SERS studies on monolayer films

As a sensitive analytical tool, SERS spectroscopy can greatly increase both sensitivity and specificity of Raman spectroscopy. Hitherto, it has been considered that two mechanisms should be responsible for the SERS enhancement. 

SERS Studies on Metallophthalocyanine Self-Assembled Films on Different Organic-Monolayer-Modified Films 

Li et al. [47] fabricated SAMs of ruthenium phthalocyanine (RuPc) on a silver substrate precoated with an SAM of 4-mercaptopyridine (PySH) or l,4-bis[2-(4-pyridyl)ethenyl]-benzene (BPENB). SERS spectroscopy was used to explore the structure and orientation of the self-assembled films, and they successfully observed Raman bands due to vibrational modes of the pigment molecules in the composite films in the SERS spectra. 

Wavenumbers and assignments for the SERS bands of RuPc in bulk (from Ref. [47]) 

---