| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 26723 | Journal of Photochemistry and Photobiology A: Chemistry | 2011 | 6 Pages |
It is normally difficult to use surface enhanced Raman scattering (SERS) to study molecular adsorbates at well-defined planar metal surfaces or at Pt-group catalytic metal surfaces. In this paper, highly localized gap-mode plasmons are excited on atomically smooth metal surfaces by using a sphere-plane type plasmonic cavity. This method enables us to observe Raman scattering signals from molecular adsorbates on various single crystalline metal surfaces including non-SERS-active Pt and Pd. SERS spectra of self-assembled isocyanide monolayers on several metal substrates with (1 1 1) or (1 0 0) orientation reveal a significant orientation dependence of preferential adsorption sites, which information is hardly obtainable from conventional SERS spectra.
► A sphere-plane plasmonic cavity is applied for SERS observation. ► This method enables us to observe SERS even at a highly damping Pt or Pd surface. ► This method provides us crystal orientation dependent SERS information. ► The advanced SERS technique is useful for studying metal–molecular interactions.
