不同银膜粒径对单壁碳纳米管SERS谱的影响

Effects of Silver Films with Different Nano-particle Sizes on SERS of Single-walled Carbon Nanotubes

利用化学沉积法和溶胶法制备了粒径在20～100 nm范围内不同的表面增强纳米结构活性银膜, 系统地研究了单壁碳纳米管(SWCNT)的表面增强拉曼光谱(SERS)的G-band和D-band. 比较玻璃和石英两种不同基片上的结果发现, 单壁碳管的SERS谱随银膜粒径的变化有相同的变化趋势. G-band峰移对20～100 nm范围内活性银膜粒径的差异不敏感, 表明该波段所对应的碳管六元环本征振动比较稳定, 与界面的化学相互作用较弱. D-band的峰形随基片和活性银膜粒径不同均有改变, 且随着粒径变小, 高频振动贡献有增大的趋势, 表明无序碳与活性银膜间存在很强的相互作用.

Surface-enhanced Raman Scattering（SERS） spectra of single-walled carbon nanotubes（SWCNTs） on silver films with different nano-particle sizes from 20-100 nm deposited on quartz and glass substrates were studied systematically. The characteristic Raman spectral features of SWCNT G-band and D-band were analyzed. The two bands show a similar tendency with the change of nano-particle size of silver on quartz and glass substrates. The position and the intensity of the G-band are less sensitive to the films silver particle sizes in the studied range, indicating that hexagonal carbon rings are stable and have a weak interaction with silver films. The shape of the D-band is dependent on the silver size. The smaller the silver particle size, the more the contribution of high frequency vibrations to the D-band, indicating that disorder carbon has a strong interaction with the active silver films.