Enhanced Raman scattering of ZnO nanocrystals in the vicinity of gold and silver nanostructured surfaces
Résumé
Nonresonant surface enhanced Raman scattering by optical
phonons of ZnO nanocrystals on and beneath silver and gold island films is
reported. For both configurations comparable SERS efficiency is observed,
proving their potential utility. Variations in peak intensities can be
attributed to difference in the morphology of island films on and beneath
nanocrystals as well as to variation of the interface between semiconductor
and metal. The dominant peaks in the SERS spectra are assigned to surface
optical phonon modes.