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Related Concept Videos

Capillary Electrophoresis: Instrumentation01:20

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Highly conductive, printable pastes from capillary suspensions.

Monica Schneider, Erin Koos, Norbert Willenbacher

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    |August 11, 2016
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    Summary

    We developed novel conductive pastes using capillary suspension, eliminating organic additives for enhanced printed electronics. This innovation improves conductivity and enables precise printing for applications like solar cells.

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    Area of Science:

    • Materials Science
    • Colloid and Surface Chemistry
    • Printed Electronics

    Background:

    • Traditional conductive pastes for printed electronics often rely on non-volatile organic additives.
    • These additives can negatively impact the electrical properties and long-term stability of printed components.
    • A need exists for advanced paste formulations that overcome these limitations.

    Purpose of the Study:

    • To design novel conductive pastes for printed electronics utilizing the capillary suspension phenomenon.
    • To eliminate the need for detrimental organic additives in paste formulations.
    • To enhance the electrical conductivity and printability of conductive layers.

    Main Methods:

    • Utilized the capillary suspension phenomenon by adding a second immiscible fluid to particle suspensions.
    • Controlled microstructure through capillary forces to tune rheological properties (yield stress, low-shear viscosity).
    • Investigated shear-thinning behavior for compatibility with conventional printing equipment.

    Main Results:

    • Achieved tunable flow behavior and microstructure via capillary force control.
    • Enabled high aspect ratios and narrow line widths with inhibited sedimentation.
    • Produced high-purity silver and nickel layers with conductivity twice that of commercial materials.
    • Demonstrated complete evaporation of the secondary fluid during drying and sintering.

    Conclusions:

    • Capillary suspensions offer a paradigm shift in paste formulation for printed electronics.
    • This method allows for the creation of highly conductive, stable pastes without organic additives.
    • The technology is applicable to various conductive particles and printed electronic systems.