SUTROVÁ Veronika Charles University in Prague

Testing of New Active Surface based on Ag Nanoparticles by Surface-enhanced Raman Scattering and Surface Enhanced Luminescence of Ru(II)tris(bipyridine) Complex Dication

Co-authors KOKOŠKOVÁ Markéta, ŠLOUFOVÁ Ivana, VLČKOVÁ Blanka, KAPUSTA Peter, MICHL Martin, ŠLOUF Miroslav
Collaboration: J. Heyrovsky Institute of Physical Chemistry AS CR v.v.i., Prague, Czech Republic, EU; Czech Technical University in Prague, Prague, Czech Republic, EU; Institute of Macromolecular Chemistry AS CR v.v.i., Prague, Czech Republic, EU

Compact aggregates of chloride-modified Ag nanoparticles (NPs) deposited on glass slides were tested as new active surfaces for SERS and surface enhanced luminescence. For SERS spectral measurement, the selected aggregate in which [Ru(bpy)3]2+ was incorporated, was overlayed by a drop of water to prevent thermally induced decomposition of the adsorbate. SERS spectra excited at 532 nm were measured as a function of concentration, and the 1x10-14 M value of the SERS spectral detection limit was determined. A phosphorescence lifetime image of [Ru(bpy)3]2+ was obtained from an aggregate overlayed by a thin layer of 1x10-5 M aqueous solution of [Ru(bpy)3]2+, while no signal was detected from the same solution of the complex in the absence of the aggregate. This result documents observation of surface-enhanced luminescence of the [Ru(bpy)3]2+ complex dication in the presence of the Ag NPs aggregate. ACKNOWLEDGEMENTS: Financial support: P208/10/0941 grant (Czech Science Foundation) and 558213 (GAUK).