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Magnetic Layer-by-Layer Assembly: From Linear Plasmonic Polymers to Oligomers.

Van Tan Tran1,2,3, Dong Kyu Lee2, Jeonghyo Kim1

  • 1Department of Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea.

ACS Applied Materials & Interfaces
|March 18, 2020
PubMed
Summary

Magnetic superparticles (SPs) assemble into high aspect ratio nanochains and tunable oligomers using a novel layer-by-layer method. This scalable technique enables advanced optical filters and devices.

Keywords:
colloidal oligomerlayer-by-layerlinear nanochainmagnetic field-induced assemblynanochain arrayplasmonic oligomer

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Colloidal Chemistry

Background:

  • One-dimensional nanostructures with controlled aspect ratios are crucial for diverse applications.
  • Existing assembly methods often lack scalability or precise control over nanostructure dimensions.

Purpose of the Study:

  • To introduce a scalable method for fabricating one-dimensional nanostructures with controllable aspect ratios.
  • To demonstrate the assembly of magnetic superparticles into linear nanochains and oligomers.
  • To explore the optical properties and potential applications of the fabricated nanostructures.

Main Methods:

  • Magnetic layer-by-layer assembly utilizing co-assistance of electrostatic and magnetic fields.
  • Fabrication of magnetic superparticles (SPs) from Fe3O4 or Ag@Fe3O4 composites.
  • Assembly of SPs into high aspect ratio linear nanochains (colloidal polymers) and low aspect ratio colloidal chains (oligomers) using binary mixtures.

Main Results:

  • Achieved large-area (55 mm × 25 mm) assembly of SPs into linear nanochains with aspect ratios up to 10^2.
  • Demonstrated tunable length colloidal oligomers (aspect ratios 2-15) from binary magnetic colloid mixtures.
  • Observed strong optical polarization effects in colloidal polymers due to geometrical anisotropy, suitable for optical filters.
  • Showcased modulated optical properties in oligomers by tuning their composition and length.

Conclusions:

  • Scalable fabrication of well-aligned, linear colloidal polymers and oligomers is feasible.
  • The developed method offers facile control over nanostructure dimensions and properties.
  • These nanostructures present opportunities for sensors, subwavelength waveguides, optical tweezers, and solar energy devices.