期刊
CARBON
卷 66, 期 -, 页码 351-360出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2013.09.010
关键词
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资金
- Chinese 973 Program [2011CB933600]
- National Science Fund for Distinguished Young Scholars of China [21225313]
- National Natural Science Foundation of China [21203035]
- Large-scale Instrument And Equipment Sharing Foundation of Wuhan University
- Fundamental Research Funds for the Central University [2012203020203]
Phosphate functionalized carbon nanodots (C-dots) with satisfactory quantum yield have been prepared through one-step acidic oxidation of sucrose by H3PO4 at low temperature (60 degrees C). The as-prepared C-dots are monodisperse with narrow size distribution. Besides, two C-dots emitting different colors, namely green and yellow, can be easily separated by collecting the supernatant and precipitate after neutralization and centrifugation. Both C-dots show good photoluminescence properties over a very wide pH range (2.0-13.0). Moreover, they exhibit high tolerance to various external conditions, such as high ionic strength, external cations and UV excitation. The obtained C-dots can be internalized by cells without post surface passivation and they exhibit minimum toxicity as well as favorable biocompatibility. The highly stable, phosphate functionalized and two color C-dots with narrow size distribution are expected to have great potential application in bioimaging and bioanalysis. (C) 2013 Elsevier Ltd. All rights reserved.
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