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Sn4+ complexation with sulfonated-carbon dots in pursuit of enhanced fluorescence and singlet oxygen quantum yield

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Abstract

Here we report a novel strategy to crosslink the surface of sulfonated-carbon dots (S-CDs) by complexing SnCl4 with sulfonate groups (–SO3) on the CDs in aqueous solution. The S-CDs show an average photoluminescence (PL) quantum yield of 21% and a mean diameter of 3.8 nm. After being complexed with Sn4+, the as-obtained Sn@S-CDs present a reduced size of 1.8 nm and a higher PL quantum yield of 32%. More interestingly, the Sn@S-CDs show an enhanced singlet oxygen (1O2) quantum yield as high as 37% compared to that of the S-CDs (27%). In the HepG2 cell line as a model, the Sn@S-CDs exhibit a remarkable cell imaging effect and in vitro PDT efficiency. Therefore, our study proposes a simple but effective cross-linking strategy to synthesize CDs incorporated with metal ions, for the purpose of achieving an enhanced fluorescence intensity and a higher 1O2 quantum yield.

Graphical abstract: Sn4+ complexation with sulfonated-carbon dots in pursuit of enhanced fluorescence and singlet oxygen quantum yield

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Supplementary files

Article information


Submitted
30 Mar 2020
Accepted
22 Apr 2020
First published
22 Apr 2020

Dalton Trans., 2020, Advance Article
Article type
Communication

Sn4+ complexation with sulfonated-carbon dots in pursuit of enhanced fluorescence and singlet oxygen quantum yield

Q. Luo, H. Ding, X. Hu, J. Xu, A. Sadat, M. Xu, F. L. Primo, A. C. Tedesco, H. Zhang and H. Bi, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT01187H

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