Self-Adhesive, Highly Linear Flexible Strain Sensor Designed Using the Thermal Response Countermeasure Principle for...

Area of Science:

• Materials Science
• Polymer Science
• Sensor Technology

Background:

• Flexible strain sensors are crucial for intelligent devices and human-computer interaction.
• Temperature variations cause signal drift, compromising sensor accuracy and stability.
• Existing strain sensors struggle with reliable performance in fluctuating thermal environments.

Purpose of the Study:

• To develop a flexible strain-sensing material insensitive to temperature variations.
• To mitigate the thermal expansion mismatch and improve sensor stability.
• To enhance the performance of strain sensors for applications in variable temperature conditions.

Main Methods:

• Exploited the negative temperature coefficient of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS).
• Constructed a network cross-linking structure, introduced hydrogen bonding, and modulated metal coordination.
• Balanced antagonistic negative temperature effect (NTC) and thermal expansion effect (PTC) to achieve temperature insensitivity.

Main Results:

• Reduced the temperature coefficient of resistance (TCR) from 40.29 to 0.45%/K.
• Achieved a broad strain range (0-50%) with excellent linearity and stable signal output.
• Demonstrated exceptional stability and durability over 2000 stretching-recovery cycles.

Conclusions:

• Successfully developed a temperature-insensitive flexible strain-sensing material.
• The sensor exhibits stable strain monitoring capabilities in variable temperature environments.
• Significant potential for applications in human motion and health monitoring.