Journal
ANALYTICA CHIMICA ACTA
Volume 861, Issue -, Pages 74-84Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2014.12.045
Keywords
Nitrogen-doped carbon dots; Chitosan; EDA; Fe3+ detection; Cell image
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Funding
- Hundred Talent Programme of Shanxi Province
- HKBU Faculty Research Grant [FRG1/13-14/039]
- National Science Foundation of China [21175086, 21175087]
- Special Equipment Grant from the University Grants Committee of the Hong Kong Special Administrative Region, China [SEG_HKBU06]
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A fast and facile approach to synthesize highly nitrogen (N)-doped carbon dots (N-CDs) by microwave-assisted pyrolysis of chitosan, acetic acid and 1,2-ethylenediamine as the carbon source, condensation agent and N-dopant, respectively, is reported. The obtained N-CDs are fully characterized by elemental analysis, transmission electron microscopy, high-resolution transmission electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction pattern, X-ray photoelectron spectroscopy, UV-vis absorption, and photoluminescence spectroscopy. Doping N heteroatoms benefits the generation of N-CDs with stronger fluorescence emission. As the emission of N-CDs is efficiently quenched by Fe3+, the as-prepared N-CDs are employed as a highly sensitive and selective probe for Fe3+ detection. The detection limit can reach as low as 10 ppb, and the linear range is 0.010-1.8 ppm Fe3+. The as-synthesized N-CDs have been successfully applied for cell imaging and detecting Fe3+ in biosystem. (C) 2014 Elsevier B.V. All rights reserved.
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