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Wednesday, April 22 • 8:30am - 10:30am
Modeling Surface Enhancement due to Silver Nanowires

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Silver nanowires created by ferroelectric lithography are studied to determine if they are appropriate for use as Surface-Enhanced Raman Spectroscopy (SERS) substrates. Raman spectroscopy is used to identify and characterize materials based on the vibrational energy shifts resulting in inelastically scattered light. This effect is ordinarily so weak that it is difficult to detect, but this obstacle can be overcome through surface-enhancement which occurs near nanometer-scale roughened silver surfaces. Surface enhancement occurs because of surface plasmon resonance (SPR) on the silver nanoparticles. The resonant frequency of the plasmon, a quantized electron density present in the solid, is lowered into the visible region when near nanometer-scale curved particles, enhancing the light scattered during spectroscopy. The goal of this research project is, using the current theory of SPR in the literature, model the nanowires as a pearl-necklace arrangement of silver spheres, and predict the enhancement effects due to different sizes and spacing of spheres. Ultimately, these predictions will be used to study the effectiveness of silver nanowires in SERS, where they may be applied as substrates in low-detection limit and single-molecule spectroscopies.


Wednesday April 22, 2015 8:30am - 10:30am PDT
Wilma Sherrill Center Concourse

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