The binding of phosphonic acid-based organometallic complexes to core-shell Ag@TiO2 nanoparticles is described and is compared to the silicon oxide shell analog. We demonstrate the importance of controlling the TiO2 shell in SERS applications, specifically SHell-Isolated Nanoparticle-Enhanced Raman spectroscopy (SHINERS) in which the Raman amplification of the signal is provided by metal nanoparticles with an ultrathin metal oxide shell. Silver is known to possess an intense plasmon band, is a relatively inexpensive metal and is also stable towards oxidation. We decided to focus our attention towards Ag@TiO2 nanoparticless, in which a titania shell prevents oxidation of silver and allows the grafting of a bipyridine-based ligand bearing a phosphonic acid group through the formation of an iono-covalent bond. The SPR of our SHINERS core-shell Ag@TiO2 particles is used here to probe a copper(II) complex adsorbed onto the surface by Raman spectroscopy using plots of enhancement profiles vs excitation wavelengths. Stability studies of ligand functionalized core-shell Ag@TiO2 films in water and various organic solvents will also be described.

Bipyridine functionalized core-shell Ag@TiO2 nanoparticle films for enhanced Raman spectroscopy: Applications for the detection of Cu(II) ions and film stability studies

2019 Spring National Meeting

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