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Updated: Jun 25, 2026

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Silica nanoparticle layer-by-layer assembly on gold.

Feng Wang1, Scott Peters, Jeff Guzda

  • 1Department of Chemical and Materials Engineering, Univesity of Cincinnati, Cincinnati, Ohio 45227, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 11, 2009
PubMed
Summary

Layer-by-layer assembly of silica nanoparticles controls wetting properties of gold-plated steel. This method enhances surface wettability while maintaining low electrical contact resistance for advanced material applications.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Controlling surface properties of electroplated gold on stainless steel is crucial for various applications.
  • Achieving desired wettability without compromising electrical contact resistance presents a significant challenge.

Purpose of the Study:

  • To investigate layer-by-layer (LBL) assembly of silica nanoparticles for tunable surface wetting.
  • To maintain low electrical surface contact resistance on gold-plated 316 L stainless steel.
  • To understand the influence of silica nanoparticle zeta potential on coating properties.

Main Methods:

  • Utilized layer-by-layer (LBL) assembly with silica nanoparticles and a cationic copolymer binder.
  • Varied silica nanoparticle zeta potential by adjusting pH and ethanol content.

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  • Measured coating thickness, wettability (contact angle), and electrical contact resistance.

    • Main Results:

    • Bilayer thickness increased with higher absolute zeta potential, achieving up to 82% of nanoparticle diameter.
    • Rapid nanoparticle adsorption occurred, with coverage equilibrating in 1 minute.
    • Contact angle reduced significantly, from 84° on bare substrate to as low as 7° after eight bilayers.
    • Electrical through-plane resistivity as low as 1.63 kΩ·cm was achieved.

    Conclusions:

    • LBL assembly of silica nanoparticles effectively controls surface wetting properties of gold-plated steel.
    • The study demonstrates a method to enhance wettability while preserving low electrical contact resistance.
    • Zeta potential is a critical parameter influencing LBL coating thickness and adsorption behavior.