Study of the C60/Ag Interface of a Large Area Nanoarchitectured Ag Substrate Using Surface-Enhanced Raman Scattering

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• 作者：Akram A. Khosroabadi ; Dallas L. Matz ; Palash Gangopadhyay ; Jeanne E. Pemberton ; Robert A. Norwood
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：August 7, 2014
• 年：2014
• 卷：118
• 期：31
• 页码：18027-18034
• 全文大小：430K
• ISSN：1932-7455

文摘

Plasmonic Ag nanopillars have been fabricated and used as a surface-enhanced Raman scattering (SERS) substrate. The effective surface area of the sample is determined using underpotential deposition (UPD) of thallium and agrees well with a geometrical calculation using ImageJ analysis of SEM images. In order to find the SERS enhancement factor (SEF), a similar sample is coated with Pt, which shows no plasmon response at the excitation wavelength of 532 nm. SEF values on the order of 10⁵ are obtained for Ag nanopillar substrates. Several monolayers of C₆₀ were deposited on these Ag nanopillars, and the Raman spectral results indicate charge delocalization at the interface between C₆₀ and Ag. FDTD simulation of the electric field confirms the experimental results; on the basis of these simulations, the electric field modulates with increasing diameter of the pillars, while the pitch (center-to-center distance) is fixed at 200 nm.