Fourier transform surface-enhanced Raman scattering of C-70 on a roughened silver surface

The surface-enhanced Raman (SER) spectrum of C-70 measured on an electrochemically-roughened silver surface using a Fourier transform Raman spectrometer with near infrared excitation is reported. The spectrum is very similar to the normal Raman spectrum of C-70, indicating little or no interaction between the C-70 molecules and the silver surface. A detection limit of about 11 ng of C-70 was found. Comparison with previously reported SERS results for C-70 showed significant differences for near infrared excitation. In particular, the band near 455 cm(-1) was very intense for near infrared excitation but weak for visible excitation, and the band 1564 cm(-1) was, conversely, weak for near infrared excitation but very intense when visible excitation was used.