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Tailoring Plasmonic Fields with Shape-Controlled Single-Crystal Gold Metasurfaces.

Sasan V Grayli1,2, Xin Zhang3, Dmitry Star3,4,5

  • 1Department of Electrical & Computer Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.

ACS Applied Materials & Interfaces
|June 27, 2024
PubMed
Summary

Researchers developed a new method for creating precisely shaped, single-crystal gold nanostructures. This breakthrough allows for tailored optical properties and enhanced plasmonic effects, paving the way for improved optical, photocatalytic, and sensory applications.

Keywords:
metasurfacesplasmonicsshape-controlsingle-crystal metalssurface-enhanced Raman spectroscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Crystalline geometry dictates optical responses and plasmonic fields in metallic nanostructures.
  • Controlling nanostructure shape and position is crucial for harnessing their optical properties but remains challenging.
  • Existing methods struggle to precisely tailor the geometry and placement of crystalline metal nanostructures.

Purpose of the Study:

  • To develop a solution deposition method for creating shape-controlled, single-crystal plasmonic gold nanostructures.
  • To investigate the influence of anionic additives on gold nanostructure morphology and crystallography.
  • To demonstrate the fabrication of tailored plasmonic metasurfaces with controlled geometry and location.

Main Methods:

  • Solution deposition of gold onto Ag(100) and Au(100) substrates in the presence of anionic additives (sulfate and halides).
  • Utilizing specific additives (SO4^2-, Cl^-, Br^-) to control crystallographic facets and surface morphology (e.g., square pyramids, hillocks, platelets).
  • Integration with lithographic patterning for precise geometric and location control of nanostructures.

Main Results:

  • Achieved shape-controlled, single-crystal gold nanostructures with defined facets (e.g., Au(111), Au(100), Au(110)).
  • Demonstrated that sulfate ions yield smooth Au(111)-faceted square pyramids with significant plasmonic Raman enhancement.
  • Showcased halide additives producing textured hillocks or platelets, and specific additive combinations yielding Au(110)-faceted square pyramids.
  • Fabricated single-crystal gold metasurfaces with tailored optical responses, exhibiting Raman scattering enhancements superior to randomly disposed structures.

Conclusions:

  • The developed solution deposition method enables precise control over the geometry and crystallography of single-crystal plasmonic gold nanostructures.
  • Anionic additives are key to directing nanostructure morphology, leading to predictable optical and plasmonic properties.
  • Tailored single-crystal plasmonic metasurfaces offer significant potential for enhancing optical, photocatalytic, and sensory functionalities.