Multifunctional Woven Structure Operating as Triboelectric Energy Harvester, Capacitive Tactile Sensor Array, and...

Area of Science:

• Materials Science
• Wearable Technology
• Sensor Technology

Background:

• Developing integrated sensing and energy harvesting systems for wearable devices is crucial for self-powered electronics.
• Existing flexible sensors often lack multi-modal capabilities or integrated power generation.
• Textile-based electronics offer unique advantages in comfort and conformability for wearable applications.

Purpose of the Study:

• To develop a novel power-generating sensor array in a flexible and stretchable form factor.
• To integrate resistive strain sensors, capacitive tactile sensors, and a triboelectric energy harvester into a single platform.
• To implement the device using functional threads in a woven textile structure.

Main Methods:

• Fabrication of functional threads consisting of a hollow tube coated with silver nanowires and a conductive silver thread.
• Integration of functional threads into a 5x5 sensor cell array within a woven textile.
• Sensing touch force via capacitance between warp and weft threads.
• Detecting lateral strain via piezoresistivity of silver nanowire layers.
• Measuring energy harvesting performance under vertical force application.

Main Results:

• The device successfully integrates resistive strain sensing, capacitive tactile sensing, and triboelectric energy harvesting.
• Touch force is detected by measuring capacitance, and lateral strain by resistance changes.
• The triboelectric energy harvester achieved a maximum power of 201 μW and a power density of 0.48 W/m².
• The device is implemented in a 60x60 mm² flexible and stretchable woven textile.

Conclusions:

• A versatile, power-generating sensor array has been successfully demonstrated on a flexible textile platform.
• The integrated multi-modal sensing and energy harvesting capabilities open new avenues for self-powered wearable electronics.
• The proposed functional thread design and textile integration offer a scalable approach for advanced wearable systems.