High temperature in the process (discharging) for the synthesis of electric nanotubes ( the carbon in the negative electrode is sublimated)

 _ Process section (discharge)  for electrical nanotubes

High temperature  in the process (discharging)  for the synthesis of electric nanotubes ( the carbon in the  negative electrode is sublimated)

Researcher  and author: Dr.   (   Afshin Rashid)

Note: In this process (CVD), the carbon in the  negative electrode is sublimated, the reason for this  is the high temperature in the discharge process. Since  this method was used for the synthesis of nanotubes for the first time  , it is known as the most common method of  carbon nanotube production. In this method,  there are both types of nanotubes, single-walled and  multi-walled, with lengths up to 50 microns containing  structural defects.

In the process of laser radiation, a laser is used to vaporize  graphite and an inert gas  is used to direct 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 by  using  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 nanotubes can be controlled as desired by changing the temperature.

Carbon nanotubes are produced and propagated using  different methods, such as CVD, laser irradiation, and discharge  . 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. He used the CVD method with the help of  a catalyst to produce carbon nanotubes  . During the CVD process, a layer of  nickel, cobalt and  metal catalyst particles, generally  iron, is used to produce 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. By  patterning the substrate, using heat treatment and  plasma etching of the catalyst,  the diameter of the nanotubes can be controlled.

Conclusion :

In this process (CVD), the carbon in the  negative electrode is sublimated, the reason for this  is the high temperature in the discharge process. Since  this method was used for the synthesis of nanotubes for the first time  , it is known as the most common method of  carbon nanotube production. In this method,  there are both types of nanotubes, single-walled and  multi-walled, with lengths up to 50 microns containing  structural defects.

Researcher  and author: Dr.   (   Afshin Rashid)

Specialized doctorate in nano-microelectronics