|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Plasmonics in Nanocomposite Materials
||Spectral Enhancement of Dye Molecules Adsorbed on Titania Prepared on Gold Nanoparticles
||Hiromasa Nishikiori, Yosuke Kageshima, Katsuya Teshima
|On-Site Speaker (Planned)
Fluorescein adsorbed on TiO<sub>2</sub>/Au/Si showed obvious IR peaks, whereas the IR absorption of the dye adsorbed on the titania film without Au was quite weak. The amount of the adsorbed dye was also assessed by UV-vis absorption spectrum of the dye dissolved into acidic aqueous solution. Since the adsorption amount of the dye on the titania was independent of the Au existence, the increased IR absorption of fluorescein/TiO<sub>2</sub>/Au/Si should originate from the surface plasmon resonance of Au. The enhanced IR absorption was preferable to monitor the slight change in the electric charge on the titania surface. A peak for the asymmetric COO<sup>-</sup> stretch was located at a lower wavenumber for the titania films UV-irradiated for a longer time such that the monoanion and dianion species exhibit peaks at 1584 and 1573 cm<sup>-1</sup>, respectively. The relative amount of the dianion clearly increased by the UV irradiation due to the surface change.