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

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. In this paper, 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 0.2Fe 2.8O 4 and plasmonic Au nanocrystals. The superparamagnetism of Zn 0.2Fe 2.8O 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. Finally, the combined superparamagnetic and plasmonic functions enable switching of the infrared transmission of a hybrid nanorod suspension using an external magnetic field.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [5] ;  [4] ;  [2] ;  [3] ;  [6] ; ORCiD logo [7] ;  [8] ; ORCiD logo [9] ;  [10] ;  [11] ;  [6]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Electrical and Systems Engineering. Dept. of Materials Science and Engineering. Dept. of Chemistry; The Nature Conservancy, Arlington, VA (United States)
  2. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering
  3. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Electrical and Systems Engineering
  4. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Chemistry
  5. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering. Dept. of Chemistry; The Nature Conservancy, Arlington, VA (United States)
  6. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Electrical and Systems Engineering. Dept. of Materials Science and Engineering. Dept. of Chemistry
  7. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
  8. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Physics and Astronomy
  9. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Electrical and Systems Engineering. Dept. of Materials Science and Engineering. Dept. of Physics and Astronomy. Dept. of Bioengineering
  10. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering; Univ. of California, Santa Barbara, CA (United States). Materials Dept.
  11. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering. Dept. of Chemistry
Publication Date:
Report Number(s):
BNL-113988-2017-JA
Journal ID: ISSN 1748-3387; KC0403020
Grant/Contract Number:
SC0001004; SC0008135; AC02-98CH10886; FA9550-14-1-0389; NSF-561658; DMR-1120901; DGE-1321851
Type:
Accepted Manuscript
Journal Name:
Nature Nanotechnology
Additional Journal Information:
Journal Volume: 12; Journal Issue: 3; Journal ID: ISSN 1748-3387
Publisher:
Nature Publishing Group
Research Org:
Univ. of Pennsylvania, Philadelphia, PA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); Nature Conservancy (United States)
Contributing Orgs:
The Nature Conservancy, Arlington, VA (United States); Univ. of California, Santa Barbara, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Magnetic properties and materials; Metamaterials; Nanoparticles; Structural properties
OSTI Identifier:
1368666