Performance Study of Flexible Temperature Sensor Based on Carbon Sensitive Material

Abstract

In this study, a flexible film temperature sensor was fabricated by screen printing technology. The temperature sensor was fabricated by firstly printing nano-silver conductive ink and sequentially carbon temperature sensitive ink onto a flexible polyethylene terephthalate (PET) substrate. By changing the proportion of nano-carbon black in the temperature sensitive ink and the sintering temperature of the nano-silver conductive ink, the effects on the conductivity and temperature sensitivity of the flexible film sensor were investigated, and the linearity, hysteresis and stability of the prepared sensor were verified. When the sintering temperature of silver electrode based on PET film was 130 °C, the electrode square resistance was 10.2 mΩ/□. When the ambient temperature varies between 25 and 75 °C, the resistance of the temperature sensor decreases as the amount of nano-carbon black added increases. Besides, the flexible temperature sensor shows high linearity and good stability. By virtue of the flexibility, simple preparation process and low cost, this flexible temperature sensor that can be found useful in a certain range of applications, including wearable devices, biomedical devices, smart packaging and smart house.