Arrayed Force Sensors Made of Paper, Elastomer, and Hydrogel Particles

Area of Science:

• Materials Science
• Sensor Technology
• Soft Robotics

Background:

• Developing advanced tactile sensors is crucial for applications in robotics and wearable technology.
• Existing sensors often face limitations in sensitivity, flexibility, and biocompatibility.

Purpose of the Study:

• To present a novel force-sensing array with enhanced sensitivity.
• To investigate the use of hydrogel-embedded elastomer for improved capacitive sensing.

Main Methods:

• Fabrication of a nine-button sensor array with a hydrogel-infused elastomer layer on patterned metallized paper.
• Utilizing an array of interdigitated capacitive sensing units beneath deformable hemispherical elements.
• Electromechanical characterization to assess force-sensing capabilities and sensitivity.

Main Results:

• The hydrogel-filled elastomer demonstrated significantly higher sensitivity (23.4 pF/N) compared to elastomer alone (3.4 pF/N).
• Hydrogel incorporation reduced the effective elastic modulus by a factor of seven, enhancing deformation and capacitance changes.
• The sensor array effectively detected pressure distribution through changes in capacitance.

Conclusions:

• The developed force-sensing array shows high sensitivity and potential for integration into wearable devices and soft robotics.
• Hydrogel-enhanced elastomer offers a promising approach for creating more sensitive and adaptable soft sensors.