修饰银电极上单壁碳纳米管的表面增强拉曼散射

Surface-Enhanced Raman Scattering of Single-Walled Carbon Nanotubes on Modified Silver Electrode

本文采用修饰了银纳米颗粒的银电极作为基底，获得了高质量的单壁碳纳米管（SWCNTs）的表面增强拉曼散射（SERS）光谱。在1100-1500cm^-1范围内观测到了一组表征SWCNTs结构的新峰。修饰在银电极上的银纳米颗粒不仅可以保证SWCNTs在这一体系中吸附的紧密性，而且通过变面等离子体共振起到了电磁放大的作用。通过对银纳米颗粒修饰银电极表面SWCNTs的SERS光谱及其随电位变化的SERS光谱的研究，我们可以研究这一过程中的SERS机制。理论和实验结果表明，银纳米颗粒修饰银电极上单壁碳纳米管的SERS很有潜力成为一种检测单壁碳纳米管合成质量的新方法。

A roughed silver electrode modified with silver nanoparticles is used as a substrate, on which high quality SERS of SWCNTs are obtained, indicating that the modified silver electrode is a high- quality SERS- active substrate for SWCNTs. Some new bands in 1100--1500 cm^-1 that indicate the structure of SWCNTs were obtained. The silver nanopaxticles modified on the roughed silver electrode surface can not only make sure the strong adsorption of SWCNTs in this system but also play an important role in magnifying the surface local electric field near the silver electrode surface through resonant surface plasmon excitation. From the rich information on the modified silver electrode obtained from the SERS and the potential dependent SERS, we may deduce the probable SERS mechanism in the process. The theory and experimental results indicate that it is can be used as a new technique for monitoring synthesis quality of SWCNTs.