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利用共溶胶蒸发诱导自组装方式制备有序介孔SiO2薄膜组装Au纳米粒子,合成了三种Au/SiO2纳米复合材料.光谱分析表明,介孔结构将影响复合材料消光特性;改变浸渍时间,Au纳米粒子体积增大并导致复合材料消光谱红移增强.基于Maxwell-Garnett(MG)理论,利用简化模型对复合材料的消光特性进行了分析,定性说明了复合材料消光特性存在差异的原因.在材料制备过程中,通过选用不同表面活性剂或者控制浸渍反应时间,能对Au/SiO2纳米复合材料的消光性质进行调控.
Three types of Au / SiO2 nanocomposites were prepared by the preparation of ordered mesoporous SiO2 films assembled by co-solvothermal self-assembly method. The spectral analysis showed that the mesoporous structure will affect the extinction properties of the composites. The impregnation time, Au And the redistribution of the extinction spectrum of the composites is increased due to the increase of the volume of the nanoparticles.The extinction characteristics of the composites were analyzed by using the simplified model based on the Maxwell-Garnett (MG) theory, which qualitatively explained the reasons for the extinction characteristics of the composites. In the process of material preparation, the extinction properties of Au / SiO2 nanocomposites can be controlled by choosing different surfactants or controlling the impregnation reaction time.