High-strength magnetically switchable plasmonic nanorods assembled from a binary nanocrystal mixture.

Autor: Zhang M; Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; The Nature Conservancy, Arlington, Virginia 22203, USA., Magagnosc DJ; Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA., Liberal I; Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA., Yu Y; Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA., Yun H; Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA., Yang H; Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; The Nature Conservancy, Arlington, Virginia 22203, USA., Wu Y; Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA., Guo J; Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA., Chen W; Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA., Shin YJ; Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA., Stein A; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA., Kikkawa JM; Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA., Engheta N; Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA., Gianola DS; Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Materials Department, University of California Santa Barbara, Santa Barbara, California 93106, USA., Murray CB; Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA., Kagan CR; Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.; Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Jazyk: angličtina
Zdroj: Nature nanotechnology [Nat Nanotechnol] 2017 Mar; Vol. 12 (3), pp. 228-232. Date of Electronic Publication: 2016 Nov 07.
DOI: 10.1038/nnano.2016.235
Abstrakt: Next-generation 'smart' nanoparticle systems should be precisely engineered in size, shape and composition to introduce multiple functionalities, unattainable from a single material. Bottom-up chemical methods are prized for the synthesis of crystalline nanoparticles, that is, nanocrystals, with size- and shape-dependent physical properties, but they are less successful in achieving multifunctionality. Top-down lithographic methods can produce multifunctional nanoparticles with precise size and shape control, yet this becomes increasingly difficult at sizes of ∼10 nm. Here, we report the fabrication of multifunctional, smart nanoparticle systems by combining top-down fabrication and bottom-up self-assembly methods. Particularly, we template nanorods from a mixture of superparamagnetic Zn 0.2 Fe 2.8 O 4 and plasmonic Au nanocrystals. The superparamagnetism of Zn 0.2 Fe 2.8 O 4 prevents these nanorods from spontaneous magnetic-dipole-induced aggregation, while their magnetic anisotropy makes them responsive to an external field. Ligand exchange drives Au nanocrystal fusion and forms a porous network, imparting the nanorods with high mechanical strength and polarization-dependent infrared surface plasmon resonances. The combined superparamagnetic and plasmonic functions enable switching of the infrared transmission of a hybrid nanorod suspension using an external magnetic field.
Databáze: MEDLINE
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