期刊
RSC ADVANCES
卷 5, 期 29, 页码 22343-22349出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra16990e
关键词
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资金
- National Science Foundation of China [21174087, 21474079]
- Program for New Century Excellent Talents in University [NCET-13-0453]
- China Postdoctoral Science Foundation [2013M540738, 2014T70909]
- Fundamental Funds for the Central Universities [08142027, 08143101]
A facile but effective bottom-up method for the mass preparation of N-doped carbon dots (N-C-dots) was developed by the direct heating of a solid mixture of folic acid (FA) and sodium citrate (SC) for several minutes at 300 degrees C. The nitrogen content of the resulting N-C-dots could be easily and precisely tuned from 0% to 14% by adjusting the SC to FA mass ratio. Uniform N-C-dots with honeycomb-like ordered structures were obtained, with sizes ranging from 1 to 3 nm in diameter. The N-doping content affected not only the emission quantum yield but also the emission wavelength. The N-C-dots emitted strong blue-green fluorescence based on the excitation wavelength and N-doping content. Because of their excellent water solubility, low toxicity, powerful fluorescence, and high resistance to photobleaching, the N-C-dots can enter various cells and serve as ideal candidates for multicolour cell imaging.
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