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Updated: Jul 16, 2026
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Sensitivity Enhancement of Soft Capacitive Pressure Sensors Using a Solvent Evaporation-Based Porosity Control Technique
Published on: March 24, 2023
Gradient Porous PVA/CB Composites for High-Performance Flexible Piezoresistive Sensors
Changze Mei1,2, Tian Zhang3,4, Yong Zhang1,2
1State Key Laboratory of Advanced Glass Materials, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Polymers
|July 15, 2026
Summary
This study presents a gradient porous flexible pressure sensor using poly(vinyl alcohol)/carbon black (PVA/CB) composite. The novel design achieves high sensitivity and a wide working range for practical applications.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Flexible piezoresistive sensors face a sensitivity-versatility trade-off.
- Developing sensors with both high sensitivity and broad working range is crucial.
Purpose of the Study:
- To engineer a flexible piezoresistive sensor with enhanced sensitivity and working range.
- To investigate the effect of gradient porosity on sensor performance.
Main Methods:
- Fabrication of a gradient porous PVA/CB composite using a sugar-templating method.
- Design of a bilayer structure with distinct pore sizes for sequential deformation.
- Characterization of sensor performance under varying pressures.
Main Results:
- The gradient porous sensor achieved a sensitivity of -3.05 kPa⁻¹ within 0-20 kPa and maintained stability up to 120 kPa.
- Demonstrated superior performance in medium- and high-pressure ranges compared to uniform porous structures.
- Exhibited excellent repeatability, fast response, and stability over 1000 cycles.
Conclusions:
- The gradient porous design effectively overcomes the sensitivity-working range trade-off in flexible pressure sensors.
- The sugar-templating method offers a scalable and simple approach for fabricating high-performance sensors.
- The developed sensor shows promise for applications in respiration monitoring, vocal vibration detection, and motion sensing.
