Self-Powered Biomimetic Tactile Sensing with Broad Linear Range via Synchronous Mechano-Electrical Regulation

Area of Science:

• Materials Science
• Robotics
• Sensors and Transducers

Background:

• Mechano-potentiometric sensors offer sustained voltage for static mechanical stimuli, unlike piezoelectric and triboelectric sensors.
• Existing mechano-potentiometric sensors face challenges with narrow pressure ranges and poor linearity.
• Self-powered flexible pressure sensors are crucial for robotic tactile sensing and wearable applications.

Purpose of the Study:

• To develop a mechano-potentiometric transducer with an improved linear pressure sensing range.
• To address the limitations of narrow response range and poor linearity in current sensors.
• To create a self-powered sensor for advanced robotic tactile sensing and feedback control.

Main Methods:

• Fabrication of a mechano-potentiometric transducer utilizing an internal-cavity/microhemisphere-structured solid electrolyte.
• Synergistic mechano-electrical regulation to achieve a broad linear sensing range.
• Matrix scaling of the sensor for spatial pressure mapping and integration with a robotic gripper.

Main Results:

• Achieved a broad (0-350 kPa) and highly linear (1.66 mV kPa^-1, R² = 0.995) pressure sensing range.
• Demonstrated fast response (42.3 ms) and recovery (62.6 ms) with excellent repeatability (>10,000 cycles).
• Successfully enabled softness recognition of silicone samples (95.31% accuracy) and fruit softness-based grasping control.

Conclusions:

• The novel solid electrolyte structure provides a strategy for high-linearity, broad-range self-powered potentiometric sensors.
• The developed sensor significantly enhances tactile sensing capabilities for robotic applications.
• This technology facilitates advanced feedback control for robotic grippers based on object softness and applied force.