Magnetic Alignment for Plasmonic Control of Gold Nanorods Coated with Iron Oxide Nanoparticles.

Autor: Rizvi MH; Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA., Wang R; Leibniz-Institut für Polymerforschung Dresden e.V., Institute for Physical Chemistry and Polymer Physics, 01069, Dresden, Germany., Schubert J; Leibniz-Institut für Polymerforschung Dresden e.V., Institute for Physical Chemistry and Polymer Physics, 01069, Dresden, Germany., Crumpler WD; Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA., Rossner C; Leibniz-Institut für Polymerforschung Dresden e.V., Institute for Physical Chemistry and Polymer Physics, 01069, Dresden, Germany.; Dresden Center for Intelligent Materials (DCIM), Technische Universität Dresden, 01069, Dresden, Germany., Oldenburg AL; Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC, 27599, USA., Fery A; Leibniz-Institut für Polymerforschung Dresden e.V., Institute for Physical Chemistry and Polymer Physics, 01069, Dresden, Germany.; Chair for Physical Chemistry of Polymeric Materials, Technische Universität Dresden, 01062, Dresden, Germany., Tracy JB; Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2022 Oct; Vol. 34 (40), pp. e2203366. Date of Electronic Publication: 2022 Sep 01.
DOI: 10.1002/adma.202203366
Abstrakt: Plasmonic nanoparticles that can be manipulated with magnetic fields are of interest for advanced optical applications, diagnostics, imaging, and therapy. Alignment of gold nanorods yields strong polarization-dependent extinction, and use of magnetic fields is appealing because they act through space and can be quickly switched. In this work, cationic polyethyleneimine-functionalized superparamagnetic Fe 3 O 4 nanoparticles (NPs) are deposited on the surface of anionic gold nanorods coated with bovine serum albumin. The magnetic gold nanorods (MagGNRs) obtained through mixing maintain the distinct optical properties of plasmonic gold nanorods that are minimally perturbed by the magnetic overcoating. Magnetic alignment of the MagGNRs arising from magnetic dipolar interactions on the anisotropic gold nanorod core is comprehensively characterized, including structural characterization and enhancement (suppression) of the longitudinal surface plasmon resonance and suppression (enhancement) of the transverse surface plasmon resonance for light polarized parallel (orthogonal) to the magnetic field. The MagGNRs can also be driven in rotating magnetic fields to rotate at frequencies of at least 17 Hz. For suitably large gold nanorods (148 nm long) and Fe 3 O 4 NPs (13.4 nm diameter), significant alignment is possible even in modest (<500 Oe) magnetic fields. An analytical model provides a unified understanding of the magnetic alignment of MagGNRs.
(© 2022 The Authors. Advanced Materials published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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