Experimental Research on Double-walled Carbon Nanotubes by Using Tip-enhanced Raman Spectroscopy

In this research, a transmission mode tip-enhanced Raman spectroscopy (TERS) system is set up. Using this self-made TIERS system; topographic images and corresponding TERS spectra of positions of interest on a thin film of dispersed double-walled carbon nanotubes (DWNTs) are investigated. The Raman enhancement factor is estimated to be 3.6 x 10(2). TERS spectra of different measured positions show distinct Raman features that represent their different components and structures. This indicates that characterization of DWNTs and Raman spectral recognition can be realized. The experimental results indicate that there is a peak shift between the TERS and the far-field spectrum in radial breathing mode region; which may be attributed to a combination of the tip's mechanical pressure and the interaction between the two layer tube walls of the DWNTs.