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Strain Sensor with Both a Wide Sensing Range and High Sensitivity Based on Braided Graphene Belts
Yuxiang Li1,2, Tengyu He1, Liangjing Shi1
1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Ding Xi Road, Shanghai 200050, P. R. China.
ACS Applied Materials & Interfaces
|March 25, 2020
Summary
This study introduces a novel flexible strain sensor using braided graphene belts (BGBs) that achieves both a wide sensing range and high sensitivity. This breakthrough offers potential for advanced wearable instruments monitoring human motion.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Flexible strain sensors are crucial for various applications, but integrating wide sensing range and high sensitivity remains a challenge.
- Existing sensors often compromise between broad strain coverage and precise detection.
Purpose of the Study:
- To develop a flexible strain sensor with an integrated wide sensing range and high sensitivity.
- To investigate the performance and underlying mechanisms of braided graphene belt (BGB) based strain sensors.
Main Methods:
- Fabrication of a flexible strain sensor using braided graphene belts (BGBs) embedded in dragon skin elastomer.
- Characterization of the sensor's performance, including sensing range, sensitivity (gauge factor), monitoring limit, hysteresis, and repeatability.
- Scanning Electron Microscopy (SEM) analysis to understand the structural basis of the sensor's performance.
Main Results:
- The BGB strain sensor achieved a wide sensing range (up to 55.55%) and high sensitivity (gauge factor > 175.16 across the entire working range).
- Demonstrated a minute monitoring limit (0.01%), low hysteresis, minimal overshoot, and excellent cycling repeatability (>6000 cycles).
- SEM revealed that the skew angle and intersection regions of graphene belts are key to the sensor's performance.
Conclusions:
- The developed BGB strain sensor successfully integrates a broad sensing range with high sensitivity, overcoming previous limitations.
- The sensor's ability to detect full-range human motions highlights its potential for wearable instruments and human motion monitoring.
