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Gold Nanoparticle Synthesis
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Direct Synthesis of Gold Nanoparticles in Polymer Matrix.

Quang Truong Pham1, Gia Long Ngo1, Xuan An Nguyen1

  • 1LuMIn, ENS Paris-Saclay, CentraleSupélec, CNRS, Université Paris-Saclay, 91190 Gif-sur-Yvette, France.

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|January 8, 2023
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Summary

We developed a simple thermal method to create gold nanoparticles (Au NPs) within polymers. This technique allows tuning nanoparticle size and optical properties for various applications.

Keywords:
Au nanoparticlesnanocompositeplasmonicspolymer matrixthermal annealing

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Polymer-nanoparticle composites offer unique optical properties.
  • Controlling nanoparticle formation within matrices is challenging.
  • Gold nanoparticles (Au NPs) exhibit tunable plasmonic behavior.

Purpose of the Study:

  • To present a novel method for direct fabrication of gold nanoparticles (Au NPs) in a polymer matrix.
  • To investigate the plasmonic properties of these polymer-nanoparticle nanocomposites.
  • To explore the influence of fabrication parameters on Au NP characteristics and optical response.

Main Methods:

  • Polymer-nanoparticle nanocomposites were prepared by mixing SU-8 resist with gold salt.
  • Au NPs were formed in situ via thermal treatment in air.
  • Plasmonic properties were studied using absorption spectra and transmission electron microscopy (TEM).
  • A simulation model was developed to calculate plasmonic properties.

Main Results:

  • The thermal treatment successfully formed Au NPs within the SU-8 polymer matrix.
  • Concentration of gold salt, annealing temperature, and duration were found to be critical for tuning Au NP size and distribution.
  • Larger Au NPs (50-100 nm) significantly influenced absorption spectra, even at low relative concentrations.
  • TEM confirmed the presence, size, and distribution of Au NPs.

Conclusions:

  • A simple, low-cost, and reproducible thermal method enables direct fabrication of Au NPs in polymer thin films.
  • The optical properties of the nanocomposites can be effectively tuned by controlling Au NP characteristics.
  • This technique holds potential for large-scale applications in various fields requiring plasmonic materials.