Invisible Security Ink Based on Water-Soluble Graphitic Carbon Nitride Quantum Dots

Angewandte Chemie
Zhiping SongLiangqia Guo

Abstract

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.

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Citations

May 6, 2016·ACS Applied Materials & Interfaces·Tiance AnGengfeng Zheng
May 18, 2017·Advanced Materials·Guoying BaiJianjun Wang
Feb 18, 2016·Angewandte Chemie·Qianling CuiMenny Shalom
Nov 15, 2018·Chemical Communications : Chem Comm·Zhixiang JiangPing Yang
Dec 12, 2018·Methods and Applications in Fluorescence·Mohammadreza Khodabakhsh, Ugur Unal
Dec 5, 2019·Nanoscale·Houjuan ZhuDavid Tai Leong
Apr 15, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Rachna Devi, Sivakumar Vaidyanathan
Nov 30, 2019·Chemical Communications : Chem Comm·Zesheng ZhuoYongqiang Dong
Feb 15, 2020·Chemical Science·Jennifer YuanMichael O Wolf
Sep 10, 2016·Small·Yongqiang DongHuang-Hao Yang
Jan 19, 2018·Chemical Communications : Chem Comm·Lijuan ShenLilong Jiang
Sep 5, 2019·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Hongji LiuRongrong Nie

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