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Engineered SERS Substrates with Multiscale Signal Enhancement: Nanoparticle Cluster Arrays
Abstract
Defined nanoparticle cluster arrays (NCAs) with total lateral dimensions of up to 25.4 microm x 25.4 microm have been fabricated on top of a 10 nm thin gold film using template-guided self-assembly. This approach provides precise control of the structural parameters in the arrays, allowing a systematic variation of the average number of nanoparticles in the clusters (n) and the edge-to-edge separation (Lambda) between 1 < n < 20 and 50 nm < or = Lambda < or = 1000 nm, respectively. Investigations of the Rayleigh scattering spectra and surface-enhanced Raman scattering (SERS) signal intensities as a function of n and Lambda reveal direct near-field coupling between the particles within individual clusters, whose strength increases with the cluster size (n) until it saturates at around n = 4. Our analysis shows that strong near-field interactions between individual clusters significantly affect the SERS signal enhancement for edge-to-edge separations Lambda < 200 nm. The observed dependencies of the Raman signals on n and Lambda indicate that NCAs support a multiscale signal enhancement which originates from simultaneous inter- and intracluster coupling and |E|-field enhancement. The NCAs provide strong and reproducible SERS signals not only from small molecules but also from whole bacterial cells, which enabled a rapid spectral discrimination between three tested bacteria species: Escherichia coli, Bacillus cereus, and Staphylococcus aureus.
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Metadata
- Authors
- Yan, B., Thubagere, A., Premasiri, W. R., Ziegler, L. D., Dal Negro, L., & Reinhard, B. M.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-04-08
- Volume
- 3
- Issue
- 5
- Pages
- 1190-1202
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2118306365
- Cited by
- 384
- References
- 44
- FWCI
- 13.55
- Type
- journal article
- Language
- en
- Open access
- closed
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