In nanoelectronics, liquid nitrogen medium is used to produce carbon nanotubes by arc method (PhD in nano-microelectronics)

Researcher  and author: Dr.   (   Afshin Rashid)



Note: In nanoelectronics, the arc method was used to produce carbon nanotubes. This method uses an almost low voltage source to create a spark between the two electrodes. Intermediate metal catalysts are added to the graphite anode to accelerate the production of carbon nanotubes. 

The catalyst can be mixed with a graphite anode in two ways:

Adding a mixture of catalyst and graphite powder to the coaxial holes in the anode; 

2 - Homogeneous mixing of catalyst in the graft anode.

During ignition, a large electric current (between 51 and 001) amps (passes between two electrodes approximately one millimeter apart) in the chamber  , then carbon nanotubes with a handful of by-products produced on The cathode is collected. It is difficult to control  this method due to its high temperature (about 3011 K). Also, to perform this method, the environment around the device must be empty and  at a low pressure between 001 and 301. Tor. This process, such as laser abrasion, In the environment of an inert gas (usually helium or argon  ). The role of gas in this process is to stabilize the electric spark, which leads to sedimentation conditions. Arc stability  and applied current intensity are the factors affecting the production efficiency of carbon nanotubes with this method. Disadvantages of this method include its high cost, high heat intensity and the production of unwanted additives such as graphite particles. The nanotubes  produced in this way are highly rope-shaped and multi-walled. In nanoelectronics, liquid nitrogen medium was used to produce carbon nanotubes by arc method. The liquid environment creates an  oxygen-free environment to react and cool the products. Therefore, using a liquid medium, this method becomes cheaper and more cost-  effective.


Note: Carbon nanotubes are used in the production of nanotransistors in nanoelectronics and nanotransistors play a key role in the production of nanoparticles.

In nanoelectronics, single-walled carbon nanotubes are produced instead of multiple walls. Its efficiency depends on the type of metal catalyst. The diameter of these  nanotubes is between 5 and 01 nanometers and their length grows by hundreds of micrometers. It is worth noting that the ends of all single-walled nanotubes are  completely closed with a hemispherical cap. Single-walled carbon nanotubes produced by this method are purer than nanotubes produced by  other methods.


Conclusion : 
In nanoelectronics, he used the arc method to produce carbon nanotubes. This method uses an almost low voltage source to create a spark between the two electrodes. Intermediate metal catalysts are added to the graphite anode to accelerate the production of carbon nanotubes. 

Researcher  and author: Dr.   (   Afshin Rashid)

PhD in Nano-Microelectronics