Ag-deposited silica and polystyrene beads are efficient surface-enhanced-Raman-scattering (SERS) substrates that can be used as core materials of SERS-based biosensors. In this work, we report that once rhodamine B isothiocyanate (RhBITC) is adsorbed onto them, it exhibits not only a strong SERS signal but also a fairly intense fluorescence, contrary to the usual expectation that the fluorescence will be quenched by metal nanoaggregates. To our knowledge, this is the first report informing the simultaneous observation of fluorescence and SERS for dye molecules assembled on metal nanoaggregates. The application prospects of these materials are thus expected to be very high especially in the areas of biological sensing and recognition that rely heavily on optical and spectroscopic means.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2008: Materials, Fabrication, Particles, and Characterization – Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, Volume 1
Published: June 1, 2008
Pages: 696 - 699
Industry sector: Advanced Materials & Manufacturing
Topics: Nanoparticle Synthesis & Applications