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Updated: Sep 25, 2025

Planar and Three-Dimensional Printing of Conductive Inks
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Silver-Copper Alloy Nanoinks for Ambient Temperature Sintering.

Richard Robinson1, Virginia Krause1, Shan Wang1

  • 1Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 27, 2022
PubMed
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Researchers developed a scalable method for creating silver-copper alloy nanoinks that sinter at room temperature. This innovation enables cost-effective, low-temperature fabrication of printed wearable electronics and sensors.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Electronics Engineering

Background:

  • Growing demand for reduced silver content in inks for cost-effective printed wearable electronics.
  • Need for low-temperature sintering processes for scalable and affordable production.
  • Alloying silver with copper offers a potential solution for cost reduction, but its controllability and sintering behavior require further investigation.

Purpose of the Study:

  • To develop a scalable wet chemical synthesis for bimetallic silver-copper alloy nanoinks.
  • To investigate the composition controllability and room temperature sintering properties of these nanoinks.
  • To explore the influence of humidity on the sintering process and its implications for wearable electronics.

Main Methods:

  • Scalable wet chemical synthesis of silver-copper alloy nanoparticles.

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  • Formulation of stable nanoinks from bimetallic nanoparticles.
  • Printing of nanoinks on paper substrates.
  • Room temperature sintering experiments and analysis of humidity effects.
  • Theoretical simulations of sintering mechanisms (surface-mediated sintering, interparticle necking).

    • Main Results:

    • Successful synthesis of bimetallic silver-copper alloy nanoinks with controllable composition.
    • Demonstration of room temperature sintering of printed nanoinks on paper substrates.
    • Observation of a significant dependence of sintering behavior on ambient humidity.
    • Theoretical validation of sintering mechanisms involving nanoscale adsorption, adhesion, diffusion, and surface free energies.

    Conclusions:

    • Scalable synthesis of tunable silver-copper alloy nanoinks enables room temperature sintering.
    • Humidity plays a critical role in the sintering process of these nanoinks.
    • The findings pave the way for low-cost, room temperature fabrication of printed wearable sensors.