2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Silver Particle and Silver Thiolate-Based Molecular Sensing/Recognition Units Operating via Surface-Enhanced Raman Scattering

K. Kim, H.K. Park, N.H. Kim, H.S. Lee and Y.M. Lee
Seoul National University, KR

Keywords:
Ag powder, Ag thiolate, SERS, molecular recognition

Abstract:
Noble metallic nanostructures exhibit a phenomenon known as surface-enhanced Raman scattering (SERS) in which the scattering cross sections are dramatically enhanced for molecules adsorbed thereon. We demonstrate that commercially available Ag( Ag) powders can be used as a core material for constructing molecular sensing/recognition units operating via SERS. In addition, we demonstrate that silver benzenethiolate and its analogues can also be used as a core material of molecular sensing/recognition units. This is possible since aromatic silver thiolates possess peculiar photoreaction characteristics that when an argon ion laser is exposed to silver benzenethiolate, for instance, its Raman spectrum changes with time, eventually becoming the same as the SERS spectrum of benzenethiol on a roughened Ag substrate. The strategy to assemble molecular sensors is then the same as for Ag powders except that SERS markers are no longer required.

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