Process parameters for diamond synthesis assisted by DC plasma using a water-ethylene glycol solution
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Influence of the liquid composition, concentration of the potassium acetate, substrate-liquid distance and liquid layer thickness on the diamond formation were surveyed under a constant current for deposition during 1 h. Optimum deposition conditions were found to be 0.1 mol % potassium acetate, 8 mm substrate-liquid distance and 10–20 mm liquid layer thickness. Diamond forming liquid composition was then examined under a constant substrate temperature. It ranged from 60 to 99.9 mol % ethylene glycol; end compositions showed a poor yield. A constant substrate temperature was maintained under a constant current for temperatures lower than 900 °C. However, an important current reduction was required during the deposition to keep the substrate temperature higher than 1000 °C.
KeywordsPolymer Ethylene Glycol Substrate Temperature Deposition Condition
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