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Synthesis of fluorescent polymeric carbon nitride quantum dots in molten salts for security inks

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Abstract

Polymeric carbon nitride quantum dots (CNQDs) with an average size of approximately 2.5 nm were prepared directly from melamine via a one-step molten salt method. The formation mechanism and photoluminescence (PL) properties of the resulting CNQDs were investigated by means of TEM, XRD and PL spectroscopy. The CNQDs can be dispersed in water to form a transparent colloidal solution and emit blue PL with excellent photostability. Interestingly, upon addition of CuCl2 and NaHCO3 in turn, the PL of CNQDs can be turned off and on accordingly. Taking advantage of the on–off–on PL response, the CNQDs can be used as a fluorescent security ink for information coding, encryption and decryption, indicating their promising application in data security and high-level anti-counterfeiting fields.

Graphical abstract: Synthesis of fluorescent polymeric carbon nitride quantum dots in molten salts for security inks

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Publication details

The article was received on 09 Sep 2017, accepted on 26 Oct 2017 and first published on 27 Oct 2017


Article type: Paper
DOI: 10.1039/C7NJ03423G
Citation: New J. Chem., 2017, Advance Article
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    Synthesis of fluorescent polymeric carbon nitride quantum dots in molten salts for security inks

    Y. Wang, J. Wang, P. Ma, H. Yao, L. Zhang and Z. Li, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ03423G

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