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Invisible Security Ink Based on Water‐Soluble Graphitic Carbon Nitride Quantum Dots
Author(s) -
Song Zhiping,
Lin Tianran,
Lin Lihua,
Lin Sen,
Fu Fengfu,
Wang Xinchen,
Guo Liangqia
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201510945
Subject(s) - graphitic carbon nitride , quantum dot , encryption , fluorescence , photoluminescence , carbon quantum dots , nanotechnology , naked eye , carbon fibers , materials science , chemistry , computer science , optoelectronics , computer security , physics , optics , composite number , catalysis , organic chemistry , photocatalysis , composite material
Stimuli‐responsive photoluminescent (PL) materials have been widely used as fluorescent ink for data security applications. However, traditional fluorescent inks are limited in maintaining the secrecy of information because the inks are usually visible by naked eyes either under ambient light or UV‐light illumination. Here, we introduced metal‐free water‐soluble graphitic carbon nitride quantum dots (g‐CNQDs) as invisible security ink for information coding, encryption, and decryption. The information written by the g‐CNQDs is invisible in ambient light and UV light, but it can be readable by a fluorescence microplate reader. Moreover, the information can be encrypted and decrypted by using oxalic acid and sodium bicarbonate as encryption reagent and decryption reagent, respectively. Our findings provide new opportunities for high‐level information coding and protection by using water‐soluble g‐CNQDs as invisible security ink.