Journal
NANOSCALE
Volume 9, Issue 2, Pages 491-496Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr07123f
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Funding
- Research Equipment Development Project of Chinese Academy of Sciences [YZ201562]
- Youth Innovation Promotion Association CAS [2013150]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20030300]
- National Natural Science Foundation of China [51502285, 21521092, 21590794, 21210001]
- National Key Basic Research Program of China [2014CB643802]
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High quantum yields (QY) and stable performances are prerequisites for implementing carbon dots in practical applications. In this study, we demonstrate that nitrogen-doped carbon dots (N-CDs), which were prepared via the hydrothermal treatment of citric acid (CA) and tris(hydroxymethyl) methyl aminomethane (Tris), have a high QY of 75%, together with excellent thermal and photo stability. These N-CDs deliver an excellent thermal stability performance over the temperature range of 25 degrees C to 95 degrees C, and even at a heating temperature of 90 degrees C for 360 min. Upon exposure to UV illumination with a radiant intensity of 20 mW cm(-2), 96% fluorescence intensity is retained. This florescence stability performance is probably due to the chemical composition and steric effect of the nitrogen-doping agent. Furthermore, the remarkable optical properties of these N-CDs allow them to be used as invisible ink for loading important information and advanced anticounterfeiting.
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