Journal
RSC ADVANCES
Volume 7, Issue 76, Pages 48386-48393Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra09785a
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Funding
- National Natural Science Foundation of China [21401113, 21575032]
- Natural Science Foundation of Henan Department of Science Technology [172102310668]
- Natural Science Foundation of Nanyang Normal University [ZX2014043]
- scientific research and service platform fund of Henan Province [2016151]
- fund scientific and technological innovation team of water ecological security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province [17454]
- Fundamental Research Funds for the Central Universities [PYBZ1707, buctrc201607]
- Open Ground from State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan University
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Nitrogen and boron doped carbon quantum dots (NB-CQDs) with yellow-green emission were prepared via hydrothermal method using 2-hydroxyphenylboronic acid and ethylenediamine in aqueous solution. The as-prepared NB-CQDs exhibited bright yellow-green emission, excellent stability in aqueous solution with high ionic strength and good biocompatibility. We further explored the applications of NB-CQDs for sensing metal ions in aqueous solution. We found that the NB-CQDs could be utilized to sense Cr2O72- in aqueous solution due to the Cr2O72- -induced fluorescence quenching. In the sensing system, as low as 0.5 mu M Cr2O72- can be successfully detected and a good linear relationship in the range of 0-250 mu M has been obtained. And the NB-CQDs can be also used as ink for writing on paper, revealing the NB-CQDs can be applied for anti-counterfeiting. Moreover, the NB-CQDs exhibit negligible cytotoxicity and good biocompatibility, which is favorable for bioimaging applications. And the NB-CQDs were successfully applied for fluorescence imaging in HeLa cells.
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