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Se & N co-doped carbon dots for high-performance fluorescence imaging agent of angiography

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Abstract

Both long wavelength excitation and emission are highly desired for fluorescent carbon dots in bio-related applications. According to semiconductor theory, heteroatom doping is an effective way to tune the band gap of a 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 the Se element into N-CDs, the absorption of Se&N-CDs was expanded from UV to the visible light region (∼497 nm). More important is that the Se&N-CDs show a strong green light emission with a high quantum yield of ∼52%, attributed to the new Se-state introduced in the Se&N-CDs due to the low electronegativity of Se. Furthermore, we successfully demonstrate that Se&N-CDs have an 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. This will provide a great advantage for bio-imaging and diagnosis.

Graphical abstract: Se & N co-doped carbon dots for high-performance fluorescence imaging agent of angiography

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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, Advance Article
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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, Advance Article , DOI: 10.1039/C7TB00875A

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