Mao Xiang, Zhao Xia, Hu Hao, Li Zequan, Xiong Wei, Wei Yujiao, Gao Wei
School of Resources, Environment and Materials, Guangxi University, Nanning 530004, Guangxi, China; Guangxi Engineering and Technology Research Center for High Quality Structural Panels from Biomass Wastes, Nanning 530004, Guangxi, China; State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, Guangxi, China.
School of Resources, Environment and Materials, Guangxi University, Nanning 530004, Guangxi, China; Guangxi Engineering and Technology Research Center for High Quality Structural Panels from Biomass Wastes, Nanning 530004, Guangxi, China; State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, Guangxi, China; Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, Guangxi, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2023 Dec 15;303:123257. doi: 10.1016/j.saa.2023.123257. Epub 2023 Aug 12.
Work to combat counterfeiting has always been crucial to defending the interests of the public. The usual anti-counterfeiting marks are now fundamental and easy to imitate. Therefore, it is more beneficial to anti-counterfeiting work to develop an anti-counterfeiting mark with more variations to make forgery more difficult. Due to its exceptional stability and fluorescence variability, carbon dots (CDs), a newly developed fluorescent material, offer a wide range of potential applications in anti-counterfeiting. However, there currently needs to be more CD applications in multi-level anti-counterfeiting, and additional issues include high cost and environmental contamination. Therefore, considering the problems of green environmental protection and cost, CDs with excellent green (530 nm) and blue (475 nm, 486 nm) luminescence properties were prepared by a one-step reaction of m-phenylenediamine and glucose. The average fluorescence lifespan is longer than 5 ns, and the optimal quantum yield can reach 37%. Due to the large number of protonated amino groups and surface carboxyl functional groups, the prepared carbon dots exhibit green and blue fluorescence emission modes under acidic and alkaline conditions, respectively. Based on this situation, we produced CD ink and successfully used it for multi-level anti-counterfeiting.
打击假冒伪劣的工作对于维护公众利益一直至关重要。常见的防伪标识如今已基本且易于模仿。因此，开发具有更多变化的防伪标识以使伪造更困难，对防伪工作更有益。作为一种新开发的荧光材料，碳点（CDs）因其卓越的稳定性和荧光可变性，在防伪领域具有广泛的潜在应用。然而，目前CDs在多级防伪中的应用还不够多，其他问题还包括成本高和环境污染。因此，考虑到绿色环保和成本问题，通过间苯二胺和葡萄糖的一步反应制备了具有优异绿色（530nm）和蓝色（475nm、486nm）发光特性的碳点。平均荧光寿命超过5ns，最佳量子产率可达37%。由于大量的质子化氨基和表面羧基官能团，制备的碳点分别在酸性和碱性条件下呈现绿色和蓝色荧光发射模式。基于这种情况，我们制备了CD油墨并成功将其用于多级防伪。
