Electric carbon nanotubes and various methods , such as CVD, laser irradiation and discharge

 _Part of the process (discharging)  for electric nanotubes

Electric carbon nanotubes and  various methods  , such as CVD, laser irradiation and discharge 

Researcher   and author: Dr.   (  Afshin Rashid)

Note: Carbon nanotubes  are produced and propagated using various 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. 

In this process, the carbon in the  negative electrode is sublimated, which  is due to 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. 

This process  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.

 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 :

If a strong electric field is used to grow carbon nanotubes  , the nanotubes  will grow in the direction of the applied field. 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)

Specialized doctorate in nano-microelectronics