COLL 498 |
| Surface-enhanced Raman Spectroscopy (SERS) is a potentially useful tool for detection of environmental contaminants and health hazards. However, SERS is substrate sensitive with the amount of signal enhancement dependent upon many features of the substrate including surface roughness, colloid or defect size, proximity to other colloids or defects, and substrate material. Previous work has shown that surfaces with evenly etched features and colloids that are mechanically spaced create “hot spots” that show an increased enhancement over randomly spaced features. An analyte adsorbed on the substrate in these “hot spots” experiences a localized surface plasmon resonance from more than one colloid or defect and thus has a larger enhancement. Previous studies looking at the enhancements caused by colloids with known separations had either nothing or an inert material in the interstitial space. It is the purpose of this study to investigate the SERS effect on an analyte adsorbed on colloids separated from a gold surface by a conducting self-assembled monolayer (SAM). Enhancements to the SERS effect along with potential advantages of this type of substrate will be discussed. |
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Polymer-Nanoparticle Systems: Theory, Simulation, Experiments
2:00 PM-5:00 PM, Thursday, April 10, 2008 Morial Convention Center -- Rm. 227, Oral
Division of Colloid & Surface Chemistry |