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Plasmonic Nanoparticle Arrays with Nanometer Separation for High-Performance SERS Substrates
Abstract
We demonstrate a method for fabricating arrays of plasmonic nanoparticles with separations on the order of 1 nm using an angle evaporation technique. Samples fabricated on thin SiN membranes are imaged with high-resolution transmission electron microscopy (HRTEM) to resolve the small separations achieved between nanoparticles. When irradiated with laser light, these nearly touching metal nanoparticles produce extremely high electric field intensities, which result in surface-enhanced Raman spectroscopy (SERS) signals. We quantify these enhancements by depositing a p-aminothiophenol dye molecule on the nanoparticle arrays and spatially mapping their Raman intensities using confocal micro-Raman spectroscopy. Our results show significant enhancement when the incident laser is polarized parallel to the axis of the nanoparticle pairs, whereas no enhancement is observed for the perpendicular polarization. These results demonstrate proof-of-principle of this fabrication technique. Finite difference time domain simulations based on HRTEM images predict an electric field intensity enhancement of 82400 at the center of the nanoparticle pair and an electromagnetic SERS enhancement factor of 10(9)-10(10).
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Cites
Optical Constants of the Noble Metals
Johnson, P. B., & Christy, R. W. (1972) · Physical Review B · doi:10.1103/physrevb.6.4370 · Cited by 20,094
Cited by
Plasmons in Strongly Coupled Metallic Nanostructures
Halas, N. J., Lal, S., Chang, W.-S., Link, S., & Nordlander, P. (2011) · Chemical Reviews · doi:10.1021/cr200061k · Cited by 3,135
SERS Nanoparticles in Medicine: From Label-Free Detection to Spectroscopic Tagging
Lane, L. A., Qian, X., & Nie, S. (2015) · Chemical Reviews · doi:10.1021/acs.chemrev.5b00265 · Cited by 873
Creating, characterizing, and controlling chemistry with SERS hot spots
Kleinman, S. L., Frontiera, R. R., Henry, A.-I., Dieringer, J. A., & Van Duyne, R. P. (2013) · Phys. Chem. Chem. Phys. · doi:10.1039/c2cp42598j · Cited by 733
Quantum Plasmonics: Nonlinear Effects in the Field Enhancement of a Plasmonic Nanoparticle Dimer
Marinica, D. C., Kazansky, A. K., Nordlander, P., Aizpurua, J., & Borisov, A. G. (2012) · Nano Letters · doi:10.1021/nl300269c · Cited by 484
Surface-Enhanced Infrared Spectroscopy Using Nanometer-Sized Gaps
Huck, C., Neubrech, F., Vogt, J., Toma, A., Gerbert, D., Katzmann, J., Härtling, T., & Pucci, A. (2014) · ACS Nano · doi:10.1021/nn500903v · Cited by 225
Metadata
- Authors
- Theiss, J., Pavaskar, P., Echternach, P. M., Muller, R. E., & Cronin, S. B.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2010-07-14
- Volume
- 10
- Issue
- 8
- Pages
- 2749-2754
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W1998625538
- Cited by
- 257
- References
- 1
- FWCI
- 8.24
- Type
- journal article
- Language
- en
- Open access
- closed
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- Theiss, J., Pavaskar, P., Echternach, P. M., Muller, R. E., & Cronin, S. B. (2010). Plasmonic Nanoparticle Arrays with Nanometer Separation for High-Performance SERS Substrates. Nano Letters. https://doi.org/10.1021/nl904170g
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