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Local Electric Field Enhancement of Neighboring Ag Nanoparticles in Surface Enhanced Raman Scattering

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Abstract:

We used a simple low-temperature hydrothermal approach to synthesize Ag nanoparticles (NPs) and demonstrated their efficiency as organic molecule detectors in surface enhanced Raman Scattering (SERS). Using finite difference time domain simulation, we described an investigation on the distribution of electric fields amplitude of the neighboring Ag NPs. The enhanced electric field is confined at the interparticle gaps and the enhancement factor can be further increased with reducing the spacing between the NPs. The theoretical simulation demonstrated good consistency with the experimental measurement results, which predicts an electric fields amplitude enhancement of 115 at the center of NPs gap and an electromagnetic SERS enhancement of 108. The evidence of clear correlations between SERS enhancement and morphology distribution offer a route to develop more effective SERS substrates.

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Periodical:

Advanced Materials Research (Volumes 760-762)

Pages:

801-805

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.760-762.801

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Online since:

September 2013

Authors:

Chao Yue Deng, Gu Ling Zhang, Bin Zou, Hong Long Shi, Yu Jie Liang, Yong Chao Li, Jin Xiang Fu, Wen Zhong Wang

Keywords:

Electric Field, FDTD, Interparticle Gap, SERS

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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