Multi-walled Carbon Nanotube (MWCNT) Interior Design (Based on Nano-Electronics Ph.D.)

Researcher and author: PhD student  :  Afshin Rashid)


Note:  There are two approaches to making a memory element: the use of different transistors, such as the electrical properties of  nanotubes to compete with semiconductor devices, and the use of mechanical properties of  nanotubes to produce a dual-mode device that can be used as memory.

Multiwalled carbon nanotubes (MWCNTs) are also divided into two groups in terms of conductivity: 

1 (metal)

2 (semiconductor)

Multi-walled carbon nanotubes  (MWCNTs)  have many electrical and mechanical and chemical properties and multi-walled carbon nanotubes are inherently p-type semiconductors and  react with metal electrodes. And  when induced (impurity synthesis).  This type of nanotubes reacts with atmospheric oxygen. 


MWCNT multi-walled carbon nanotubes  also work  based on the electromechanical properties of carbon nanotubes. Although they  have some drawbacks, their benefits are greater and are a good idea to build comprehensive memory,  Multiwalled Carbon Nanotubes (MWCNTs) is a special form of carbon nanotubes in which several single-walled carbon nanotubes are interconnected. Although MWCNT still classified as a form of carbon one-dimensional, but the unique properties of  carbon nanotubes single wall  and double wall  can be seen  is not outstanding. The reason for this is the higher probability of a defect. These disadvantages are offset by increased dispersion of MWCNTs and reduced costs in the synthesis and purification of these materials.

(MWCNTs) contain several carbon nanotubes that are interconnected. The number of MWCNTs in a MWCNT may vary - from 3 to 3 to more than 20. At the same time, the diameter of both the inner and outermost nanotubes can vary - from 2 nm for the inner tube, to Over 50 nm for the outer wall. Just like single-walled nanotubes, they have exceptional electrical, thermal, and mechanical properties. However, due to the increasing number of walls, it is more likely to be defective than single-walled nanotubes - thereby reducing performance. The outer walls of MWCNTs can be modified using functional groups such as hydroxides, carboxylic acids or amides to generate additional functionality (eg improved dispersion).

Conclusion : 

MWCNTs  can be produced in large quantities and are easier to clean (compared to single-walled and double-walled nanotubes). This makes their production costs significantly lower and is a reason for their acceptance in various fields of scientific research. MWCNT applications are mainly focused on their use in composites which can be used as additives. To improve the mechanical properties of a material, or to improve the electrical properties of a material. Aside from being used as an additive.

Author: Engineer Afshin Rashid 

PhD student of Nano-Microelectronics at Islamic Azad University, Science and Research Branch, Tehran