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Updated: Aug 23, 2025

Author Spotlight: Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing

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Published on: March 17, 2023

Wearable Capacitive Pressure Sensor for Contact and Non-Contact Sensing and Pulse Waveform Monitoring.

Azmal Huda Chowdhury¹, Borzooye Jafarizadeh¹, Nezih Pala²

¹Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USA.

Molecules (Basel, Switzerland)

|October 27, 2022

Summary

This study presents a low-cost, highly sensitive flexible pressure sensor using a porous Polydimethylsiloxane (PDMS) and multiwalled carbon nanotube (MWCNT) composite. The sensor offers excellent stability and dual-mode sensing for diverse applications in electronics and healthcare.

Keywords:

MWCNT capacitive sensor heart rate monitor porous PDMS proximity sensing wearable pressure sensor

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Conformable Wearable Electrodes: From Fabrication to Electrophysiological Assessment

Conformable Wearable Electrodes: From Fabrication to Electrophysiological Assessment

Published on: July 22, 2022

Area of Science:

Materials Science
Electrical Engineering
Sensor Technology

Background:

Flexible pressure sensors are crucial for tactile sensing, physiological monitoring, and advanced electronics.
Commercialization is hindered by the trade-off between high sensitivity and fabrication cost.
Existing sensors often struggle to balance performance with affordability.

Purpose of the Study:

To develop a low-cost, high-sensitivity flexible capacitive pressure sensor.
To demonstrate a sacrificial template-assisted fabrication method.
To explore the sensor's dual-mode sensing capabilities for pressure and proximity.

Main Methods:

Fabrication of a capacitive sensor using a porous Polydimethylsiloxane (PDMS) dielectric layer.
Incorporation of multiwalled carbon nanotubes (MWCNTs) into the PDMS to enhance dielectric properties.
Utilizing a sacrificial template-assisted method for cost-effective manufacturing.

Main Results:

Achieved high sensitivity of 2.42 kPa^-1 and a low limit of detection of 1.46 Pa.
Demonstrated excellent stability over 9000 cycles, indicating reliability.
Exhibited simultaneous contact (pressure) and non-contact (proximity) sensing capabilities.

Conclusions:

The developed sensor offers a viable solution for high-performance, low-cost flexible pressure sensing.
The MWCNT-PDMS composite effectively enhances sensitivity.
Dual-mode sensing capability opens new avenues for integrated systems in robotics and gesture control.