Dual-Mode Encoded Magnetic Composite Microsphere Based on Fluorescence Reporters and Raman Probes as Covert Tag for Anticounterfeiting Applications
Dual-Mode Encoded Magnetic Composite Microsphere Based on Fluorescence Reporters and Raman Probes as Covert Tag for Anticounterfeiting Applications
复制标题
基于荧光报告基团和拉曼探针的双模式编码磁性复合微球作为防伪应用的隐蔽标签
DOI：
10.1021/acsami.6b02359
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发表时间：
2016-04-13
影响因子：
9.5
通讯作者：
Wang, Changchun
中科院分区：
文献类型：
--
作者：
Li, Ruimin;Zhang, Yuting;Wang, Changchun
利用荧光报告分子和表面增强拉曼散射（Sers）探针作为防伪标记，设计并制备了一系列微米级的双模编码磁性复合微球。首先采用沉淀聚合法制备了微米级的三聚氰胺甲醛荧光微球（FMF），然后在FMF微球表面直接固定磁性纳米粒子（MNP）制备了磁性复合微球（FMF/MNP）。将Ag纳米粒子（Ag-NPs）沉积到FMF/MNP微球上，然后将Sers探针吸附到Ag-NPs表面，再用Stober法在复合微球表面包覆一层SiO2保护层。不同荧光报告分子与Sers探针的组合大大增加了高水平防伪的编码复杂性和体积。采用场发射扫描电镜（FESEM）、透射电镜（TEM）、荧光光谱仪（FLS）、X射线衍射仪（XRD）、振动样品磁强计（VSM）、紫外可见光谱仪（UV-vis）和能谱仪（EDS）对复合微球的结构进行了表征。嵌入的磁性纳米颗粒使复合微球能够在低至1 ppm的浓度下通过磁体从标记的乳胶漆中快速分离，并且即使从一个复合微球也可以读出隐藏的标签信息。此外，标记的涂膜中的隐蔽安全信息也可以原位读出，并且复合微球的存在不影响涂膜的可见外观。所有上述突出的性能将使这些双模编码复合微球作为先进的安全标签，为下一代防伪应用。
Utilizing fluorescence reporters and SERS probes as the security labels, a series of dual-mode encoded magnetic composite microspheres with micrometer size was designed and prepared for anticounterfeiting applications. At first, the micro-meter-sized melamine formaldehyde micro spheres with different fluorescence molecules (FMF) were prepared by precipitation polymerization, and then the magnetite composite microspheres (FMF/MNPs) were fabricated by direct immobilization of magnetic nanoparticles (MNPs) onto the surface of FMF microspheres. After deposition of Ag nanoparticles (Ag-NPs) onto FMF/MNPs microspheres, the SERS probes were absorbed onto the surface of Ag-NPs, and then a protection layer of silica was coated on the composite microspheres by Stober method. The combination of different fluorescence reporters and SERS probes greatly increased the encoding complexity and volume for high-level anticounterfeiting. The structure of the dual-encoded FMF/MNPs/Ag-NPs/SiO2 composite microspheres was characterized by FESEM, TEM, FLS (fluorescence spectrometer), XRD, VSM, UV-vis and EDS. The embedded magnetic nanoparticles enable the composite microspheres to be quickly isolated from the marked latex paint by magnet at the concentration of as low as 1 ppm, and the covert tag information can be read out even from one composite microsphere. In addition, the covert security information in the marked coating film can be also read out in situ and the existence of the composite microspheres does not influence the visible appearance of the coating film. All the above outstanding properties will make these dual-mode encoded composite microspheres as advanced security tags for next-generation anticounterfeiting applications.