Surface‐enhanced raman scattering from poly(4‐vinyl pyridine)

Abstract

SynopsisSurface-enhanced Raman scattering (SERS) has been observed for poly(4-vinyl pyridine) ahsorbed onto silver island films. Bands near 1219 and 1613 c m -' , which are weak in normal Raman spectra of PVP, are strong in SEW spectra, and the band near 1020 cm-', which is the strongest band in the normal spectra, is relatively weak in SERS. The strongest bands in the SEHS spectra all belong to the same symmetry species as a z z , implying that the pyridine moieties are adsorbed through the nitrogen atoms with a vertical conformation. The ring breathing mode of the pyridine rings is observed near 1020 cm ', a frequency characteristic of pyridinium ions or coordinated pyrinidine, providing further evidence for adsorption through the nitrogen atoms. Silver catalyzed photooxidation, which can lead to the appearance of artifacts in SEW spectra, particularly of polymers, can be reduced by overcoating SEILS samples with thin films of polymers such as poly(methy1 methacrylate) that have low Iiaman scattering cross sections.

Entropic depletion effect on supermolecular assembly: control of geometry of adsorbed molecules in coatings

“…In the Raman spectrum of substituted benzimidazole, the band near 1320 and 510 cm 1 are due to out-of-plane C-H deformation, and the band at 1600 cm 1 is due to ring stretching modes. 27 The SERS spectrum in Fig. 3(B) shows an enhanced and shifted band at 510 cm 1 and a very weak band at 1600 cm 1 , indicating that the benzimidazole rings are 'lying down' flat on the surface, whereas the SERS spectrum in Fig.…”

Studies on Polymer-Metal Interfaces, 4. Effect of Substituent of Polymethacrylate on the Interfacial Characteristics between Polymethacrylates and Copper

“…[16,17] Commercial copper plates with a thickness of 1.5 mm were mechanically polished with a series of dry silicon carbide abrasive papers ranging from 320 to 2 000 grit. After the surface was ground, wet polishing was performed using 0.05-lm alumina powder in Microcloths (Buehler Inc.) with deionized water as the lubricant.…”

Studies on polymer-metal interfaces, 3. An analysis of interfacial characteristics between amine-functionalized polystyrene/copper and between hydroxyl-functionalized polystyrene/copper

“…[9,10] Commercial copper plates with a thickness of 1.5 mm were mechanically polished with a series of dry silicon carbide abrasive papers ranging from 320 to 2 000 grit. After the surface was grounded, wet polishing was performed using 0.05 lm alumina powder in Microcloths (Buehler Inc.) with deionized water as a lubricant.…”

“…For example, it has been reported that the adhesion strength between polymer and metal could be enhanced significantly by incorporation of nitrogen-or oxygen-containing functionalities into the polymer. [4][5][6][7][8] Although many researchers have reported about the interfacial activity of a nitrogen-or oxygencontaining functionality onto a metal surface, [9][10][11][12] a systematic analysis on the difference in the adsorption behavior between these two functionalities onto a metal surface is still lacking.…”