基于金纳米棒的等离子体荧光增强体系构建及其对四羧基铝酞菁单态氧产量的影响研究

Construction of a Plasmon-enhanced Fluorescence System Based on Gold Nanorods and Its Effect on Single State Oxygen Production of Tetracarboxyl Aluminum Phthalocyanine

在合适的外场激发下,金属纳米粒子可以产生较强的表面等离子共振,并使其周围荧光分子的荧光明显增强,该现象称为金属增强荧光。在实际制备中,荧光增强往往与荧光分子的光谱性质和荧光分子与金属表面的距离息息相关。本实验以金纳米棒(Au NRs)为基底材料,光敏剂四羧基铝酞菁(AlC_(4)Pc)为荧光分子,合成了Au NRs@SiO_(2)-AlC_(4)Pc纳米粒子,通过匹配Au NRs的径向表面等离子共振峰与AlC_(4)Pc的荧光发射峰,制备从2.1 nm至28.6 nm不同厚度的SiO_(2)壳层以调整Au NRs和AlC_(4)Pc的间距,最终间距为10.6 nm时获得了7.0倍的荧光增强和2.1倍的单态氧产量。

Under appropriate external excitation,metal nanoparticles can generate strong surface plasmon resonance and significantly enhance the fluorescence of surrounding fluorescent molecules,a phenomenon known as metal enhanced fluorescence(MEF).In actual preparation,fluorescence enhancement is often closely related to the spectral properties of fluorescent molecules and the distance between fluorescent molecules and metal surfaces.Herein,a series of silica-coated gold nanorods(Au NRs@SiO_(2))nanoparticles with different shell thickness were synthesized initially and a novel photosensitizer as well as a fluorophore,tetra-substituted carboxyl aluminum phthalocyanine(AlC_(4)Pc),was immobilized onto the silica shell.By adjusting the shell thickness from 2.1 nm to 28.6 nm,the co-enhancement of fluorescence intensity and singlet oxygen generation were reached their maximum effect when the distance of AlC_(4)Pc and Au NRs was around 10.6 nm,with 7-fold and 2.1-fold increased respectively.