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Conformable Wearable Electrodes: From Fabrication to Electrophysiological Assessment
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Electrowetting on paper for electronic paper display.

Duk Young Kim1, Andrew J Steckl

  • 1Nanoelectronics Laboratory, Department of Electrical and Computer Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0030, USA.

ACS Applied Materials & Interfaces
|October 27, 2010
PubMed
Summary

Researchers developed low-cost electrowetting (EW) devices on paper substrates. These paper-based EW devices show performance comparable to glass, enabling flexible electronic paper applications.

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Area of Science:

  • Materials Science
  • Surface Science
  • Device Physics

Background:

  • Paper's flexibility, versatility, and low cost make it attractive for device fabrication.
  • Electrowetting (EW) is a technique to manipulate liquid droplets on surfaces using electric fields.

Purpose of the Study:

  • To demonstrate the feasibility of fabricating EW devices on paper substrates.
  • To investigate the key paper properties influencing EW device performance.
  • To evaluate the performance characteristics of paper-based EW devices.

Main Methods:

  • Investigated various paper types, considering surface coating, roughness, thickness, and water uptake.
  • Fabricated EW devices on selected paper substrates.
  • Measured water contact angle (CA) changes with applied voltage in an oil ambient.
  • Assessed hysteresis and switching times of the paper-based EW devices.

Main Results:

  • EW devices were successfully fabricated on paper substrates.
  • Paper properties like surface coating and roughness were found to be critical.
  • Paper-based EW devices exhibited a large CA change (90-95°) in oil.
  • Negligible hysteresis (around 2°) and fast switching times (around 20 ms) were observed.

Conclusions:

  • Paper is a viable and promising substrate for fabricating EW devices.
  • Paper-based EW devices demonstrate performance comparable to conventional glass-based devices.
  • These findings suggest potential for low-cost, video-rate flexible e-paper applications.