菁
荧光团
纳米颗粒
荧光
单体
材料科学
分子
芘
化学工程
溶剂变色
光化学
化学物理
化学
纳米技术
聚合物
光学
有机化学
物理
工程类
复合材料
作者
Gabriele Alberto,Ivana Miletto,Guido Viscardi,Giuseppe Caputo,Loredana Latterini,Salvatore Coluccia,Gianmario Martra
摘要
Spherical hybrid cyanine−silica nanoparticles, quite homogeneous in size (ca. 50 nm) were prepared by the reverse microemulsion method. Solvatochromism tests indicated that all fluorophore molecules were actually entrapped within the inorganic matrix. The combination of steady-state and time-resolved fluorescence measurements allowed us to conclude that almost all cyanine molecules exhibited the same photophysical behavior and this suggested they should be dispersed in a monomeric form. Such behavior resulted in a significant brightness enhancement per cubic nanometer of nanoparticle with respect to molecules in solution. The occurrence of the optical interparticle effect by progressively decreasing the distance among hybrid nanoparticles passing from suspension to a dry powder was also investigated.
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