Title :
The development of nano-structured plasmonic composite by two-step ion-exchange processes
Author :
Tsao, Shu-Yin ; Tai, Chao-Yi
Author_Institution :
Dept. of Opt. & Photonics, Nat. Central Univ., Jhongli, Taiwan
Abstract :
Surface enhanced Raman scattering (SERS) active substrate was fabricated using Ag+-Na+ ion-exchange technique. A thin layer of Aluminum was subsequently deposited which provides electrons and effectively promotes the reduction of the Ag+ ions in the follow-up Na+-K+ ion exchange process. The extinction spectrum exhibits a broadened and red-shifted peak indicating that the filling fraction was increased, and the distribution of the particle size and shape are multi-dispersed. The trend can be explained by Maxwell Garnett theory enabling molecular sensing over a wide spectral range. The spectral fingerprint of Rhodamine 6G molecules is successfully detected in the Raman spectrum.
Keywords :
composite materials; ion exchange; plasmonics; Maxwell Garnett theory; Raman spectrum; active substrate; extinction spectrum; filling fraction; ion exchange process; molecular sensing; nanostructured plasmonic composite; particle size; red shifted peak; spectral fingerprint; spectral range; surface enhanced Raman scattering; Optics; Substrates;
Conference_Titel :
Nanotechnology (IEEE-NANO), 2012 12th IEEE Conference on
Conference_Location :
Birmingham
Print_ISBN :
978-1-4673-2198-3
DOI :
10.1109/NANO.2012.6322190