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Pressure Gauges

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Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...

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Thermal Measurement Techniques in Analytical Microfluidic Devices

Thermal Measurement Techniques in Analytical Microfluidic Devices

Published on: June 3, 2015

Screen-Printable Iontronic Pressure Sensor with Thermal Expansion Microspheres for Pulse Monitoring.

Zekun Yang¹, Yunlong Zhao^2,3, Yihui Lan^2,3

¹Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, China.

ACS Applied Materials & Interfaces

|July 23, 2024

Summary

This study introduces thermally expandable microspheres for screen printing to create high-sensitivity flexible pressure sensors. This method simplifies fabrication and enhances sensor performance for applications like health monitoring.

Keywords:

flexible sensor ionic liquid iontronic pressure sensor pulse testing screen-printing thermally expandable microspheres

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Area of Science:

Materials Science
Nanotechnology
Sensor Technology

Background:

Improving flexible pressure sensor sensitivity is crucial for advanced applications.
Traditional microstructure fabrication methods hinder large-scale production, especially via screen printing.

Purpose of the Study:

To develop a scalable method for fabricating high-sensitivity flexible pressure sensors.
To utilize thermally expandable microspheres for simplified microstructure formation and enhanced sensor performance.

Main Methods:

Screen printing of flexible sensors incorporating thermally expandable microspheres.
Post-printing thermal treatment to form microstructures and utilize microspheres as ionic liquid reservoirs.
Characterization of sensor performance, including sensitivity, detection range, and cycling stability.

Main Results:

Achieved ultrahigh sensitivity (Smax = 49999.5 kPa⁻¹) and a wide detection range (0-350 kPa).
Demonstrated excellent long-term cycling stability with minimal degradation after 30,000 cycles.
Successfully applied the sensors for human radial artery pulse wave detection, highlighting potential in health monitoring.

Conclusions:

Thermally expandable microspheres offer an effective and scalable approach for fabricating high-performance flexible pressure sensors.
The developed sensors show significant promise for practical applications, particularly in non-invasive health monitoring.
This strategy simplifies microstructure fabrication, enabling large-scale production of advanced flexible sensors.