Coming from the family of fullerene structural, a Carbon Nanotube is a product of carbon that appears in a tube-shaped material and has a diameter measured on the nanometre scale. A single thick sheet of graphite, when rolled-up to form a continuous unbreakable hexagon, takes the shape of a carbon nanotube.
All that you need to know about Carbon Nanotubes!
Way back in the year 1991, it was Dr. Sumio Iijima at NEC, who discovered the little innovation of a new carbon allotrope in as ‘Carbon Nanotubes’. In simplest words, Carbon Nanotubes (CNT) is a tubular form of carbon and you can define it as a sheet of graphite rolled into a cylindrical shape. The diameter of this form of carbon is somewhat as minute as 1 nanometer. The structure of CNT is nanometer-scale hollow tubular. The atomic configuration and structure is very unlike any other form of carbon allotropes. CNT is different- way more different that diamond and graphite in atomic arrangement.
So how large is CNT?
It is said that if you will ever cross-sect a human hair for about 80,000 times, then it will be still larger than the CNT. Carbon Nanotube’s cross-section is minutest to this extent! CNT can be one or multiple layered, as it is constructed from the rings of carbon (in hexagonal shape).
Carbon Nanotubes- The Classification!
CNT is basically available in two major forms i.e. Single Walled Nanotubes (SWNT) and Multi Walled Nanotubes (MWNT). Apart from these, CNT is also available through other structures of Torus, Nanobud, Graphenated Carbon Nanotubes, Nitrogen Doped Carbon Nanotubes, Peapod, and Cup-Stacked Carbon Nanotubes.
Single Walled Nanotubes (SWNT): Working best for the purpose of electricity conductivity, SWNT shows the best metallic and semiconducting behavior. The diameter of SWNT is as minute as 1 nanometer and the Band gap is somewhere in between 0 to 2ev. SWNT is nothing but a single atom thick layer of Graphene structured in a seamless cylindrical form.
Multi Walled Nanotubes (MWNT): Unlike SWNT that is prepared with a single atomic thick sheet of Graphene, MWNT has multiple rolls of Graphene layers. The Graphene layer in MWNT is presented in concentric tube-shaped form. The distance between two atomic sheets of Graphene is about 3.4 A. MWNT is broadly described in two major forms: 1) Russian Doll Model and 2) Parchment Model.
Carbon Nanotubes and Properties:
The Core Strength:
If you have to evaluate a material in terms of tensile strength and elastic modulus, then you wouldn’t be able to find something as stronger, stiff and flexible as CNT.
How hard is it?
CNT has a greater hardness than diamond, even though the latter is considered to be the hardest material of all! The hardness of CNT is about 152 GPA. In the bulk modulus, it is as hard as 462 to 546 GPA.
How good is it as an electricity conductor?
Both huge and high! Since the symmetry and unique electronic structure of Graphene is favorable for conducting electricity, CNT is highly acceptable for directing high current capacity.
What about the Thermal conductivity and properties?
Just like all nanotubes that are expected to be good thermal conductors, CNT is also an excellent thermal conductor. Crosswise to the tube axis, CNT is a good insulator.
At NanoSmiths, we provide the best CNT solutions to different industries and clients situated all across the globe. NanoSmiths specializes in providing both Single Walled Nanotubes (SWNT) and Multi Walled Nanotubes (MWNT).