Journal
ACS NANO
Volume 3, Issue 6, Pages 1379-1388Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn900118a
Keywords
wustite nanocrystals; core-shell nanostructure; surface plasmon resonance; bifunctional; magnetic nanoshells
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Funding
- Keck Center Nanobiology Training Program of the Gulf Coast Consortia, NIH [1 T90 DK070121-01]
- National Science Foundation [EEC-0304097, EEC-0647452, CHE-0719396]
- AFOSR [F49620-03-C-0068]
- Robert A. Welch Foundation [C-1220, C-1222, C-0976]
- Multidisciplinary University Research Initiative (MURI) [W911 NF-04-01-0203]
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Nanoparticles composed of magnetic cores with continuous Au shell layers simultaneously possess both magnetic and plasmonic properties. Faceted and tetracubic nanocrystals consisting of wustite with magnetite-rich corners and edges retain magnetic properties when coated with a Au shell layer, with the composite nanostructures showing ferrimagnetic behavior. The plasmonic properties are profoundly influenced by the high dielectric constant of the mixed iron oxide nanocrystalline core. A comprehensive theoretical analysis that examines the geometric plasmon tunability over a range of core permittivities enables us to identify the dielectric properties of the mixed oxide magnetic core directly from the plasmonic behavior of the core-shell nanoparticle.
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