What is graphene?

A single, 2 dimensional layer of graphite is called graphene. So, graphene is basically a sheet of carbon atoms arranged in a hexagonal layout. Graphene is considered the first 2D material ever discovered, and is also called a ”wonder material” thanks to an enormous group of properties it holds. For example, graphene is one of the strongest materials in universe, has superior thermal and optical properties, excellent tensile strength, relative transparency, amazing electrical conductivity, and impermeability to most gases and liquids and more.

Graphene’s many attributes make it an attractive material for researchers and developers, which are working hard all over the world to find endless uses for the material. Graphene’s tial is vast, and the applications include: touchscreens (for LCD or OLED displays), computer chips, batteries. energy generation, supercapacitors, medical equipment, water filters, solar cells and more.

What are carbon nanotubes?

Carbon nanotubes (often abbreviated to CNTs) are cylindrically-shaped molecules made of carbon atoms. A sheet of graphene can be rolled-up to make a carbon nanotube. CNTs can be single-walled (SWCNT) if made from one layer of carbon atoms, or multi-walled (MWCNT) when consisting of several layers of graphene sheets. In fact, carbon nanotubes come in various diameters, lengths, and functional group content which can tailor their use for specific applications.

I think there are two reasons

1)Graphen discover in 2004 and CNT discover in 1991

2) electron mobility of graphene layers is more than that of MCNT due to their layered structures. However, CNTs are more robust than graphene sheets and suitable for mechanical reinforcement or flexible electronics.

I agree with Saleemsab Doddamani