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Issue 23, 2013
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Modulation and effects of surface groups on photoluminescence and photocatalytic activity of carbon dots

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Abstract

To demonstrate the effects of surface atoms on photoluminescence (PL) and photocatalytic activities of luminescent carbon dots (CDs), we design and tailor the surface groups of CDs with heteroatoms by a facile and effective approach. The coexistence of O and N radicals in CDs results in strong PL while CDs containing O and Cl radicals show high photocatalytic activity. This is attributed to the different degrees and directions of energy band bending from inner to surface induced by O, N, and Cl radicals at the surface of CDs. The coexistence of both upward and downward band bending that are caused by the O and Cl radicals, respectively, in CDs is similar to an internal electronic field that facilitates the separation of electron–hole pairs and carrier migration, leading to high photocatalytic activity. These results may also be used for designing and tailoring optical–electronic properties of carbon nanostructures.

Graphical abstract: Modulation and effects of surface groups on photoluminescence and photocatalytic activity of carbon dots

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Article information


Submitted
27 Jul 2013
Accepted
11 Sep 2013
First published
16 Sep 2013

Nanoscale, 2013,5, 11665-11671
Article type
Paper

Modulation and effects of surface groups on photoluminescence and photocatalytic activity of carbon dots

S. Hu, R. Tian, Y. Dong, J. Yang, J. Liu and Q. Chang, Nanoscale, 2013, 5, 11665
DOI: 10.1039/C3NR03893A

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