Ultra‐wide‐range and high‐precision temperature monitoring based on NiO/Polyimide hybrid nanomaterials

The need for temperature perception appears in all aspects of our lives. With the development of science and technology, higher requirements are put forward for the combination of high-accuracy and wide detection range of the sensor. In this study, a facile strategy method was developed to prepare the NiO slurry and realize the wide-range and high-precision thermistor based on NiO. Via dispersing the NiO nanoparticles into polyimide (PI) to afford the NiO slurry, the thermistor is obtained by spin coating, thermal curing, and electrode preparation, which can operate in the very wide range from 220 K to 470 K, as well as exhibited the outstanding thermal sensitivity (B) with value exceeded 5400 K. Moreover, the sensor shows very high detection accuracy, can detect the tiny temperature difference up to 0.05 K. Notably, through brushing the mixture onto the PI substrate or peel off from the substrate, a flexible, or free-stand sensor was obtained, which displayed great mechanical properties and stabilities. This allows the sensor to be used on various curved surfaces and other objects with complex shapes, which greatly enriches the use scenarios and scope of the temperature sensor.