纳米SiO_2颗粒表面修饰的有机分子在介质中的光物理行为研究

利用Sol-Gel方法投篮了单分散性很好的球型二氧化硅纳米颗粒，通过表面化 学修饰法引入了带有荧光发色团的有机分子，通过稳态光物理方法研究了纳米颗粒 表面的有机分子在水、乙醇以及阴、阳离子表面活性剂悬浮液中的光物理行为。实 验表明，纳米颗粒表面有机分子的分散状态是决定其光物理行为的主要因素。这一 结果为设计和开发新型“壳-核”型纳米二氧化硅荧光传感器提供了有用的参考。

A Study on Photophysical Behavior of Silica Gel Nano-Particles Modified by Organic Molecule in Different Mediums

A spherical mono-dispersed silica nano-particle system has been prepared by sol-gel method. After surface modification fluorescent organic chromophore was introduced onto the particle surface. The steady state photophysical behavior of this system in different mediums has been studied carefully. The results indicated that the structural charac~teristics of organic chain attached and the dispersed situation of organic chromophore on surface both were the main factors for the photophysical behavior of suspension studied. These results will be important and beneficial for the design or development of this system used as a fluorescence chemical sensor.