10.1021/jp710375c.s002 Robert J. Davis Robert J. Davis Jeanne E. Pemberton Jeanne E. Pemberton Investigation of the Interfaces of Tris-(8-hydroxyquinoline) Aluminum with Ag and Al Using Surface Raman Spectroscopy American Chemical Society 2008 intensity Surface Raman SpectroscopySurface Raman spectroscopy Alq 3 structure Alq 3 Alq 3 films results deposition Ag surface enhancement mode 2008-03-20 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Investigation_of_the_Interfaces_of_Tris_8_hydroxyquinoline_Aluminum_with_Ag_and_Al_Using_Surface_Raman_Spectroscopy/2950114 Surface Raman spectroscopy in ultrahigh vacuum is used to interrogate interfaces formed between tris-(8-hydroxyquinoline) aluminum (Alq<sub>3</sub>) and vapor-deposited Ag and Al. Vapor deposition of Ag onto Alq<sub>3</sub> films results in preservation of the Alq<sub>3</sub> structure with evolution of simple surface enhancement of Alq<sub>3</sub> spectral intensities. Changes in the relative intensities of ring breathing and ring stretching modes of Alq<sub>3</sub> upon deposition of Ag are consistent with weak interaction of Ag with the conjugated ring of the ligand. In contrast, vapor deposition of Al onto Alq<sub>3</sub> films results in the appearance of new vibrational modes, but only for Al coverages >10 Å mass thickness, consistent with the formation of an Al−Alq<sub>3</sub> adduct. At these coverages, slight surface enhancement of spectral intensities is also observed along with growth of several broad modes consistent with partial graphitization of the organic film.