摘要
以正硅酸四乙酯为硅源,分别在碱性和酸性条件下制备了二氧化硅(SiO2)球状粒子;在碱性条件下制备了具有荧光功能的SiO2-FITC复合纳米球;以Sn2+作为敏化剂,在SiO2球表面沉积Ag纳米颗粒,制备了SiO2/Ag核-壳结构纳米粒子。通过透射电子显微镜(TEM)、紫外-可见近红外(UV-vis-NIR)分光光度计,荧光分光光度计对SiO2球,SiO2-FITC荧光纳米球,SiO2/Ag核-壳结构纳米粒子的形貌和光学吸收、荧光发射特性进行了表征。结果表明,碱性环境下制备的SiO2球粒径大小为纳米级,酸性环境下制备的SiO2球粒径大小为微米级,酸性环境下制备的SiO2球比碱性环境下制备的硅球致密。掺入FITC的SiO2球具有荧光发射特性,且发光强度可以控制。Ag纳米颗粒修饰的SiO2/Ag核-壳结构纳米粒子具有等表面等离子体共振吸收特性。
Two different routines to prepare silica spheres in acid and alkali condition were reported. A fluorescein isothiocyanate （F1TC）-doped silica spheres has been synthesized in alkali condition. Silver layers have been successfully coated on the mono-dispersed silica spheres to obtain SiO2/Ag core-shell spheres. The prepared nanoparticles and nanocomposites were characterized by the transmission electron microscopy, absorption spectra, and fluorescense. The results show that silica spheres prepared in acid is nano-scale while in alkali is micro-sized. FITC dye can be doped into silica spheres and the fluorescence emission intensity can be controlled. The SiO2/Ag nanocomposites have a spatial character of surface plasmon resonance absorption.
出处
《胶体与聚合物》
2009年第2期8-11,共4页
Chinese Journal of Colloid & Polymer
基金
国家自然科学基金NSFC(No.10534030)
