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Related Experiment Video

Updated: Jul 16, 2025

Large Area Substrate-Based Nanofabrication of Controllable and Customizable Gold Nanoparticles Via Capped Dewetting
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Dual-Dewetting Process for Self-Assembled Nanoparticle Clusters in Wafer Scale.

Minjun Kim1, Hyun-Ju Ahn1, Vanna Chrismas Silalahi1

  • 1Department of Physics, Chungnam National University, Daejeon 34134, Republic of Korea.

International Journal of Molecular Sciences
|September 9, 2023
PubMed
Summary

We developed a lithography-free dual-dewetting method for fabricating large-area plasmonic molecules. This efficient self-assembly technique enhances light-matter interactions, significantly boosting signal intensity for applications like surface-enhanced Raman scattering.

Keywords:
dewetting precesselectric field enhancementplasmonic moleculesself-assembled nanoparticle

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Optics

Background:

  • Plasmonic molecules, or nanoparticle clusters, enhance light-matter interactions.
  • Existing fabrication methods like lithography are costly and limit scalability.
  • Precise nanoparticle positioning is crucial for strong electric field enhancement.

Purpose of the Study:

  • To develop a cost-effective, scalable fabrication method for plasmonic molecules.
  • To control the size and density of gold nanoparticles using a novel self-assembly process.
  • To demonstrate the enhanced optical properties of plasmonic molecules fabricated with the new method.

Main Methods:

  • A lithography-free, self-assembly approach termed the dual-dewetting process was employed.
  • This involved sequential deposition and thermal annealing of gold thin films on a substrate.
  • The process allowed for controlled gold nanoparticle formation, size, and density across a 6-inch wafer.

Main Results:

  • The dual-dewetting method produced a uniform distribution of gold nanoparticle size and density.
  • Particle density was significantly increased compared to single dewetting.
  • Surface-enhanced Raman scattering signal intensity showed a 30-fold increase after dual-dewetting with an 8 nm film.

Conclusions:

  • The dual-dewetting process offers a simple, efficient, and scalable method for large-area plasmonic molecule fabrication.
  • This technique facilitates enhanced light-matter interactions for various plasmonic applications.
  • The approach overcomes the limitations of high-cost lithography for producing advanced plasmonic materials.