Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 19, Pages 9291-9305Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp2010309
Keywords
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Funding
- AFOSR/DARPA [BAA07-61 (FA9550-08-1-0221)]
- NSF [CHE-0414554, CHE-0911145, CHE-1025941]
- NSF Network for Computational Nanotechnology
- NSF MRSEC at the Materials Research Center of Northwestern University [DMR-0520513]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0911145] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1025941] Funding Source: National Science Foundation
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This article provides a review of our recent studies of single metal nanoparticles and single nanoparticle clusters aimed at correlating the structural and plasmonic properties of the same entity. The correlation between the structure and the optical properties arising from the localized surface plasmon resonance (LSPR) on single nanoparticles from various samples is described. Nanoparticles of different materials (Ag and Au) and shapes (spheres, cubes, triangles) are considered. Experiments were carried out using transmission electron microscopy (TEM), dark-field spectroscopy, and surface-enhanced Raman spectroscopy (SERS). Results of those measurements were compared with electrodynamics calculations to provide insight into the interpretation and physical meaning of the experimental results. We examine correlated studies of triangular nanoparticle arrays to highlight the significance of single entity measurements over ensemble-averaged measurements. Furthermore, we show how an examination of statistics on large data sets helps draw quantitative structure LSPR relationships. We also show that implementing SEAS in correlated measurements improves the understanding of factors important in determining SERS enhancements. Finally, we extend the scope of correlated measurements to the tracking and controlled manipulation of single nanoparticles, thus paving the way for in vivo diagnostics using nanomaterials.
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