Using nonionic block copolymer P123 as a soft template and tetraethyl orthosilicate(TEOS)as the silicon source precursor,a functionalized silane coupling agent emitting green fluorescence was synthesized through the reaction of isothiocyanate fluorescein with 3-aminopropyltriethoxysilane(APTES).Fluorescein-modified single micelle nanoparticles with ultra-small sizes(10～12 nm)were prepared via the co-precipitation method.The morphology and surface fluorescein grafting of the nanoparticles were characterized by TEM,FTIR,and UV spectroscopy.The monodispersity and surface charge of the particles were assessed using DLS and Zeta potential measurements.Steady-state fluorescence spectroscopy revealed that the fluorescence emission band of the nanoparticles was around 500 nm.Detection of Fe3+in aqueous solutions using fluorescein-modified single micelle nanoparticles indicated that when the concentration of Fe3+in the solution was 1 × 10-5 mol/L,the fluorescence intensity of the green-emitting nanoparticles quenched to 10.1％of its original intensity.Therefore,these nanoparticles not only possess excellent fluorescence stability and water solubility but also exhibit outstanding Fe3+detection capabilities,presenting promising applications in the detection and identification of Fe3+in aqueous solutions.
关键词
单胶束SiO2荧光纳米粒子/核-壳结构/水体系/可控合成/共沉淀
Key words
Fluorescent silica single micellar nanoparticles/Core-shell structure/Water system/Controllable synthesis/Coprecipitation method
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