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If carbon nanotubes (CNTs) have the size required to have an bound electron energy state, why don't CNTs behave like quantum dots, such as having optical tunability, amongst other properties?

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    $\begingroup$ What is optical tenability? What other properties you are looking for? Also, have you considered that nanobutes are 1D while quantum dots are 0D structures? $\endgroup$
    – Greg
    Commented Jul 4, 2021 at 8:20
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    $\begingroup$ But somehow they do. It is like asking why a molecule is not a quantum dot. It is, and a very small one. What is more quantum dot than a polyene? $\endgroup$
    – Alchimista
    Commented Jul 6, 2021 at 7:40

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Carbon nanotubes are 1-d materials which are confined in 2 dimensions. You cannot compare it with quantum dots which show confinement in 3 dimensions.The difference in optical properties maybe be primarily due to the very small size and 3-D confinement of quantum dots.

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    $\begingroup$ If anything, QDs are 0D, not 3D. Sorry, I don't find this answer to be convincing or comprehensive. $\endgroup$
    – andselisk
    Commented Jul 9, 2021 at 11:31
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    $\begingroup$ @Isaac said that the confinement is 3D (ie the structure is a 0D) $\endgroup$
    – Greg
    Commented Jul 9, 2021 at 14:00

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