Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 8, Pages 2773-2777Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201510945
Keywords
carbon nitride; data security; fluorescence; fluorescent ink; semiconductors
Categories
Funding
- NSFC [21577017, 21425309]
- National Basic Research Program of China [2013CB632405]
- Program for New Century Excellent Talents in Fujian Province University
- Science and Technology Project of Fujian Province, China [2015Y0045]
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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 watersoluble 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.
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