Highly Manufacturable Nanoporous Ag Films Using New Sputtering System for Surface Enhanced Raman Scattering Substrate

Ag/Na Ion Exchange in Fluorophosphate Glasses and Formation of Ag Nanoparticles in the Bulk and on the Surface of the Glass

“…In ref the Raman spectrum of the silver films obtained by sputtering was studied and featured with a number of bands, the origin of which remained without explanation. The comparison of the bands observed for the studied samples and Raman spectra presented in ref indicated significant differences in the positions and number of bands. We assume that the observed band may relate to the luminescence of the large clusters that are under the nanoporous Ag film.…”

“…54 It should be noted that there is a great interest in obtaining long-term stable SERS substrates. 22,52 It is was found that the films obtained by heat treatment of FP glasses in the hydrogen atmosphere have not changed their characteristics within two years after manufacture.…”

“…As a probe, we used Rhodamine 6G (Rh6G) (Sigma-Aldrich, Inc.) as a highly fluorescent Rhodamine family dye, often applied to determine the rate and direction of flow and transport, particularly as a model dye to probe the nature of the SERS effect. − A dilute aqueous solution of Rh6G was prepared for a SERS study. This solution was dropped on the nanoporous Ag film and dried at room temperature within 30 min.…”

“…We found it difficult to identify this band. In ref the Raman spectrum of the silver films obtained by sputtering was studied and featured with a number of bands, the origin of which remained without explanation. The comparison of the bands observed for the studied samples and Raman spectra presented in ref indicated significant differences in the positions and number of bands.…”

“…Nevertheless, the sensitivity achieved using nanoporous Ag film on FP glass is close to that reported for SERS-active substrates obtained by sputtering and exceeds by more than order of magnitude the data obtained for island structures . It should be noted that there is a great interest in obtaining long-term stable SERS substrates. , It is was found that the films obtained by heat treatment of FP glasses in the hydrogen atmosphere have not changed their characteristics within two years after manufacture.…”