High-Performance Flexible Pressure Sensor with Micropyramid Structure for Human Motion Signal Detection and...

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Flexible pressure sensors are crucial for human motion detection but suffer from electromagnetic interference (EMI).
• Developing high-performance pressure sensors with effective EMI shielding remains a significant challenge.

Purpose of the Study:

• To develop a flexible pressure sensor with a micropyramidal structure exhibiting superior EMI shielding and human motion sensing capabilities.
• To investigate the influence of Ti3C2TX MXene, carbon fiber, and multiwalled carbon nanotubes on sensor performance and mechanical properties.

Main Methods:

• Fabrication of Ti3C2TX MXene/carbon fiber/multiwalled carbon nanotube/polydimethylsiloxane (MXene/CMP) films using vacuum high-temperature hot pressing and spray deposition.
• Characterization of the micropyramidal structure, EMI shielding efficiency, mechanical properties, and sensing performance of the developed films.
• Evaluation of the sensor's ability to monitor human motion signals and its long-term stability.

Main Results:

• The MXene/CMP film achieved an EMI shielding efficiency of 49.37 dB due to dielectric loss and microstructure.
• The sensor demonstrated high sensitivity (89.76 kPa⁻¹) and fast response/recovery times (61/60 ms).
• The sensor maintained sensing stability over 2000 pressure cycles, attributed to enhanced mechanical properties and crack propagation delay.

Conclusions:

• The developed micropyramidal MXene/CMP flexible pressure sensor offers excellent EMI shielding and human motion monitoring capabilities.
• The integration of specific materials and micropyramidal structure enhances sensor performance, durability, and mechanical robustness.
• This high-performance sensor shows significant potential for applications in wearable devices and healthcare monitoring.