2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Rhodamine B Isothiocyanate-Modified Ag Nanoaggregates on Dielectric Beads: A Novel Surface-Enhanced-Raman-Scattering and Fluorescent Imaging Material

K. Kim, H.B. Lee, H.J. Jang, J.W. Lee
Seoul National University, KR

SERS, Fluorescence, Imaging, Ag nanoaggregates, Rhodamine B Isothiocyanate

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.

Nanotech 2008 Conference Program Abstract