Journal
CHEMICAL SCIENCE
Volume 2, Issue 8, Pages 1435-1439Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1sc00125f
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Funding
- MRSEC National Science Foundation at the Materials Research Center of Northwestern University [DMR-0520513]
- NSF NSEC at Northwestern University [EEC-0647560]
- David and Lucile Packard Foundation
- NIH [DP1OD003899]
- NSF-MRSEC
- NSF-NSEC
- Keck Foundation
- OFFICE OF THE DIRECTOR, NATIONAL INSTITUTES OF HEALTH [DP1OD003899] Funding Source: NIH RePORTER
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This Perspective reviews a new class of surface-enhanced Raman scattering (SERS) nanoparticle substrates defined by their three-dimensional (3D) confinement of localized electromagnetic fields. First, we describe the critical design parameters and recent advances in nanofabrication to create reproducible nanoparticle assemblies for SERS. Next, we highlight a promising platform-gold nanopyramids-for testing how the local arrangement of particles in an assembly affects the overall SERS response. The dimensions and optical properties of the nanopyramids can be tuned easily, and their unique anisotropic shape allows them to be organized into different particle configurations with 3D Raman-active volumes. Because of their large hot-spot volumes, this unique class of nanoparticle substrates offers an attractive alternative for ultra-sensitive sensors and trace chemical analysis.
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