Solid silica nanoparticles as carriers of fluorescent squaraine dyes in aqueous media: Toward a molecular engineering approach
Solid silica nanoparticles as carriers of fluorescent squaraine dyes in aqueous media: Toward a molecular engineering approach
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DOI：
10.1016/j.colsurfa.2019.01.052
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发表时间：
2019-05-05
影响因子：
5.2
通讯作者：
Martra, Gianmario
中科院分区：
文献类型：
--
作者：
Alberto, Gabriele;Barbero, Nadia;Martra, Gianmario
采用反相微乳液技术制备了尺寸极其均匀（50 +/- 2 nm）且在光学组织窗口中具有光致发光发射的杂化方酸菁-SiO2 纳米颗粒。使用三种不同的高量子产率方酸菁染料，通过稳态和时间分辨光致发光定性和定量研究所制备样品的光物理行为，以建立有助于优化制备方法的结构-性能关系。这些方酸菁染料不溶于水，如果用极性基团衍生，量子产率会严重降低。染料-APTS加合物的亲水性在决定其在新生二氧化硅基质中的分散中的作用得到了证实，并且证明了通过适当地施用加合物与助表面活性剂来改进工艺调整的可能性。
Hybrid squaraine-SiO2 nanoparticles extremely homogeneous in size (50 +/- 2 nm), and with photoluminescent emission in the optical tissue window, were prepare by using the reverse microemulsion technique. Three different high quantum-yield squaraine dyes were used and the photophysical behavior of the prepared samples were qualitatively and quantitatively studied, by steady state and time-resolved photoluminescence, in order to establish structure-property relationships useful for the optimization of the preparation method. These squaraine dyes are insoluble in water and suffer a severe decrease of quantum yield if derivatized with polar groups. The role of the hydrophilicity of the dye-APTS adduct in ruling its dispersion in the nascent silica matrix was confirmed, and the possibility to improve the tuning of the process by properly administration of the adduct with the co-surfactant was demonstrated.