不同表面活性剂对Sn基底表面银纳米粒子薄膜的原位生长及其光学性能的影响

In-situ growth and optical properties of the Ag nanostructure on Sn substrate using different surfactants

以Sn基底为活性基底,通过不同表面活性剂的作用,采用原位置换法在其表面制备出形貌各异的银纳米粒子薄膜材料.采用扫描电镜、X射线衍射仪、紫外可见分光光度计、荧光分光光度计等测试手段对样品进行分析和表征,并考察银纳米粒子的形貌对其薄膜基底表面增强拉曼散射(SERS)活性的影响.结果表明:随着反应液中表面活性剂种类的改变,银纳米粒子的形貌发生改变.当表面活性剂为聚乙烯吡咯烷酮(PVP)时,制备出的由银纳米粒子具有极强的紫外可见吸收光谱红移;并且以此条件得到的SERS活性基底具有极强的SERS信号.

In the active Sn substrate,we can get multiple morphologies of Ag nanocrystals though organ- ic-free replacement reaction system assisted by different surfactants. By using scanning electron microscopy（SEM）, ultraviolet absorption spectroscopy,X-ray diffraction（XRD）, and fluorescence spectrophotometer, We can analyze the prepared samples and the influence on surface enhanced Raman scattering （SERS） activity of substrate. It is indicated that the morphologies of Ag nanocrystals change with the change of organic additives. When the organic additive is Polyvinylpyrrolidone （PVP）, the Einstein shift of ultraviolet absorption spectroscopy for the Ag nanocrystals is the biggest with the most obvious SERS signal for the SERS activity substrate.