Surface-Enhanced Raman Scattering and Imaging of Langmuir—Blodgett Monolayers of Bis(Phenethylimido)perylene on Silver Island Films

Author:

Aroca R. F.1,Constantino C. J. L.1,Duff James1

Affiliation:

1. Materials and Surface Science Group, School of Physical Sciences, University of Windsor, Windsor, Ontario N9B 3P4 Canada (R.F.A., C.J.L.C.); and Xerox Research Centre of Canada 2660 Speakman Drive, Mississauga, Ontario L5K 2L1, Canada (J.D.)

Abstract

The optical spectra of bis(phenethylimido)perylene (PhPTCD) are discussed. Surface-pressure area isotherms of floating Langmuir monomolecular layers have been obtained, and Langmuir-Blodgett (LB) molecular monolayers of the material have been fabricated on silver island substrates for surface-enhanced vibrational studies. The electronic absorption and emission spectra of solutions and thin solid films are described. The vibrational spectra, infrared and Raman for the bulk, and the surface-enhanced Raman (SERS) and resonance Raman scattering (SERRS) spectra of LB monolayers have been obtained. Surface-enhanced fluorescence (SEF) for LB films is also demonstrated. Given the unique properties of the LB coated silver surfaces, the mapping of the SERS/SERRS signal and global Raman images, at a particular vibrational wavenumber, were obtained by using the 780 and 514.5 nm laser lines. The images give a visual picture of the variation of the SERRS and SERS signal intensity on the rough metal surface.

Publisher

SAGE Publications

Subject

Spectroscopy,Instrumentation

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