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Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol Functionalization.

Maksym Stetsenko1,2, Tetiana Margitych3, Serhii Kryvyi2,4

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Summary
This summary is machine-generated.

This study explores gold nanoparticle assembly on silicon wafers. Cross-linking with HDT molecules promotes aggregate formation, but dimer plasmonic signals remain detectable despite aggregation.

Keywords:
1,6-hexanedithiolAPTESAuNPsaggregationdimersmorphologyopticsself-assemblysurface

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Surface Chemistry

Background:

  • Gold nanoparticles (AuNPs) exhibit unique optical properties crucial for plasmonics.
  • Controlling nanoparticle assembly on surfaces is key to tailoring their optical responses.
  • Silicon wafers functionalized with (3-aminopropyl)trimethoxysilane (APTES) provide a versatile platform for nanoparticle deposition.

Purpose of the Study:

  • To investigate the morphology and optical properties of gold nanoparticle assemblies on APTES-coated silicon wafers.
  • To understand the role of 1,6-hexanedithiol (HDT) in cross-linking gold nanoparticles and influencing aggregate formation.
  • To determine if aggregate formation hinders the detection of plasmonic effects from individual nanoparticles and dimers.

Main Methods:

  • Two-stage precipitation procedure for gold nanoparticle assembly.
  • Functionalization of precipitated nanoparticles with 1,6-hexanedithiol (HDT).
  • Characterization using X-ray reciprocal space maps, modulation polarimetry, and polarized light spectroscopy.

Main Results:

  • The first precipitation stage resulted in predominantly single AuNPs with few dimers/small aggregates.
  • The second precipitation stage, after HDT functionalization, led to a significant increase in larger aggregates (100 nm to >1 μm).
  • X-ray and polarimetry data showed distinct signals from single AuNPs and dimers, even with aggregate presence.
  • Optical spectroscopy did not differentiate between self-aggregated and HDT-cross-linked dimers.

Conclusions:

  • The uncompensated dipole moment of initial small aggregates likely drives further growth during the second precipitation.
  • The presence of larger AuNP aggregates does not impede the investigation of plasmonic effects in AuNP dimers.
  • HDT cross-linking and self-aggregation yield similar optical signals in dimers, suggesting plasmonic behavior is conserved.