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Wide-range soft anisotropic thermistor with a direct wireless radio frequency interface
Mahmoud Wagih1, Junjie Shi2,3, Menglong Li2
1University of Glasgow, James Watt School of Engineering, Glasgow, UK. Mahmoud.Wagih@glasgow.ac.uk.
Nature Communications
|January 10, 2024
Summary
This study introduces a flexible, stretchable thermistor for wide-range temperature sensing. Radio frequency readout overcomes traditional limits, enabling wireless applications.
Area of Science:
- Materials Science
- Sensor Technology
- Radio Frequency Engineering
Background:
- Thermistors are crucial sensors but limited by traditional DC resistive readings.
- Existing flexible temperature sensors have restricted sensing ranges.
- Positive Temperature Coefficient (PTC) thermistors face challenges in wide-range applications.
Purpose of the Study:
- To develop a large-area, flexible, and stretchable thermistor with an extended temperature sensing range.
- To overcome the limitations of traditional thermistor readout methods.
- To integrate thermistor technology into wireless sensing applications.
Main Methods:
- Fabrication of a flexible and stretchable thermistor using a short carbon fibre-reinforced Polydimethylsiloxane composite.
- Utilizing a radio frequency (RF) sensing interface for thermistor readout.
- Developing thermistor-based microwave resonators and wireless sensing systems (patch antenna, RFID tag).
Main Results:
- The composite thermistor demonstrated high resistance sensitivity (>1000 °C⁻¹) and stability under bending and stretching.
- RF readout enabled a wide temperature sensing range (30–205 °C) and high sensitivity (3.2 MHz/°C).
- Successful wireless sensing demonstration using a microstrip patch antenna and a battery-less RF identification tag.
Conclusions:
- The developed RF-based sensor readout technique overcomes traditional sensing range limitations.
- The flexible thermistor composite is suitable for integration into RF components and wireless sensing.
- This approach enables functional materials to be directly incorporated into advanced wireless sensing systems.
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