SERS study of single-walled carbon nanotubes on silver films deposited on different substrates

Surface-enhanced Raman Scattering of single-walled carbon nanotubes(SWNTs) on silver films deposited on various substrates, including sapphire,. quartz and glass, has been studied systematically. The characteristic features of G band and D band have been analyzed and compared with arc discharge and laser ablation samples'. Dband is much more sensitive than Gband. The position and the intensity of the Gband in SERS spectra dependenton on substrates.The peakshift and absolute intensity of Gband on sapphire is obviously larger than that on glass. The coritribution of high frequency vibrations to the Dband is also depen dent on substrates Compared to the SWNTs sample wit h high semiconducting tube concentration, the sample with high metallic,tube concentration has a stronger interaction with silver films.