Hydrophilic Doped Quantum Dots "Ink" and Their Inkjet-Printed Patterns for Dual Mode Anticounterfeiting by Reversible Cation Exchange Mechanism
Hydrophilic Doped Quantum Dots "Ink" and Their Inkjet-Printed Patterns for Dual Mode Anticounterfeiting by Reversible Cation Exchange Mechanism
复制标题
亲水掺杂量子点“墨水”及其喷墨印刷图案用于可逆阳离子交换机制的双模式防伪
DOI：
10.1002/adfm.201808762
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发表时间：
2019-04-25
影响因子：
19
通讯作者：
Zhang, Jiatao
中科院分区：
文献类型：
--
作者：
Huang, Wenyi;Xu, Meng;Zhang, Jiatao
发光量子点图案在防伪方面的应用引起了人们的极大关注，因为它们可以在激发时发出荧光。不同于传统的用于防伪的发光模式，本文报道了一种基于可逆阳离子交换使能的掺银硫化镉量子点(CDS：Ag量子点)的新型防伪策略。首先，揭示了阳离子交换使能掺杂量子点晶体工程的可逆性。通过这种机制实现了从无发光到发光的几个周期的切换。其次，通过表面修饰制备亲水掺杂的量子点墨水，然后通过喷墨打印技术在不同的基材上打印柔性的大尺寸图案，如羊皮纸、PET箔、纸币基材等。第三，由于CdS：Ag量子点晶体结构稳定的特点，可以通过原位阳离子交换来切换这种掺杂量子点在衬底上的图案，实现发光信号消失和恢复的转换，从而提供多重双模防伪验证。
Luminescent quantum dots (QDs) patterns have attracted great attention in anticounterfeiting applications because they can emit fluorescence upon excitation. Here, different from traditional luminescent patterns for anticounterfeiting purposes, a novel strategy based on the reversible cation exchange enabled Ag doped CdS quantum dots (CdS:Ag QDs) is reported to provide a higher security for anticounterfeiting. First, the reversibility of cation exchange enabled doped QDs crystal engineering have been revealed. The switch from nonluminescence to luminescence for several cycles by such a mechanism has been achieved. Second, the hydrophilic doped QDs "ink" can be prepared by surface modification, and then flexible bulk-sized patterns can be printed on different substrates by inkjet printing technology, such as the parchment paper, PET foil, and paper currency substrates. Third, owing to the characteristic of stable crystal structure of CdS:Ag QDs, the patterns of such doped QDs on substrates can be switched by in situ cation exchange to achieve conversion of the disappearance and recovery of luminescent signals, from which a multiple dual mode anticounterfeiting verification can be provided.