the substrate edges.Comparing with the importing apparatus and techniques,these approaches developed at CNTECH has a cost-down over 60% for single crystalline diamond fabrication, and these achievements have been transfer into industrialization filedat Ningbo, aiming at accelerating domestic CVD diamond precision tool and carat-grade diamond jewelry commercialization progress.

Prof. Jiang Nan: jiangnan@nimte.ac.cn

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