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High-Resolution and High-Conductivity Electrodes via Two-Step Annealing-Enhanced Solvent-Free Patterning of Silver

Sangmok Kim1, Dong-Joon Won1, Dongwoo Yoo2,3

  • 1Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 37673, South Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|October 9, 2025
PubMed
Summary

This study presents a novel two-step annealing method for patterning silver nanoparticles (AgNPs) without solvents. This technique enables high-resolution, high-conductivity electrodes for advanced flexible electronics.

Keywords:
interfacial fusionpatterningsilver nanoparticles (AgNPs)sinteringsolvent‐free

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • High-performance flexible electronic devices require high-resolution and high-conductivity electrodes.
  • Silver nanoparticles (AgNPs) offer potential for conductive electrodes due to their constant percolation threshold.
  • Current AgNP patterning methods face challenges in achieving high density, quality, and efficiency.

Purpose of the Study:

  • To develop a facile, high-quality, and efficient solvent-free patterning technique for AgNPs.
  • To enhance the electrical conductivity and mechanical properties of AgNP electrodes.
  • To enable the fabrication of high-resolution electrodes for flexible electronic applications.

Main Methods:

  • Developed a two-step annealing process using a UV-curable pressure-sensitive adhesive (PSA) film.
  • First annealing step: Induces interfacial fusion and sinter bridge formation between AgNPs and PTFE-coated substrate.
  • Second annealing step: Infiltrates PSA into AgNP voids, creating mechanical interlocking upon UV curing.

Main Results:

  • Achieved solvent-free patterning of AgNPs with critical dimensions down to 10 µm and excellent pattern fidelity.
  • Enhanced electrical conductivity through sinter bridge formation and increased work of fracture via mechanical interlocking.
  • Demonstrated simultaneous complementary patterning on both rigid and flexible films in a single process.

Conclusions:

  • The developed two-step annealing method offers a highly efficient approach for AgNP electrode fabrication.
  • This technique is suitable for producing high-resolution, high-conductivity patterns for flexible electronics.
  • Applicable to devices like flexible heaters and capacitive sensor arrays.