Question

Which allotrope of carbon is considered a one-dimensional (1D) nanostructure?

• A. Graphene
• B. Carbon Nanotube
• C. Fullerene
• D. Diamond

Hint:

0D → Fullerene
1D → Carbon Nanotube
2D → Graphene
3D → Diamond

Answer 1

The Correct Option is B

Concept:
Carbon exists in several structural forms known as allotropes. These allotropes differ in the arrangement of carbon atoms and their dimensional structure. In nanotechnology, carbon nanostructures are often classified based on their dimensionality:

• 0D nanostructures – Fullerene (C$_{60}$)
• 1D nanostructures – Carbon nanotubes
• 2D nanostructures – Graphene
• 3D structures – Diamond and graphite

Step 1:Understanding one-dimensional nanostructures.
A one-dimensional (1D) nanostructure has one dimension that is significantly longer than the other two, giving it a wire-like or tubular shape. Electrons primarily move along one axis.
Step 2:Structure of carbon nanotubes.
Carbon nanotubes (CNTs) are cylindrical nanostructures formed by rolling a graphene sheet into a tube. They have diameters in the nanometer range but can be several micrometers long, making them ideal examples of 1D nanostructures.
Step 3:Eliminating other options.}

• Graphene – A two-dimensional sheet of carbon atoms.
• Fullerene – A zero-dimensional spherical molecule.
• Diamond – A three-dimensional crystalline structure.

Conclusion:
Therefore, the carbon allotrope considered a one-dimensional (1D) nanostructure is the carbon nanotube.