Fabrication of Anticounterfeiting Nanocomposites with Multiple Security Features via Integration of a Photoresponsive Polymer and Upconverting Nanoparticles,Advanced Functional Materials

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Fabrication of Anticounterfeiting Nanocomposites with Multiple Security Features via Integration of a Photoresponsive Polymer and Upconverting Nanoparticles
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-06-29 , DOI: 10.1002/adfm.202103908
Yazhi Liu _{1,

2} , Shuofeng Liang ₁ , Chenrui Yuan ₁ , Andreas Best ₂ , Michael Kappl ₂ , Kaloian Koynov ₂ , Hans‐Jürgen Butt ₂ , Si Wu ₁

Affiliation

Anticounterfeiting materials are used to distinguish real banknotes, products, and documents from counterfeits, fakes, or unauthorized replicas. However, conventional anticounterfeiting materials generally exhibit a single anticounterfeiting function, resulting in a low level of security. Herein, a novel anticounterfeiting nanocomposite is demonstrated with numerous prominent security features. The nanocomposite is fabricated by doping upconverting nanoparticles (UCNPs) in a photoresponsive azobenzene-containing polymer (azopolymer). Because of the cis–trans photoisomerization of the azopolymer, the nanocomposite exhibits photoinduced reversible color changes suitable for anticounterfeiting applications. Additionally, the hard nanocomposite can be converted to a rubber-like soft solid by light irradiation. Imprinted microstructures are fabricated on the photosoftened nanocomposite, which result in photonic colors. Moreover, polarization-dependent structures are fabricated on the nanocomposite via photoinduced orientation for encryption. Importantly, UCNPs in the nanocomposite emit visible light upon excitation by near-infrared light, enabling the observation of various anticounterfeiting structures with high contrast. An advantage of the anticounterfeiting nanocomposite is that the security features can be observed by the naked eye for quick discrimination and can be analyzed using laboratory equipment for higher accuracy. The anticounterfeiting nanocomposite is easily processed on paper, glass, and plastic, which demonstrates its potential anticounterfeiting functions for banknotes, wines, and medicines.

中文翻译：

通过集成光响应聚合物和上转换纳米颗粒制备具有多重安全特性的防伪纳米复合材料

防伪材料用于区分真实的钞票、产品和文件与伪造、赝品或未经授权的复制品。然而，传统的防伪材料通常具有单一的防伪功能，安全性较低。在此，展示了一种具有众多突出安全特征的新型防伪纳米复合材料。该纳米复合材料是通过在光响应性含偶氮苯聚合物（偶氮聚合物）中掺杂上转换纳米粒子 (UCNP) 来制造的。因为顺-反偶氮聚合物的光异构化，纳米复合材料表现出光诱导的可逆颜色变化，适用于防伪应用。此外，硬纳米复合材料可以通过光照射转化为橡胶状软固体。在光软化的纳米复合材料上制造印迹微结构，从而产生光子颜色。此外，通过光致取向在纳米复合材料上制造偏振相关结构以进行加密。重要的是，纳米复合材料中的 UCNP 在被近红外光激发后会发出可见光，从而能够以高对比度观察各种防伪结构。防伪纳米复合材料的一个优点是可以通过肉眼观察防伪特征以进行快速鉴别，并且可以使用实验室设备进行分析以获得更高的准确度。这种防伪纳米复合材料很容易在纸、玻璃和塑料上加工，展示了其对钞票、葡萄酒和药品的潜在防伪功能。

更新日期：2021-06-29

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