Abstract
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.
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