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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

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Related Experiment Video

Updated: May 30, 2026

Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
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Attenuating surface plasmon resonance via core/alloy architectures.

Peter N Njoki1, Louis V Solomon, Wenjie Wu

  • 1Department of Chemistry, Syracuse University, Syracuse, New York, USA.

Chemical Communications (Cambridge, England)
|August 4, 2011
PubMed
Summary

Microwave irradiation facilitates layer-by-layer synthesis of gold/gold-palladium alloy nanoparticles. Surface plasmon resonance (SPR) and discrete dipole approximation (DDA) analysis revealed alloy shell growth and correlated it to particle morphology.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Physical Chemistry

Background:

  • Core/shell nanoparticles offer tunable properties.
  • Controlling alloy shell composition and thickness is crucial for tailored applications.
  • Microwave irradiation provides efficient and rapid heating for nanoparticle synthesis.

Purpose of the Study:

  • To describe the layer-by-layer synthesis of Au/Au(x)Pd(1-x) core/alloy nanoparticles.
  • To monitor alloy shell growth using surface plasmon resonance (SPR).
  • To correlate SPR signals with nanoparticle morphology via discrete dipole approximation (DDA).

Main Methods:

  • Layer-by-layer processing of nanoparticles.
  • Microwave irradiation (MWI) based hydrothermal heating.
  • Spectroscopic analysis of surface plasmon resonance (SPR).
  • Discrete dipole approximation (DDA) modeling.

Main Results:

  • Successful synthesis of Au/Au(x)Pd(1-x) core/alloy nanoparticles.
  • SPR peak attenuation directly correlated with increasing shell thickness and alloy composition.
  • DDA simulations accurately predicted SPR behavior based on particle morphology.

Conclusions:

  • MWI is an effective method for controlled synthesis of alloy shell nanoparticles.
  • SPR is a sensitive probe for monitoring shell growth and composition.
  • DDA provides a valuable tool for understanding nanoparticle structure-property relationships.