Chemical vapor method or CVD in the synthesis of nanocarbon devices (PhD in nano-microelectronics)
Researcher and author: Dr. ( Afshin Rashid)
Note: Carbon nanotubes are produced and propagated using various methods , such as CVD, laser irradiation and deburring . The CVD method is the best option for the industrial production of carbon nanotubes. The reason for this is the low cost-to-income ratio as well as the possibility of vertical growth of nanotubes on the desired substrate .
In this process, the carbon in the negative electrode is sublimated due to the high temperature in the discharge process. Since this method was first used to synthesize nanotubes , it is known as the most common method of producing carbon nanotubes. In this method, which has both types of nanotubes, single-walled and multi-walled, with lengths up to 50 microns containing structural defects. In the laser irradiation process, the laser is used to evaporate the graphite and an inert gas is used to conduct these vapors into the tank. Carbon nanotubes grow on the cold surface of the reactor . It is suitable for the production of multi-walled carbon nanotubes. And with Use of graphite composite and metal catalyst particles of cobalt and nickel combination (for the synthesis of carbon nanotubes) CNT and CNTs are used. The efficiency of this process is 70 % and its main product is single-walled and multi-walled carbon nanotubes. The diameter of these nanotubes is completely controllable and the diameter of the nanotubes can be controlled as desired by changing the temperature .
Catalyst- assisted CVD method was used to produce carbon nanotubes . During the CVD process, a layer of nickel, cobalt, and metal catalyst particles, iron is commonly used to make carbon nanotubes . CVD is a common method for the commercial production of carbon nanotubes. In this method, the diameter of the nanotubes is related to the dimensions of the metal particles. The diameter of the nanotubes can be controlled by patterning the substrate, using heat treatment and pulsating the catalyst .
Conclusion:
If a strong electric field is used to grow carbon nanotubes, the nanotubes will grow along the applied field . The CVD method is the best option for the industrial production of carbon nanotubes. The reason for this is the low cost-to-income ratio as well as the possibility of vertical growth of nanotubes on the desired substrate .
Researcher and author: Dr. ( Afshin Rashid)
PhD in Nano-Microelectronics