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Related Experiment Videos

Bend, stretch, and touch: Locating a finger on an actively deformed transparent sensor array.

Mirza Saquib Sarwar1, Yuta Dobashi1, Claire Preston1

  • 1Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, British Columbia V6T1Z4, Canada.

Science Advances
|March 28, 2017
PubMed
Summary

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Researchers developed new transparent, stretchable touch sensors using hydrogel electrodes. These sensors can detect finger proximity and touch even during bending and stretching, enabling advanced wearable devices.

Area of Science:

  • Materials Science
  • Electronics
  • Sensors

Background:

  • Bendable, stretchable, and transparent touch sensors are crucial for electronic skin, wearables, and flexible devices.
  • Existing transparent sensors (metal mesh, carbon nanotubes, silver nanowires) have limitations in sensing modes during deformation.

Purpose of the Study:

  • To develop a novel transparent touch sensor technology capable of detecting finger proximity and touch during bending and stretching.
  • To utilize stretchable, ionically conductive hydrogel electrodes for enhanced sensing capabilities.

Main Methods:

  • Fabrication of polyacrylamide hydrogel electrodes embedded in silicone, a low-cost, transparent, and stretchable material.
  • Development of a three-step manufacturing technique suitable for large-area fabrication.
Keywords:
Flexible Electronicscapacitiveflexible touch sensorhydrogelproximitystretchabletouch sensortransparentwearable

Related Experiment Videos

  • Demonstration using a 4x4 cross-grid sensor array with a 5-mm pitch.

    • Main Results:

    • The sensor successfully detects finger proximity up to several centimeters above the array.
    • Light touch is registered as a 15% localized decrease in capacitance.
    • The sensor tracks finger movement, identifies multiple fingers, and maintains functionality during bending and stretching.

    Conclusions:

    • The hydrogel-based capacitive sensor offers a versatile platform for proximity, touch, and pressure sensing in flexible and wearable applications.
    • The manufacturing process is scalable and cost-effective, paving the way for widespread adoption.