Metal–organic semiconductor films are fabricated as co-evaporated films. It is demonstrated that the technique can be used to fabricate metal-semiconductor surface-enhanced Raman scattering (SERS) or surface-enhanced resonance Raman scattering (SERRS) substrates or to attain SERS or SERRS of highly insoluble pigments. The experiments are carried out using three different pigments: iron phthalocyanine (FePc) and two substituted tetracaboxylic perylenes (PTCDs). The structure of the co-PVD films was characterized at the nanoscale by scanning electron microscopy through field-emission gun (SEM-FEG), revealing a fairly homogeneous spatial distribution of the silver-pigment nanoparticles. The fabricated mixed nanostructures show a homogenous distribution of plasmon enhancement as observed in the point-by-point mapping of the SERRS spectra recorded with micrometer spatial resolution in Raman microscopy.
Priscila Alessio, J. A. de Saja Saez, Ricardo F. Aroca, and Carlos J. L. Constantino, "Metal–Organic Semiconductor Nanostructures for Surface-Enhanced Raman Scattering," Appl. Spectrosc. 65, 152-158 (2011)