Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 19, Issue 7, Pages 4058-4063Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2019.16332
Keywords
Nitrogen-Doped Carbon Dots; Citric Acid; Guanidine Carbonate; Fluorescence
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Funding
- National Natural Science Foundation of China [21573058, 21303044, 21173070]
- Program for Innovative Research Team in Science and Technology in University of Henan Province [15IRTSTHN 003, 17IRTSTHN 001]
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A facile one-pot hydrothermal method for fabricating nitrogen-doped carbon dots (N-CDs) was developed by using citric acid as a carbon source and guanidine carbonate as a nitrogen and carbon source. X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectra indicated that the N-CDs were rich in elemental nitrogen. They had excellent stability in the presence of various salt concentrations and under UV irradiation. The N-CDs exhibited high quantum yields (52%), as well as down-conversion and up-conversion photoluminescence. The N-CD photoluminescence was quenched in the presence of Hg2+, while nearly no intensity changes were observed when in the presence of Na+, Mg2+, Mn2+, Zn2+, Ni2+, Cu2+, Ba2+, Cd2+ or Ca2+. The binding constant (K-SV) and detection limit were also determined.
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