Journal
OPTICAL MATERIALS
Volume 77, Issue -, Pages 48-54Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2018.01.005
Keywords
Carbon nanodots; Supramolecules; Photoluminescence; Exitation dependence; Sensitiviy
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Funding
- National Natural Science Foundation of China [51403051, 21502042, 21403127, 21403151]
- Key Project of the Education Department of Henan Province [16A150003]
- Science and Technology Development Program of Henan Province of China [162102210023, 142300410122]
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Herein, we reported the characterization of a highly fluorescent and sensitive amorphous nanodots synthesized by hydrothermal treatment of citric acid in the presence of various beta-amines below 200 degrees C. Five-membered ring fused 2-pyridone compounds are effectively produced in the condensation reaction, and serve as the main building blocks to self-assemble into supramolecular nanodots under hydrogen bonding. The 2-pyridone compounds are not the sole blue species, but effectively enhance the photoluminescence quantum yield of citric acid derived nanodots. Compared with the excitation-independent emission in dilute solution, the dense nanodots exhibit red-shifted, suppressed and unexpected excitation-dependent emission. Moreover, the supramolecular nanodots have high sensitivity in various ambient conditions, such as pH, solvent polarity and metal ions. (C) 2018 Elsevier B.V. All rights reserved.
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