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Ultrasensitive, Fast-Response, and Stretchable Temperature Microsensor Based on a Stable Encapsulated Organohydrogel
Hao Wang1,2, Dijie Yao1, Yibing Luo1
1State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China.
ACS Sensors
|November 14, 2024
Summary
New stretchable temperature sensors offer high sensitivity and fast response for accurate health monitoring and robot perception. This organohydrogel-based device overcomes limitations of traditional hydrogel sensors, enabling reliable long-term use.
Area of Science:
- Materials Science
- Biomedical Engineering
- Robotics
Background:
- Ionic conductive hydrogel sensors show promise for wearable applications due to stretchability and biocompatibility.
- Existing hydrogel sensors suffer from low sensitivity, slow response times, and poor environmental stability, limiting their practical use.
- Accurate long-term health monitoring and robot perception require advanced temperature sensing with improved performance.
Purpose of the Study:
- To develop highly sensitive and stable stretchable temperature sensors for advanced applications.
- To address the limitations of conventional hydrogel-based temperature sensors.
- To propose a novel double-side elastomer-encapsulated thin-film organohydrogel (DETO) architecture.
Main Methods:
- Fabrication of stretchable temperature sensors using a double-side elastomer-encapsulated thin-film organohydrogel (DETO) architecture.
- Optimization of sensor performance by adjusting the water-polyol binary solvent composition and film thicknesses.
- Characterization of sensor performance, including sensitivity, response/recovery time, detection range, stretchability, and environmental stability.
Main Results:
- The DETO microsensors achieved a thickness of 380 μm with unprecedented temperature sensitivity (37.96%/°C) and fast response (6.01 s) and recovery (10.53 s) times.
- The sensors demonstrated a wide detection range (25-95.7 °C) and good stretchability (40% strain), outperforming conventional hydrogel sensors.
- The developed sensors exhibited excellent environmental stability with negligible dehydration and prolonged operational duration.
Conclusions:
- The DETO architecture significantly enhances temperature sensing performance, overcoming limitations of traditional hydrogel sensors.
- These advanced sensors are suitable for real-time monitoring of physiological signals (skin temperature, respiration) and robotic temperature perception.
- The findings pave the way for reliable and accurate long-term monitoring and perception in diverse environments.
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