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Levin CS, Hofmann C, Ali TA, Kelly AT, Morosan E, Nordlander P, Whitmire KH, Halas NJ. Magnetic-plasmonic core-shell nanoparticles. ACS NANO 2009; 3:1379-88. [PMID: 19441794 PMCID: PMC4108303 DOI: 10.1021/nn900118a] [Citation(s) in RCA: 197] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
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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Affiliation(s)
- Carly S. Levin
- Department of Chemistry, Rice University, P.O. Box 1892, Houston, Texas, 77251-1892
| | - Cristina Hofmann
- Department of Chemistry, Rice University, P.O. Box 1892, Houston, Texas, 77251-1892
| | - Tamer A. Ali
- Department of Electrical and Computer Engineering, Rice University, P.O. Box 1892, Houston, Texas, 77251-1892
| | - Anna T. Kelly
- Department of Chemistry, Rice University, P.O. Box 1892, Houston, Texas, 77251-1892
| | - Emilia Morosan
- Department of Physics and Astronomy, Rice University, P.O. Box 1892, Houston, Texas, 77251-1892
| | - Peter Nordlander
- Department of Physics and Astronomy, Rice University, P.O. Box 1892, Houston, Texas, 77251-1892
- Department of Electrical and Computer Engineering, Rice University, P.O. Box 1892, Houston, Texas, 77251-1892
| | - Kenton H. Whitmire
- Department of Chemistry, Rice University, P.O. Box 1892, Houston, Texas, 77251-1892
| | - Naomi J. Halas
- Department of Chemistry, Rice University, P.O. Box 1892, Houston, Texas, 77251-1892
- Department of Electrical and Computer Engineering, Rice University, P.O. Box 1892, Houston, Texas, 77251-1892
- Corresponding Author:
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