基于反乳相法制备的荧光量子点在防伪加密方面的应用  

Application of Fluorescence Quantum Dots Prepared by Inverse Emulsion Method in Anti-Counterfeiting Encryption

作　　者：张瑞 吕泽华 刘海运 师慧 闫奥 龚梦梦 武波亨 ZHANG Rui;LU Zehua;LIU Haiyun;SHI Hui;YAN Ao;GONG Mengmeng;WU Boheng(School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学应用科学学院,太原030024

出　　处：《华南师范大学学报（自然科学版）》2023年第6期1-8,共8页Journal of South China Normal University(Natural Science Edition)

基　　金：山西省自然科学基金项目(20210302123221,202203021221146,202103021224268,202203021222207);山西省科技创新人才团队专项资助项目(202204051001002)。

摘　　要：采用反乳相法制备了一种由聚合物包裹的钙钛矿量子点油墨,在由水相和油相相混合形成的反溶剂中,通过将钙钛矿量子点直接包覆在其中悬浮的聚合物内。形成的微小疏水性颗粒,均匀分散于水中的同时,在疏水性聚合物外壳层的包覆下,可以稳定悬浮于水溶剂中,有可能用于信息的加密处理。基于反乳相法将三种聚合物材料:聚甲基丙烯酸甲酯(PMMA)、聚苯乙烯树脂(PS)、聚乙烯吡咯烷酮(PVP)与卤化铅钙钛矿量子点相结合制备的卤化铅钙钛矿量子点油墨,在不同溶剂中表现出不同的光学特性及随时间衰减的稳定性。利用几种防伪油墨在不同溶剂下不同材料的时间衰减情况,可以对信息实现有效的时间维度上的加密和解密工程。成功设计了滤纸上的加密信息,在365 nm紫外灯照射下对信息进行安全加密和解密。A method was reported about synthesizing all inorganic perovskite quantum dots using inverse emulsion method.In an antisolvent formed by mixing water and oil phases,perovskite quantum dots are directly encapsulated in a polymer suspended in it.The tiny hydrophobic particles formed,which are uniformly dispersed in water,can be stably suspended in an aqueous solvent while being encapsulated in a hydrophobic polymer shell layer,and can potentially be used for cryptographic processing of information.The lead halide chalcogenide quantum dot inks,prepared using the inverse emulsion phase method,combine three polymer materials(PMMA,PS,and PVP)with lead halide chalcogenide quantum dots.Three inks exhibit varying optical properties and stability decay rates over time in different solvents.Effective encryption and decryption engineering of information in the time dimension can be achieved by utilizing the time decay of several anti-counterfeiting inks with different materials in different solvents.Finally,the encrypted information on filter paper was successfully designed to securely encrypt and decrypt the information under 365 nm UV lamp irradiation.

关 键 词：反乳相法 CsPbBr_(3)量子点 聚合物包覆 ASCII编码 加密 

分 类 号：O482.31[理学—固体物理]