Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 68, Issue 8, Pages 4064-4069Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2021.3084543
Keywords
Temperature measurement; Thermistors; Temperature sensors; Resistance; Temperature distribution; Electrodes; Electrical resistance measurement; Nematic liquid crystal (NLC); negative temperature coefficient (NTC); recovery; sensitivity; thermistor; temperature measurement medium
Funding
- National Natural Science Foundation of China (NSFC) [11374087, 11504080]
- Natural Science Foundation of Hebei Province of China [A2019202235, A2017202004]
- Key Subject Construction Project of Hebei Province University
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The experimental results show that the resistance value of the thermistor decreases exponentially with increasing temperature in the range of 25 degrees C-120 degrees C. Under the voltage of 1 V, the total resistance percentage changes by 93.1%, making it suitable for use as a temperature sensor.
The thermistor was fabricated by filling the nematic liquid crystal (NLC) material IM95100-000 into a liquid crystal device with an interdigital electrode structure. In the temperature range of 25 degrees C-120 degrees C, the temperature response of the thermistor under different voltages was measured with a step length of 5 degrees C to study its performance. The experimental results show that the resistance value of the thermistor decreases exponentially with increasing temperature in the range of 25 degrees C-120 degrees C. The temperature resistance characteristics at different voltages can satisfy the Steinhart-Hart formula well and the nonlinear fitting coefficient can reach 0.999; under the voltage of 1 V, the total resistance percentage changes by 93.1%, the material constant B25-120 value can reach 3299.07 K, and the temperature coefficient of resistance (TCR) can reach 0.98%/K. As a temperature sensor, it is twice as sensitive as that without the interpolated electrode structure, and the sensitivity can be further improved as the temperature decreases. Through the stability and recovery measurements, it is found that the resistance has no obvious deviation, which verifies the possibility of long-term application of this thermistor.
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