Double Walled Carbon Nanotubes | Image Resource : ltsm.mead.upatras.gr
Carbon nanotubes even referred as CNTs are defined as cylindrical nanostructure made from a cluster of graphene. The atoms used in the formation of this structure form a honeycomb pattern. The structure and size of these tubes have given them the ability to showcase their potential in several sectors such as mechanical, electrical, optics, nanotechnology and material science too.
Their extraordinary thermal and electrical conductivity has made them additives in a wide range of products. For example, a fraction of these tubes is used in lubricants, sunscreens, MEMS and many more.
Now, every CNTs is not the same. These tubes are divided into different categories in accordance to the number of walls that they hold, like Single Walled Carbon Nanotubes (SWNTs), Double Walled Carbon Nanotubes (DWNTs), Triple Walled Carbon Nanotubes (TWNTs) and Multi-Walled Carbon Nanotubes (MWNTs). The change in the number of walls gives these tubes the ability to perform different applications. Taking that into account, this article is going to focus on the uses of DWNTs and how beneficial it can be.
The bonding between DWNTs is described with the help of quantum chemistry, especially using orbital hybridization. The bonding is composed of sp2 bonds which are quite similar to that of graphite. These types of bond are much stronger than the usual sp3 bonds mostly found in diamonds and alkanes and this is what gives it its unique strength.
Those that have double wall are part of a special class of CNTs. The reason behind this is that the morphology of DWNTs is similar to that of SWNTs, however the resistivity that double walled nanotubes have to offer is a lot higher.
The resistivity turns out to be of utmost importance when effective functionalization is required. Here, functionalization refers to the grafting of different types of chemical functions on the surface. So, with the help of double walled carbon nanotubes new properties can be added to the same structure. This is what has made these nanotubes extremely popular amongst researchers. As in case of DWNTs the outer wall of the carbon nanotubes can be easily modified and the same would drive better electrical and mechanical properties.
Thus, there are certain features projected by the double walled nanotubes which single walled carbon nanotubes failed to offer. This is because just as the name suggests SWNTs is made with a single layer where modification was next to impossible.
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