Anti-Leakage Iontronic Pressure Sensor with Gradient Microcone Structures for Multifunctional Monitoring

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Conventional iontronic pressure sensors face challenges in balancing sensitivity and linear range.
• Ionic leakage in current designs leads to undesirable signal drift, limiting performance.
• Developing stable and high-performance iontronic sensors is crucial for applications like electronic skins.

Purpose of the Study:

• To develop a highly effective anti-leakage iontronic pressure sensor.
• To improve the sensitivity, linear range, and stability of iontronic sensors.
• To demonstrate the sensor's utility in various real-world applications.

Main Methods:

• Fabrication of an iontronic sensor with a surface gradient microcone array.
• Immobilization of ionic liquids within a thermoplastic polyurethane matrix using chemical interactions.
• Optimization of additives and microstructural parameters for enhanced electromechanical properties.

Main Results:

• Achieved high sensitivity of 209 kPa^-1 over a wide linear range (10-200 kPa).
• Demonstrated an ultralow detection limit of 2 Pa and high-pressure resolution of 12 Pa.
• Exhibited a low signal drift rate of 4.6% over 3000 cycles, confirming anti-leakage performance.

Conclusions:

• The gradient microcone array design effectively mitigates ionic leakage and signal drift.
• The sensor offers a promising mechanochemical synergistic strategy for high-performance flexible pressure sensing.
• The developed sensor is suitable for diverse applications including physiological monitoring and microvibration detection.