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Harnessing Multiple Surface Deformation Modes for Switchable Conductivity Surfaces.

Tetsu Ouchi1, Ryan C Hayward1

  • 1Department of Polymer Science and Engineering , University of Massachusetts Amherst , Amherst , Massachusetts 01003 , United States.

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Summary
This summary is machine-generated.

This study presents a novel method to control surface deformation modes like wrinkles, creases, and cracks in multilayer films. This allows for the creation of mechanically gated electrical switches and logic gates with tunable properties.

Keywords:
crackingelastic materialsflexible electronicspatterned surfacessurface instabilities

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Surface Science

Background:

  • Surface deformation modes (wrinkling, creasing, cracking) are crucial for flexible and stretchable electronics.
  • Precise control over these deformation modes is essential for advanced applications.
  • Existing methods often lack the ability to simultaneously control multiple deformation types.

Purpose of the Study:

  • To demonstrate a method for simultaneously controlling wrinkles, creases, and cracks in patterned multilayer films.
  • To enable the precise patterning and spatial localization of these surface deformation modes.
  • To develop mechanically gated electrical switches and logic gates using these controlled deformations.

Main Methods:

  • Patterned multilayer films were fabricated with metal coatings on stiff films and bare elastomer regions.
  • Mechanical loading was applied to induce controlled wrinkling, creasing, and cracking.
  • The formation and properties of patterned cracks were analyzed.
  • Mechanically gated electrical switches and logic gates were constructed and tested.

Main Results:

  • Simultaneous harnessing of wrinkles, creases, and cracks in patterned multilayer films was achieved.
  • Patterned cracks were straight, controllable over long distances, and exhibited tunable lateral spacings (micrometers to centimeters).
  • Reversible crack opening/closing enabled mechanically gated electrical switches with tunable critical switching strains (0.05-0.18) and high on/off ratios (>10^7).
  • Mechanical NAND and NOR logic gates were successfully fabricated using these switches.

Conclusions:

  • The developed method offers precise control over multiple surface deformation modes for advanced material design.
  • The patterned cracks and mechanically gated switches pave the way for novel electronic devices and sensors.
  • This approach enables the integration of complex logic functions onto flexible elastomer surfaces.