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Magnesium Nanoparticle Plasmonics.

John S Biggins1, Sadegh Yazdi, Emilie Ringe2,3

  • 1Department of Engineering , University of Cambridge , Trumpington Street , Cambridge CB2 1PZ , United Kingdom.

Nano Letters
|May 18, 2018
PubMed
Summary
This summary is machine-generated.

Earth-abundant magnesium nanoparticles exhibit localized surface plasmon resonances (LSPRs) across the UV-vis-NIR spectrum. These stable, inexpensive nanoparticles offer a versatile new material for nanoplasmonics applications.

Keywords:
Metal nanoparticleselectron-energy loss spectroscopylocalized surface plasmon resonancemagnesiumplasmonics

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Plasmonics

Background:

  • Noble metal nanoparticles (e.g., Cu, Ag, Au) exhibit localized surface plasmon resonances (LSPRs) driven by light.
  • Current plasmonic materials are costly and have limited resonant frequency ranges.
  • Aluminum nanoparticles are earth-abundant but lack infrared resonance.

Purpose of the Study:

  • To report earth-abundant magnesium (Mg) nanoparticles that overcome the limitations of current plasmonic materials.
  • To demonstrate Mg nanoparticles with LSPRs spanning the UV-visible-near-infrared (NIR) spectrum.

Main Methods:

  • Colloidal synthesis of Mg nanoparticles, resulting in hexagonal nanoplates.
  • Characterization of nanoparticle stability in solution and air.
  • Optical scattering spectroscopy to observe LSPRs.
  • Electron energy loss spectroscopy (EELS) and simulations to analyze resonances.
  • Numerical methods to study mode symmetry and substrate interactions.

Main Results:

  • Mg nanoparticles form stable, hexagonal nanoplates with a self-limiting oxide layer.
  • LSPRs are observable in the far-field via optical scattering.
  • Multiple size-dependent resonances are detected across UV, visible, and IR ranges.
  • Simulations confirm mode symmetries and substrate interactions.

Conclusions:

  • Colloidally synthesized Mg nanoparticles provide an inexpensive and stable alternative for nanoplasmonics.
  • Mg nanoparticles exhibit novel shapes and broad spectral resonances (UV-vis-NIR).
  • These nanoparticles represent a flexible addition to the nanoplasmonics toolbox.