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Se & N Co-doped Carbon Dots for High-performance Fluorescence Imaging Agent of Angiography

Abstract

Both long wavelength excitation and emission are highly desired for fluorescent carbon dots in the bio-related applications. According to semiconductor theory, heteroatom doping is an effective way to tune the band gap of semiconductor. In this work, we developed an exceedingly simple and mild one-pot method to synthesize selenium and nitrogen co-doped carbon dots (Se&N-CDs) by using low cost citric acid, ethane diamine and selenium powder as the starting materials. After doping Se element into N-CDs, the absorption of Se&N-CDs have been expanded from UV to visible light region (~ 497 nm), as well as. The more important is that Se&N-CDs show strong green light emission with high quantum yield of ~ 52%, attributing to the new Se-state introduced in the Se&N-CDs due to low electronegativity of Se. Furthermore, we successfully demonstrate that Se&N-CDs have excellent performance as a dye for fluorescein fundus angiography (FFA). After injection a clear vascular image in the retina and detailed images of the capillary bed were exhibited in the FFA image. That will provide a great advantage for the bio-imaging and diagnosis.

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Publication details

The article was received on 30 Mar 2017, accepted on 15 May 2017 and first published on 15 May 2017


Article type: Paper
DOI: 10.1039/C7TB00875A
Citation: J. Mater. Chem. B, 2017, Accepted Manuscript
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    Se & N Co-doped Carbon Dots for High-performance Fluorescence Imaging Agent of Angiography

    D. Qu, X. Miao, X. Wang, C. Nie, Y. Li, L. Luo and Z. Sun, J. Mater. Chem. B, 2017, Accepted Manuscript , DOI: 10.1039/C7TB00875A

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