期刊
JOURNAL OF MATERIALS CHEMISTRY B
卷 3, 期 4, 页码 700-706出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tb01643b
关键词
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资金
- National Basic Research Program [2015CB931801]
- National Natural Science Foundation of China [21374062, 21376087, 51203089, 20104049, 51373099]
- Open Project of State Key Laboratory of Chemical Engineering [SKL-ChE-12C04]
Amorphous carbon dots (C-Dots) with high two-photon fluorescence were prepared by using citric acid (CA) as the carbon source and hyperbranched poly(amino amine) (HPAA) as the surface passivation agent through a facile hydrothermal approach. The C-Dots with an average diameter about 10 nm were readily dispersed in water. They exhibited excellent fluorescence properties and excitation-dependent fluorescence behavior with the corresponding quantum yield (QY) of 17.1% in aqueous solution. Interestingly, the C-Dots emitted bright fluorescence even in the solid state with a QY of 16.3%, which is the highest value obtained for carbon-based nanomaterials. Using the MTT assay, the C-Dots showed low cytotoxicity against L929 normal cells. Furthermore, they were easily internalized by HeLa cells and presented high quality one-and two-photon cellular imaging, suggesting significant potential for application in biological imaging.
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