Journal
MICROCHIMICA ACTA
Volume 185, Issue 11, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-018-3045-6
Keywords
Carbon dots; N,S-co-doping; Solvothermal method; Photoluminescence; Green emission; Metal ions; Solvents; Dual ions detection; Fluorescent probe; Color change
Categories
Funding
- National Natural Science Foundation of China [51673060, 11574075, 21603067, 21401049, 51503156]
- Ministry of Science and Technology of China [2016YFA0200200]
- Hubei Provincial Department of Science Technology [2015CFB266, 2016CFB199]
- Natural Science Fund for Distinguished Young Scholars of Hubei Province, China [2016CFA036]
- Hubei Provincial Department of Education [Q20161010, D201602]
- Health Family Planning Commission of Wuhan Municipality [WX18B15]
- National Key R&D Program of China [2018YFB1105100]
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N,S-co-doped carbon dots (N,S-CDs) were synthesized via a single-step solvothermal process by using sodium lignosulfonate and p-phenylenediamine as carbon/nitrogen/sulfur sources. The N,S-CDs have an average diameter of 2.021nm and display green fluorescence, with excitation/emission peak wavelengths at 380/540nm for optimal fluorescence. Fluorescence is excitation wavelength-dependent and stable in aqueous salt solutions. The fluorescence of the N,S-CDs is selectively quenched by Fe(III) and Ag(I) ions. These ions can be quantified by fluorometry with a limit of detection of 1.7M for Fe(III) ions and 11.6M for Ag(I) ions. The N,S-CDs also undergo solvatochromism in that emission is green in water solution but blue in polar organic solvents such as ethanol or N,N-dimethylformamide. The color of fluorescence gradually shifts from green to blue when continuously increasing the fraction of organic solvent in water.
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