Determining molecular orientation via single molecule SERS in a plasmonic nano-gap

Marshall, ARL, Stokes, J, Viscomi, FN, Proctor, JE, Gierschner, J, Bouillard, J-SG and Adawi, AM 2017, 'Determining molecular orientation via single molecule SERS in a plasmonic nano-gap' , Nanoscale, 9 (44) , pp. 17415-17421.

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Abstract

In this work, plasmonic nano-gaps consisting of a silver nanoparticle coupled to an extended silver film have been fully optimized for single molecule Surface-Enhanced Raman Scattering (SERS) spectroscopy. The SERS signal was found to be strongly dependent on the particle size and the molecule orientation with respect to the field inside the nano-gap. Using Finite Difference Time Domain (FDTD) simulations to complement the experimental measurements, the complex interplay between the excitation enhancement and the emission enhancement of the system as a function of particle size were highlighted. Additionally, in conjunction with Density Functional Theory (DFT), the well-defined field direction in the nano-gap enables to recover the orientation of individual molecules.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre (SIRC)
Journal or Publication Title: Nanoscale
Publisher: Royal Society of Chemistry
ISSN: 2040-3364
Related URLs:
Depositing User: JE Proctor
Date Deposited: 21 Nov 2017 14:28
Last Modified: 21 Nov 2017 15:59
URI: http://usir.salford.ac.uk/id/eprint/44389

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