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Engineered SERS substrates with multiscale signal enhancement: nanoparticle cluster arrays.
ACS Nano. 2009 May 26; 3(5):1190-202.AN

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.

Authors+Show Affiliations

Department of Chemistry, Boston University, Boston, Massachusetts 02215, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

19354266

Citation

Yan, Bo, et al. "Engineered SERS Substrates With Multiscale Signal Enhancement: Nanoparticle Cluster Arrays." ACS Nano, vol. 3, no. 5, 2009, pp. 1190-202.
Yan B, Thubagere A, Premasiri WR, et al. Engineered SERS substrates with multiscale signal enhancement: nanoparticle cluster arrays. ACS Nano. 2009;3(5):1190-202.
Yan, B., Thubagere, A., Premasiri, W. R., Ziegler, L. D., Dal Negro, L., & Reinhard, B. M. (2009). Engineered SERS substrates with multiscale signal enhancement: nanoparticle cluster arrays. ACS Nano, 3(5), 1190-202. https://doi.org/10.1021/nn800836f
Yan B, et al. Engineered SERS Substrates With Multiscale Signal Enhancement: Nanoparticle Cluster Arrays. ACS Nano. 2009 May 26;3(5):1190-202. PubMed PMID: 19354266.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Engineered SERS substrates with multiscale signal enhancement: nanoparticle cluster arrays. AU - Yan,Bo, AU - Thubagere,Anupama, AU - Premasiri,W Ranjith, AU - Ziegler,Lawrence D, AU - Dal Negro,Luca, AU - Reinhard,Björn M, PY - 2009/4/10/entrez PY - 2009/4/10/pubmed PY - 2010/1/5/medline SP - 1190 EP - 202 JF - ACS nano JO - ACS Nano VL - 3 IS - 5 N2 - 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. SN - 1936-086X UR - https://www.unboundmedicine.com/medline/citation/19354266/Engineered_SERS_substrates_with_multiscale_signal_enhancement:_nanoparticle_cluster_arrays_ L2 - https://doi.org/10.1021/nn800836f DB - PRIME DP - Unbound Medicine ER -