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Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing

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A multi-component nanocomposite screen-printed ink with non-linear touch sensitive electrical conductivity.

Alexander J Webb¹, Marek Szablewski, David Bloor

¹Department of Physics, Durham University, South Road, Durham DH1 3LE, UK.

|March 29, 2013

Summary

This study introduces a novel screen-printed functional ink for advanced printable electronics. The ink demonstrates significant pressure-sensitive electrical properties, enabling sensitive touch surfaces and advanced sensing applications.

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Planar and Three-Dimensional Printing of Conductive Inks

Planar and Three-Dimensional Printing of Conductive Inks

Published on: December 9, 2011

Area of Science:

Materials Science
Nanotechnology
Electrical Engineering

Background:

Printable electronics offer significant commercial potential.
Developing functional inks with tailored electrical properties is crucial for advanced applications.
Existing composite systems may have limitations in sensitivity at low pressures.

Purpose of the Study:

To describe a novel screen-printed functional ink with pressure-sensitive electrical properties.
To investigate the performance of this ink for sensing and touch-sensitive surfaces.
To understand the conduction mechanisms, especially at low pressures.

Main Methods:

Formulation of a functional ink combining semiconducting acicular particles, insulating nanoparticles, and a polymer base.
Screen-printing technique for fabricating the functional material.
Electrical characterization including current-voltage measurements at varying pressures.

Main Results:

The developed ink exhibits pronounced and reproducible pressure-sensitive resistance.
Significant changes in resistance were observed down to 13 Pa applied pressure.
Conduction in the low-pressure regime is explained by field-assisted quantum mechanical tunneling.

Conclusions:

The novel functional ink is suitable for high-performance printable electronics, particularly for touch and sensing applications.
The unique ink composition leads to a broad and reliable pressure-sensitive resistance range.
Understanding the quantum mechanical tunneling mechanism is key to optimizing low-pressure sensitivity.