Submit to FacebookSubmit to TwitterSubmit to LinkedIn

Journal of Nutritional Therapeutics

Diamond Deposition on Graphite in Hydrogen Microwave Plasma

Kaili Yao, Bing Dai, Victor Ralchenko, Guoyang Shu, Jiwen Zhao, Kang Liu, Lei Yang, Andrey Bolshakov , Jiecai Han and Jiaqi Zhu

 

Abstract: Hydrogen plasma etching of graphite generates radicals that can be used for diamond synthesis by chemical vapor deposition (CVD). We studied the etching of polycrystalline graphite by a hydrogen microwave plasma, growth of diamond particles of the non-seeded graphite substrates, and characterized the diamond morphology, grain size distribution, growth rate, and phase purity. The graphite substrates served simultaneously as a carbon source, this being the specific feature of the process. A disorder of the graphite surface structure reduces as the result of the etching as revealed with Raman spectroscopy. The diamond growth rate of 3 – 5 µm/h was achieved, the quality of the produced diamond grains improving with growth time due to inherently nonstationary graphite etching process.

Keywords: Microwave plasma, diamond deposition, hydrogen plasma, graphite, etching.

Submit to FacebookSubmit to TwitterSubmit to LinkedIn