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Wednesday, 18 September 2019
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Raw materials & technologies, Technologies

New invisible security inks for high-level information coding

Friday, 29 January 2016

New research results provide innovative opportunities for high-level information coding and protection by using water-soluble graphitic carbon nitride quantum dots (g-CNQDs) as invisible security inks.

Traditional fluorescent inks are limited in maintaining the secrecy of information. Source: knipseline/pixelio.de

Traditional fluorescent inks are limited in maintaining the secrecy of information. Source: knipseline/pixelio.de

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.

Invisible in ambient light and UV light

Chinese researchers have 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.

The study is published in: Angewandte Chemie.

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