Abstract
AbstractWe prepared ordered, two‐dimensional arrays of patterns with silver nanoparticles immobilized on patterned self‐assembled monolayers (SAMs) of alkanethiolates on gold, which were used as substrates for surface enhanced Raman scattering (SERS). Using contact‐mode atomic force microscopy, we have characterized the formation and structure of such silver pattern assemblies on a microcontact‐printed SAM patterned surface. SERS spectra and surface enhanced Raman mapping (SERM) of 4‐pyridinethiol SAMs on this novel SERS‐active substrate were also investigated. Different SERS activities were observed on the surface of the hierarchical micro/nanostructure. The enhancement factor was studied in detail and the electromagnetic enhancement mechanism was used to explain the SERS effect. Copyright © 2006 John Wiley & Sons, Ltd.
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