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Updated: Jun 19, 2026

Planar and Three-Dimensional Printing of Conductive Inks

Planar and Three-Dimensional Printing of Conductive Inks

Published on: December 9, 2011

Electrostatic Complexation of Conjugated and Bottlebrush Polyelectrolytes Forms Printable, Conductive Inks.

Intanon Lapkriengkri¹, Alexandra Zele¹, Hyunki Yeo²

¹Materials Department, University of California, Santa Barbara, California 93106, United States.

ACS Applied Materials & Interfaces

|January 9, 2026

Summary

Electrostatic complexation enables processing of immiscible polymers into conductive and stretchable materials. This study explores design rules for direct ink writing of functional polyelectrolyte complexes for organic electronics.

Keywords:

bottlebrush conjugated electrostatic complexes organic electronics polyelectrolyte printable stretchable

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Last Updated: Jun 19, 2026

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Area of Science:

Polymer Science
Materials Science
Organic Electronics

Background:

Polyelectrolyte complexation is key for blending immiscible polymers.
Liquid-liquid phase separation of oppositely charged polyelectrolytes yields processable polymer-dense phases.
Functional polyelectrolytes offer tunable electrical and mechanical properties.

Purpose of the Study:

To establish design rules for direct ink writing of electrostatic polyelectrolyte complexes.
To investigate the influence of charge fraction on compatibilization and properties.
To explore applications in organic electronics.

Main Methods:

Synthesis of water-soluble sulfonated conjugated polyelectrolytes (polythiophenes).
Complexation with bottlebrush polyelectrolytes.
Rheological analysis for direct ink writing (DIW) assessment.
Characterization of electrical, electromechanical, and adhesive properties.

Main Results:

Electrostatic complexation successfully compatibilized immiscible conjugated and bottlebrush polyelectrolytes.
Rheological properties enabled direct ink writing into thick, patterned structures.
Dried complexes exhibited sufficient electrical conductivity, stretchability, and adhesion.

Conclusions:

Direct ink writing of electrostatic polyelectrolyte complexes is feasible for fabricating thick semiconducting materials.
These materials hold promise for applications in bioelectronic sensors and conductive adhesives.
The study provides design guidelines for functional polyelectrolyte complex development.