Like Graphene, Carbon Nanotubes (CNTs) are a special allotrope of Carbon. But while Graphene is an allotrope of Carbon with a one-dimensional sheet structure on the molecular level, Carbon Nanotubes go one step further and have this one-dimensional sheet structure rolled up to a molecular tube with one or multiple layers.
Just like Graphene, this molecular structure has a large impact on its properties.
Many of these properties are like Graphene.
High tensile strength, low density and advantageous electric conductivity, all of which are properties that make CNTs very interesting for most applications and are also the reason why Graphene is sought after. But while the thermal conductivity of CNTs is lower, which can be a beneficial trait depending on the application, its tensile strength and electric conductivity tend to be even higher compared to the already impressive performance of Graphene.
As a result, it is no surprise that the market is still far from realizing the full industrial potential of CNTs, which will require many more years of growth and development.