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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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Updated: Jun 18, 2026

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3D Network Spacer-Embedded Flexible Iontronic Pressure Sensor Array with High Sensitivity over a Broad Sensing Range.

Dandan Xu1,2, Ningning Bai1,2, Weidong Wang1,2

  • 1School of Mechano-Electronic Engineering, Xidian University, Xi'an 710071, China.

ACS Applied Materials & Interfaces
|October 16, 2024
PubMed
Summary

This study introduces a flexible iontronic pressure sensor (FIPS) using a 3D network spacer and MXene electrode. It achieves high sensitivity and linearity for pressure sensing without complex manufacturing.

Keywords:
Ti3C2Tx MXenehuman−machine interactioniontronic pressure sensorsensing arraythree-dimensional network spacer

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Flexible pressure sensors often require complex microstructures for enhanced sensitivity.
  • Existing methods for improving sensor performance can be manufacturing-intensive.
  • There is a need for high-performance flexible pressure sensors produced with simpler techniques.

Purpose of the Study:

  • To develop a novel flexible iontronic pressure sensor (FIPS) with high sensitivity and linearity.
  • To avoid complex microstructure construction in the fabrication process.
  • To demonstrate the sensor's capabilities in practical applications like human motion monitoring and robotics.

Main Methods:

  • Fabrication of a FIPS by embedding a 3D network spacer (3DNS) between an ionic gel and a Ti3C2Tx MXene electrode.
  • Leveraging the deformation of the 3DNS and the electrical double layer effect for sensing.
  • Characterization of sensor performance including sensitivity, linearity, response time, limit of detection, and stability.

Main Results:

  • Achieved high sensitivity (87.4 kPa⁻¹) over a broad pressure range (400-1000 kPa) with excellent linearity (R² = 0.998).
  • Demonstrated a rapid response time (46 ms), low limit of detection (50 Pa), and stability over 10,000 cycles.
  • Successfully applied the FIPS for human motion monitoring and robotic gripping tasks, and built a 7x7 sensing array.

Conclusions:

  • The developed FIPS offers high sensing performance without complex manufacturing techniques.
  • The design philosophy is extendable for fabricating advanced flexible pressure sensors.
  • Facilitates applications in human motion monitoring, robotic tactile sensing, and human-machine interaction.