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Diamond thin film deposition on Ni in microwave plasma CVD  

Kim, Jin-Kon (Department of Materials Engineering, Miryang National University)
Ryu, Su-Chak (Department of Materials Engineering, Miryang National University)
Cho, Hyun (Department of Materials Engineering, Miryang National University)
Abstract
Two different approaches, namely two-step deposition process and Bias-Enhanced Nucleation (BEN) technique have been examined for deposition of high quality diamond thin film on polycrystalline Ni which has low chemical activity with the carbon neutrals provided from the $CH_4/H_2$mixtures. A two-step deposition process, consisted of pre-deposition of soot layer at lower temperatures and subsequent deposition at higher temperature condition, has been developed to deposit diamond layer directly on Ni substrate. Diamond particles were observed after deposition step at $925^{\circ}C$ for 5 hours and those particles seem to be nucleated from the soot layer pre-deposited at lower temperatures ($810^{\circ}C$). Diamond particles of a substantial size were found on Ni substrate after biasing -220 V for 10 minutes and subsequent deposition for 2 hours while no diamond particles were observed under the conditions without applied bias.
Keywords
Chemical vapor deposition of Diamond; Ni substrate; Soot layer; Bias enhanced nucleation;
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