Sn4+complexation with sulfonated-carbon dots in pursuit of enhanced fluorescence and singlet oxygen quantum yield
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2020-06-07
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Luo, Qinghua
Ding, Haizhen
Hu, Xiaolong
Xu, Jiahui
Sadat, Anwar
Xu, Mingsheng
Primo, Fernando Lucas [UNESP]
Tedesco, Antonio Claudio
Zhang, Haiyuan
Bi, Hong
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Here we report a novel strategy to crosslink the surface of sulfonated-carbon dots (S-CDs) by complexing SnCl4with 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 andin vitroPDT 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 higher1O2quantum yield.
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Dalton Transactions, v. 49, n. 21, p. 6950-6956, 2020.