Flexible Capacitive Pressure Sensor Based on a Double-Sided Microstructure Porous Dielectric Layer

Area of Science:

• Materials Science and Engineering
• Sensor Technology
• Nanotechnology

Background:

• Intelligent sensing demands highly sensitive flexible pressure sensors.
• Existing sensors often compromise on response range and resolution, limiting applications.
• Need for advanced flexible pressure sensors in robotics and prosthetics.

Purpose of the Study:

• To develop a flexible capacitive pressure sensor with enhanced sensitivity, response range, and resolution.
• To investigate the impact of microstructures and porous structures on sensor performance.
• To demonstrate the sensor's utility in large-area sensing and object recognition.

Main Methods:

• Fabrication of a porous dielectric layer using silicon rubber (SR)/NaCl/carbon black (CB) via dissolution.
• Creation of hemisphere microstructures on both sides of the dielectric layer using a template method.
• Characterization of the synergistic effects of micro/porous structures on dielectric layer deformability.

Main Results:

• Achieved high sensitivity of 3.15 kPa^-1.
• Demonstrated a wide pressure response range from 0 to 200 kPa.
• Attained high resolution with a minimum detectable pressure of 27 Pa.

Conclusions:

• The double-sided microstructure porous dielectric layer significantly enhances flexible pressure sensor performance.
• The developed sensor shows promise for applications requiring large-area pressure sensing, such as robot skin and intelligent prosthetic hands.
• Synergistic structural design is key to overcoming limitations in flexible pressure sensor technology.