Growth Mechanism and Application Prospect of Synthetic Diamond by CVD Method

CVD (Chemical Vapor Deposition) Chemical vapor deposition is the chemical reaction of a heated solid substrate using one or more gases and is coated with a solid film. The so-called CVD (Chemical Vapor Deposition) diamond is a mother stone of natural diamond, which is assisted by high-purity methane, hydrogen, nitrogen and other gases. In the microwave oven, the methane is the same as the diamond. The carbon molecules accumulate on the rough diamonds and form a transparent diamond of up to 10 carats. In order to make the CVD diamond grow smoothly, the carbon source is usually methane with a diamond structure. Methane can be considered a monoatomic diamond that is extruded with hydrogen. This "growth" diamond has the same quality as a natural diamond and is indistinguishable to the naked eye.

The bottleneck of CVD-grown diamond films is to avoid the formation of graphite by hydrocarbons, so the hydrogen atoms should be much more than the carbon source. The carbon source concentration determines the growth rate of the diamond film, but when the carbon source is too high, the hydrogen atoms will not be able to maintain the diamond structure and the decomposed carbon will become graphite. Therefore, the carbon source is too thick and will reduce the rate of conversion into diamonds. The concentration and temperature of the carbon source determine the difference in the rate of growth of the diamond with the direction, and therefore the crystal form of the diamond. The concentration of hydrogen atoms not only determines whether the diamond film can grow, but also determines the quality of the diamond film. The ratio produced by hydrogen atoms is less subject to gas, but is directly related to temperature. As the temperature of the heat source decreases and the distance increases, the concentration of hydrogen atoms also drops sharply.

Effect of CVD (Chemical Vapor Deposition) on diamonds
1. Subverting the value of diamonds The expensive diamonds that used to be said to be in a million years to crystallize can be manufactured in less than a week in the laboratory, subverting the general sense of the value of diamonds.
2. Enhance the use of diamonds in various fields. In the past, diamonds were mostly used as jewellery because of their high prices. Once high-quality diamonds can be produced cheaply, their application value will quickly spread to various fields.
Experts predict that the most important invention of the 21st century will be diamonds that will grow up. One day, cheap diamonds will replace the role of silicon in semiconductors, bringing human technology into another world.
After the mass production of diamonds, it can be more affordable and develop more functions. The diamond has high hardness, excellent thermal conductivity, cutting and grinding properties, and can be used in medical and electronic components.

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