We synthesized diamond via gaseous phase of vaporized acetone. Molecular acetone decomposes to two methyl radicals with thermal activation. We propose here a new method for diamond synthesis with these methyl radicals from molecular acetone. With this method, we successfully synthesized diamond particles with shorter experimental time than conventional method. With liquid carbon source, such as acetone, impurity elements will be easily substituted in synthesized diamond thin, film which has wide applications for the future electronic devices.
For diamond synthesis with gaseous reaction, crystalline materials such as Si and Mo were used as substrates. In this study, we used materials of noncrystalline oxide for substrates, for example, quartz glass.We used unique apparatus for diamond synthesis, completely closed system, no reaction gas was introduced to the chamber and no reactant gas was evacuated from it.Deposits were Identified as diamond with SEM, AFM and Raman spectra. With these results, we successfully confirmed our samples as diamond particles on quartz glass substrate.
Recently, many results were reported by many institutes and companies all over the world for diamond particles or thin films synthesized on crystalline substrates, such as molybdenum, silicon etc. But diamond on amorphous or oxide substrates, were rarely reported. In this study, we used material of amorphous and oxide for substrates, for example quartz glass, Alumina.We used unique apparatus of diamond synthesis. With our apparatus, completely closed system was used, no reaction gas was introduced to the chamber and no reactant gas was evacuated from it. We used graphite rod for heater and carbon source, at the same time.And we compared results with this unique closed system and with conventional flow system. Carbon sources of gaseous state (methane) and solid state ( graphite ), and closed and flow system result the deference of synthesized diamond particles.
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