RAMAN-SCATTERING OF MOLECULES ADSORBED ON A ROUGH AL SURFACE

There are still some ambiguities on the surface-enhanced Raman scatter ing (SERS) of Al surfaces. In this work, some experimental results for normal Raman scattering and resonance Raman scattering from p-nitrobe nzoic acid (PNBA), Rhodamine 6G and dye 1555 adsorbed on substrates of metal Al and aluminum oxide are reported. We used the techniques of d ipping, immersing and spinning to deposit molecules on substrates whic h were produced by lithography or mechanical polishing. All the result s show that there is no enhancement for the molecules on these surface s. The observed Raman bands from PNBA adsorbed on a substrate of litho graphically produced Al were from bulk molecules of PNBA. The results are well explained by the antenna resonator model of SERS.