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Lignin-Based Copper Nanoparticles for Green and Flexible Electronics.

María Salvador1,2, Antonio Santana-Otero1, Yilian Fernández-Afonso1

  • 1Instituto de Ciencia de Materiales de Madrid, ICMM/CSIC, C/Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain.

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|April 20, 2026
PubMed
Summary

This study introduces green synthesis of oxidation-resistant copper nanoparticles using lignin. These eco-friendly nanoparticles show excellent stability and conductivity for flexible electronics.

Keywords:
conductive nanoinkscopper nanoparticlesgreen synthesisligninmicrowave-assisted polyol synthesisoxidation resistanceprinted electronics

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Green Chemistry

Background:

  • Copper nanoparticles (Cu NPs) are a sustainable alternative to silver for conductive inks.
  • Postsynthesis oxidation hinders practical application of Cu NPs.
  • Existing methods often require inert atmospheres and hazardous reducing agents.

Purpose of the Study:

  • To develop a green, scalable synthesis for oxidation-resistant copper nanoparticles.
  • To utilize lignin as a capping and stabilizing agent.
  • To assess the stability and conductivity of the synthesized Cu NPs for flexible electronics.

Main Methods:

  • Microwave-assisted polyol synthesis using sodium hypophosphite as a reducing agent.
  • Lignin employed as a capping and stabilizing agent.
  • Characterization using structural and compositional analyses, and electrical conductivity tests.

Main Results:

  • Synthesis achieved in 5 minutes via microwave irradiation without inert atmosphere.
  • Lignin coating provided significant stability: 120 days in ethanol, 60 days in air.
  • High electrical conductivity achieved (up to 3.83 × 10^6 S/m), outperforming commercial references.

Conclusions:

  • Lignin-stabilized copper nanoparticles offer a green and scalable solution for oxidation resistance.
  • These nanoparticles demonstrate excellent stability and conductivity for applications in green and flexible electronics.
  • The developed method avoids hazardous reagents and inert atmospheres, enhancing sustainability.