Covalently bonding groups to the walls of carbon nanotubes has been previously observed to quench their photoluminescence. Now, it has been shown that, if you get the chemistry just right, their photoluminescence can in fact be significantly brightened by introducing defects through functionalization.
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Wang, Q., Strano, M. A bright future for defects. Nature Chem 5, 812–813 (2013). https://doi.org/10.1038/nchem.1768
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DOI: https://doi.org/10.1038/nchem.1768
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