Presentation Information
[3H07]Enhancements of Raman scattering intensity of Rhodamine 6 G by Ag nanoparticles deposited by magnetron sputtering
*Eiji Kusano1 (1. Kanazawa Institute of Technology)
Enhancements of Raman scattering intensity of Rhodamine 6 G (R6G) due to sputter-deposited Ag NP are investigated. Firstly, Ag nanoparticles were deposited onto a non-alkaline glass substrate by magnetron sputtering at a substrate temperature of 600 ℃. Then, 10 μL of R6G ethanol solution from 1.0×10−2 to 1.0×10−6 mol L−1 were dropped onto Ag NP substrates. After drying of ethanol solvent, Raman scattering was measured by using excitation lasers with wavelengths of 532, 633, and 786 nm. Scanning electron microscopy observation well demonstrates that deposited Ag thin films well form NPs with a high dispersibility and uniformity in particle size. The results of Raman scattering spectroscopy for the R6G concentration of 1.0×10−4 to 1.0×10−6 mol L−1 demonstrate the enhancement of R6G absorption by Ag NPs. Peaks observed at 513–516, 774–775, 1361–1364, 1512–1517, and 1645–1651 cm−1 were identified to the absorption due to R6G. Interestingly, no enhancement was observed in Raman spectroscopy using the excitation laser of 786 nm. The mechanisms in absorption enhancements due to Ag NP and their excitation wavelength dependence will be discussed in the presentation.