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Conductive gold nanoparticle mirrors at liquid/liquid interfaces.

Ping-Ping Fang1, Shu Chen, Haiqiang Deng

  • 1Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne , Station 6, CH-1015 Lausanne, Switzerland.

ACS Nano
|September 20, 2013
PubMed
Summary
This summary is machine-generated.

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Gold nanoparticle (Au NP) mirrors achieve high reflectance and electrical conductance at liquid interfaces. Optimal performance occurs at monolayer coverage, indicating a percolation threshold for conductivity.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Gold nanoparticles (Au NPs) are investigated for their unique optical and electrical properties.
  • Self-assembly at liquid/liquid interfaces offers a novel route for creating functional nanomaterials.
  • Controlling nanoparticle arrangement is key to achieving desired material characteristics.

Purpose of the Study:

  • To investigate the self-assembly of gold nanoparticle (Au NP) films at a liquid/liquid interface.
  • To determine the relationship between Au NP surface coverage, reflectance, and electrical conductance.
  • To identify the critical surface coverage corresponding to the percolation threshold for conductivity.

Main Methods:

  • Self-assembly of Au NPs at a [heptane + 1,2-dichloroethane]/water liquid/liquid interface.

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  • Experimental measurement of film reflectance.
  • Finite difference time domain (FDTD) calculations for optical properties.
  • Scanning electrochemical microscopy (SECM) for electrical conductance mapping.

    • Main Results:

    • Au NP mirrors with high reflectance and electrical conductance were successfully self-assembled.
    • Maximum reflectance was achieved with 60 nm diameter Au NPs at approximate monolayer coverage.
    • SECM revealed a transition from insulating to conducting behavior at approximately monolayer surface coverage.
    • Reflectance and conductance changes correlated with exceeding the percolation threshold.

    Conclusions:

    • Self-assembled Au NP films at liquid interfaces can function as effective mirrors.
    • Monolayer surface coverage is critical for achieving both high reflectance and electrical conductivity.
    • The percolation threshold governs the transition to a conducting state in these nanoparticle films.