修饰银纳米粒子的石墨烯泡沫镍衬底制备及其SERS活性研究

Preparation of Silver Nanoparticles Decorated Graphene Based Nickel Foam Substrate for SERS Activity Study

摘要:

为了解决表面增强拉曼散射(SERS)衬底的吸附性差、稳定性低以及灵敏度不高的问题, 设计了一种沉积银纳米粒子的石墨烯泡沫镍SERS衬底, 并进行了实验研究。利用化学气相沉积法在泡沫镍衬底上生长石墨烯, 并通过溶液沉积的方法将合成的银纳米粒子沉积在石墨烯泡沫镍衬底表面, 烘干后制备成石墨烯泡沫镍修饰银纳米粒子的新型SERS衬底。采用罗丹明6G(R6G)对SERS衬底进行拉曼实验研究, 结果表明石墨烯能够较好地淬灭SERS衬底的背景荧光; 泡沫镍的独特三维结构能够增大衬底对检测分子的吸附; 同时, 银纳米粒子也可大幅增强衬底的SERS活性。而修饰了银纳米粒子的石墨烯泡沫镍新型衬底同时具有以上优异特性, 是一种具有很大应用潜力的新型SERS衬底。

Abstract:

In order to overcome the shortcomings of the traditional surface enhanced Raman scattering substrate (SERS) such as weak adsorption, poor stability as well as low sensitivity, graphene nickel foam SERS substrates deposited with silver nanoparticles were prepared. Graphene was grown on the nickel foam by using the CVD method and the silver nanoparticles are deposited on the graphene nickel foam to obtain the desired SERS substrate. To investigate the SERS activity, the R6G was employed, and the results indicate that the graphene exhibits the ability to quench the fluorescence background. In the meantime, the three-dimensional structure of nickel foam can increase the molecular adsorption, and the silver nanoparticles can amplify the SERS activity.