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Graduate Student Seminar - 03/26/2010

"Surface-Enhanced Raman Scattering (SERS) on Silver Nanocube Dimers"

by Seung Yong

Friday, March 26, 2010 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Assistant Professor Oded Rabin

Silver nanocubes were synthesized via a modified polyol reduction protocol. The silver nanocubes formed ordered arrays of plasmonic structures by directed self-assembly at the predetermined positions in patterned silicon substrates. The monolayer of the aminothiophenol molecules was formed on the surface of silver nanocubes and Raman signals were measured. A wide range of SERS enhancement values from dimers were recorded due to variations on the configuration of the dimers from site to site. The silver nanocube dimers used in the SERS measurements were analyzed by SEM in order to correlate the SERS intensities with their configurations. All the dimers were sorted into three categories based on the relative orientation of the nanocubes. Our analysis shows that the distribution of enhancement factors of the three types of dimers can be modeled successfully by the Weibull distribution. Numerical calculation of Plasmon resonance frequencies and enhancement factors for the three types were carried out. We could determine which type is desirable for SERS.

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