Which of the following nano structures includes nanotubes as an example?

Step-by-step solution

Nanomaterials are classified based on the number of dimensions that are outside the nanoscale range (greater than 100 nm). Zero-dimensional (0D) nanomaterials have all three dimensions in the nanoscale. Examples include quantum dots and nanoparticles. One-dimensional (1D) nanomaterials have two dimensions in the nanoscale and one dimension outside the nanoscale. Examples include nanotubes, nanowires, and nanorods. Two-dimensional (2D) nanomaterials have one dimension in the nanoscale and two dimensions outside the