What is the difference between carbon nanotubes and graphene?

A carbon nanotube is a thin film of carbon atoms rolled like a cylinder or a 3D tube, whereas graphene is a thin single-layer 2D film of carbon atoms. This is the main difference between carbon nanotubes and graphene. You can read about Nanotechnology in India – Origins, Uses, Developments in the given link.

Further readings:

1. Nano Mission – UPSC Nanotechnology Notes for Science & Technology
2. Science & Technology Notes For UPSC – General Science Notes