Discussion
Match the material with its dimensionality.
1. Quantum dot 2. Carbon nanotube 3. Graphene
P. One dimensional Q. Zero dimensional R. Two dimensional
Answer: B
Correct answer: 1-Q, 2-P, 3-R
The dimensionality counts the directions in which carriers are free to move. A quantum dot confines them in all three, so it is zero-dimensional and has discrete atom-like levels. A nanotube leaves one direction free and is one-dimensional. Graphene leaves two free and is two-dimensional.
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