Ultrawide linear range, high sensitivity, and large-area pressure sensor arrays enabled by pneumatic spraying...

Area of Science:

• Materials Science
• Sensor Technology
• Nanotechnology

Background:

• Large-area pressure sensor arrays are crucial for mapping inhomogeneous interface pressure in practical applications.
• Existing sensors often face limitations in linear response range and sensitivity.

Purpose of the Study:

• To demonstrate a novel pneumatic spraying method for fabricating high-performance, large-area pressure sensor arrays.
• To design a unique surface morphology for enhanced sensor performance.

Main Methods:

• A pneumatic spraying method was employed to prepare large-area microstructure films (PSMF).
• The "broccoli"-like morphology was achieved by controlling spraying parameters, featuring a swollen top and shrunken bottom.
• This morphology inspired a new mechanism to increase the linear response range by decreasing series resistance with increasing pressure.

Main Results:

• The sensor achieved an ultrawide linear response range of 10,000 kPa with high sensitivity (98.71 kPa⁻¹).
• A low detection limit of 5 Pa and a small static response error of 4.4% were recorded.
• The sensor demonstrated excellent durability with 5000 cycles of full-range dynamic response.

Conclusions:

• The developed pneumatic sprayed microstructure films (PSMF) enable high-performance pressure sensor arrays.
• The unique "broccoli" morphology and associated mechanism significantly enhance the linear response range and sensitivity.
• The sensor arrays show great potential for applications in healthcare, motion detection, and the tire industry.