Non-Destructive Characterization of Epoxy/Dicyandiamide Interphases Using Surface-Enhanced Raman Scattering
Abstract
Surface-enhanced Raman scattering (SERS) is a process in which the Raman scattering cross section of molecules adsorbed onto the surfaces of metals such as silver, copper, and gold is increased by as much as six orders of magnitude compared to the cross section for normal Raman scattering from the bulk. However, the enhancement is short-range and is restricted to the first few layers of molecules adjacent to the surface. As a result, SERS can be used to characterize adsorption of organic compounds onto metals and can be used for non-destructive characterization of interphases between polymer films and metal substrates as long as the polymer films are not so thick that normal Raman scattering from the bulk of the film is more intense than SERS from the interphase. SERS spectra obtained from thin films of dicyandiamide (dicy) adsorbed from dilute solutions onto silver island films were characterized by very strong bands assigned to in-plane vibrations and very weak vibrations related to out-of-plane vibrations, indicating that dicy was adsorbed with a vertical configuration involving coordination through the nitrilo nitrogen atom. (rrh)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1989
- Accession Number
- ADA215894
Entities
People
- F. James Boerio
- P. P. Hong
Organizations
- University of Cincinnati