A High Sensitive Flexible Pressure Sensor Designed by Silver Nanowires Embedded in Polyimide (AgNW-PI)

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Silver nanowires (AgNW) are crucial for flexible electronics due to their conductivity and flexibility.
• Challenges exist in AgNW adhesion and surface conductivity for reliable sensor performance.

Purpose of the Study:

• To develop a novel AgNW-PI composite material for flexible electrodes.
• To fabricate a high-sensitivity flexible pressure sensor with enhanced performance.
• To investigate the sensor's response to varying pressure levels.

Main Methods:

• In situ synthesis of AgNW within a polyimide (PI) matrix to improve adhesion.
• Selective wet etching technique to enhance the surface conductivity of AgNW-PI films.
• Fabrication of a flexible pressure sensor using two face-to-face AgNW-PI ultrathin layers.

Main Results:

• The AgNW-PI films exhibited enhanced surface conductivity after selective wet etching.
• The flexible pressure sensor achieved high sensitivity (1.3294 kPa⁻¹) at low pressures (~600 Pa).
• The sensor demonstrated excellent repeatability, durability, and saturation at higher pressures.

Conclusions:

• The in situ synthesis and wet etching method effectively addresses AgNW detachment and enhances conductivity.
• The developed AgNW-PI flexible pressure sensor offers a low-cost, high-performance solution for detecting mechanical forces.
• This technology holds significant potential for applications in flexible electronics and wearable devices.