Studies of surface-enhanced Raman scattering of C60 Langmuir-Blodgett film on a new substrate

A new substrate of "gold nano-particle/silver nano-rod/ITO surface" was obtained by electrodeposition. Surface-enhanced Raman scattering (SERS) spectrum of high quality of C-60 and stearic acid (SA) mixed Langmuir-Blodgett (LB) film shifted onto the new substrate was reported for the first time according to our knowledge. The results show that the substrate of "gold nano-particle/silver nano-rod/ITO surface" is very effective and active for C-60 LB film. Furthermore, the C-60 molecules are oriented on pentagons of C-60 on the substrate. It is difficult to separate the electromagnetic and chemical mechanisms to the great enhancement of the Raman signal. On the one hand, the gold nano-particles grown on silver nano-rod surface perform an important action for magnifying the surface local electric field through the resonant excitation of surface plasma. And the needle-like rod may further magnify the local electric field because of lightning rod effect. On the other hand, charge transfer factor may not be neglected. (C) 2007 Published by Elsevier B.V.