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Related Experiment Video

Updated: Jan 13, 2026

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Highly Sensitive Capacitive Pressure Sensor Based on MWCNTs/TiO2/PDMS with a Microhemispherical Array and

Yijin Ouyang1,2, Jianyong Lei2,3, Shuge Li2,4

  • 1School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China.

Polymers
|January 10, 2026
PubMed
Summary

Researchers developed a novel flexible pressure sensor using modified carbon nanotubes and titanium dioxide. This sensor offers high sensitivity and stability for applications in robotics and wearable electronics.

Keywords:
carbon nanotubescompositesflexible sensorsmicrostructuresurface modification

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Humanoid robotics advancements necessitate sophisticated flexible sensors for precise linear range detection.
  • Existing sensors often face limitations in sensitivity, stability, and detection range.

Purpose of the Study:

  • To develop a highly sensitive and stable capacitive flexible pressure sensor for wide linear range detection.
  • To investigate the impact of surface modification and microstructures on sensor performance.

Main Methods:

  • Fabrication of a capacitive flexible pressure sensor using a multi-walled carbon nanotubes/titanium dioxide/polydimethylsiloxane (MWCNTs/TiO2/PDMS) composite.
  • Creation of a micro-hemispherical structure array on the sensor surface using a templating method.
  • Surface functionalization of MWCNTs with varying concentrations of γ-aminopropyltriethoxysilane (APTES) to enhance dispersion and interfacial bonding.

Main Results:

  • The sensor exhibits dual-stage sensitivity across a broad linear range of 0-95 kPa.
  • Achieved sensitivity values of 1.89 ± 0.49 kPa⁻¹ (0-13 kPa) and 7.08 ± 0.63 kPa⁻¹ (13-95 kPa).
  • Demonstrated a rapid response time of 200 milliseconds and stability over 2500 loading cycles.

Conclusions:

  • The developed F-MWCNTs/TiO2/PDMS sensor shows significant potential for micro-pressure detection, wearable electronics, and array sensing.
  • The synergistic effect of microstructures and surface functionalization enhances overall sensing performance.
  • The sensor's adaptability confirmed its viability for practical applications in advanced robotics and electronics.