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Author Spotlight: Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing
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Paintable Silicone-Based Corrugated Soft Elastomeric Capacitor for Area Strain Sensing.

Han Liu1, Simon Laflamme1,2, Matthias Kollosche1,3

  • 1Department of Civil, Construction, and Environmental Engineering, Iowa State University, Ames, IA 50011, USA.

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|July 14, 2023
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Summary
This summary is machine-generated.

A new paintable soft elastomeric capacitor (cSEC) sensor was developed using silicone, enabling direct application for structural health monitoring. This advancement overcomes limitations of previous epoxy-based sensors, offering a more versatile solution for flexible electronics.

Keywords:
compositeflexible sensorlarge area electronicspolymersiliconesoft elastomeric capacitorstrainstretchable sensorstructural health monitoring

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Electrical Engineering

Background:

  • Soft polymer materials are crucial for developing compliant machines and devices, particularly in flexible and stretchable electronics.
  • Large-area electronics (LAE) based on soft polymers are explored for structural health monitoring (SHM) applications, requiring sensors that can conform to various surfaces and detect deformations.
  • Previous work introduced a corrugated soft elastomeric capacitor (cSEC) using styrene-ethylene-butadiene-styrene (SEBS), but its reliance on epoxy for bonding limited its deployment.

Purpose of the Study:

  • To develop a paintable corrugated soft elastomeric capacitor (cSEC) sensor.
  • To create a solvent-free fabrication method for cSEC sensors suitable for direct application.
  • To evaluate the performance of the new paintable silicone-based cSEC and compare it with the established SEBS-based cSEC.

Main Methods:

  • A solvent-free fabrication method was employed using a room-temperature-vulcanizing silicone as the host matrix.
  • Titania particles were incorporated into the silicone to form the dielectric layer, and carbon black was used for conductive stretchable electrodes.
  • The sensor was applied by painting the silicone onto a surface, followed by deposition of the parallel plate capacitor structure.

Main Results:

  • The painted silicone-cSEC exhibited good electromechanical behavior with high linearity (R2 = 0.9901), a gauge factor of 1.58, and a resolution of 70 με.
  • Performance comparison with the SEBS-cSEC on a cantilever plate showed comparable results, though the silicone paint introduced more noise and a slight under-estimation of dominant frequency.
  • The study demonstrated the feasibility of a paintable sensor for SHM, overcoming the limitations of solvent-based fabrication and epoxy bonding.

Conclusions:

  • The developed paintable silicone-cSEC offers a promising alternative for structural health monitoring applications, enabling easier deployment on complex surfaces.
  • While performance is comparable to existing technologies, further research may be needed to mitigate noise and frequency under-estimation issues associated with the silicone paint.
  • This advancement paves the way for more accessible and versatile large-area electronics in structural health monitoring and other fields requiring flexible sensors.