C70分子吸附于铜表面的增强拉曼光谱研究

报道了C70分子吸附于铜表面的增强拉曼光谱.通过与正常拉曼光谱以及银表面SERS谱的比较发现,C70分子与铜表面之间的吸附属于物理吸附,增强机制主要是电磁增强.C70分子在银表面上的吸附状态与铜表面上的不同,这导致了两者特征峰谱线强度分布存在差异.以C60的振动模式为参考,推断出C70分子在2种金属表面上的吸附状态可能分别处于使碳笼的挤压振动模接近于“平躺”和“竖直”的2种状态.

Surface-enhanced Raman Spectra of C70 Molecules Adsorbed on the Surface of Copper

The SERS effect of C70 molecules adsorbed on the surface of copper was reported for the first time. By comparing with the normal Raman and the SERS on the surface of silver, it sounds reasonable that the adsorption between the copper and C70 is a physical adsorption, and electromagnetic enhance mechanism dominates over the surface enhanced effect. The difference of relative intensities between the SERS spectra of C70 adsorbed on the silver surface and copper surface originates from different adsorption states of C70 molecules on them. Judged by the vibration mode of C70, the adsorption states on the two different metal surfaces could be described as near “horizontal” and near “upending” directions, respectively. This investigation is valuable for the research of interaction between C70 molecules and different metal surfaces.