Synthesis of ZnO nanoparticles-based fluorescent ink for information encryption and security applications

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2024-10-18 DOI:10.1016/j.optmat.2024.116296

Thanh Phuong Nguyen , Huu Phuc Dang , Long Giang Nguyen , Cong Danh Le

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Abstract

Luminescent ZnO nano pigments with a hexagonal structure were successfully synthesized using the hydrothermal method. The color fluorescent emission of ink can be tuned by hydrothermal conditions in the synthesis of pigment or by adjusting the pH values of the ink formulation. The ink formula based on luminescent ZnO nano pigments with a concentration of 15 % (w/w) was dispersed and homogenized in the vehicle, including water, PVA, and ethylene glycol. The stable ZnO nano ink formula has the zeta potential value of ξ = −24.8 mV at pH = 7.2, and ZnO pigments have an average particle size of about 500 nm in length and 90 nm in width. The logo samples printed on graphic paper and Couche paper with luminescent ink using a screen printing method show a bright yellow fluorescence at 565 nm under UV irradiation 365 nm and are invisible under normal light. The QR code on paper is readable by a smartphone under UV light. The ZnO nano ink is suitable for information encryption and anti-counterfeiting applications.

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合成基于氧化锌纳米颗粒的荧光墨水，用于信息加密和安全应用

利用水热法成功合成了具有六方结构的发光氧化锌纳米颜料。油墨的彩色荧光发射可以通过颜料合成过程中的水热条件或调节油墨配方的 pH 值来调节。将浓度为 15% (w/w) 的 ZnO 纳米发光颜料分散在水、PVA 和乙二醇等载体中并均质，得到了稳定的 ZnO 纳米油墨配方。稳定的 ZnO 纳米油墨配方在 pH = 7.2 时的 zeta 电位值为 ξ = -24.8 mV，ZnO 颜料的平均粒径长约 500 nm，宽约 90 nm。用丝网印刷方法在绘图纸和 Couche 纸上用发光油墨印刷的徽标样品在紫外线照射 365 纳米时，在 565 纳米处显示出明亮的黄色荧光，而在正常光线下则不可见。在紫外线照射下，智能手机可以读取纸上的二维码。氧化锌纳米油墨适用于信息加密和防伪应用。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.