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Updated: Jun 23, 2025

Sensitivity Enhancement of Soft Capacitive Pressure Sensors Using a Solvent Evaporation-Based Porosity Control Technique

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Published on: March 24, 2023

Optimizing Capacitive Pressure Sensor Geometry: A Design of Experiments Approach with a Computer-Generated Model.

Kiran Keshyagol¹, Shivashankarayya Hiremath^1,2, Vishwanatha H M³

¹Department of Mechatronics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India.

Sensors (Basel, Switzerland)

|June 19, 2024

Summary

This study optimized capacitive pressure sensors (CPSs) for touch buttons. A cylindrical dielectric design using PVDF and PDMS achieved high sensitivity and capacitance, advancing electronic sensor technology.

Keywords:

PDMS PVDF capacitive pressure sensor design of experiment dielectrics optimization sensitivity

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Area of Science:

Materials Science and Engineering
Electrical Engineering
Applied Physics

Background:

Capacitive pressure sensors (CPSs) are crucial for modern electronic interfaces.
Optimizing sensor design enhances performance in applications like touch buttons and e-skin.
Flexible materials like PDMS and PVDF offer potential for advanced sensor fabrication.

Purpose of the Study:

To design and optimize capacitive pressure sensors (CPSs) for integration into electronic touch buttons.
To investigate the impact of dielectric geometry and thickness on sensor performance.
To identify optimal sensor configurations for enhanced sensitivity and capacitance.

Main Methods:

Finite Element Method (FEM) for modeling dielectric geometries and analyzing capacitive/sensitivity parameters.
Design of Experiments (DoE) with statistical analysis to determine optimal sensor shapes.
Simulation of sensor performance under varying pressures (0-200 kPa) with different dielectric thicknesses.

Main Results:

A cylindrical dielectric shape was predicted as optimal for sensitivity.
A 0.1 mm dielectric layer thickness maximized sensitivity and capacitance.
At 200 kPa, the optimized sensor achieved 33.3 pF capacitance, 15.9 × 10^-12 J stored energy, and 0.468 pF/Pa sensitivity.

Conclusions:

The proposed CPS design demonstrates high efficacy for capacitive touch buttons and e-skin applications.
Optimized sensor geometry and thin dielectric layers are key to achieving superior performance.
This work contributes to advancements in flexible electronic sensor technology.