Α-FE2O3/RGO/PANI TERNARY NANOCOMPOSITES-BASED HUMIDITY TOLERANT ROOM TEMPERATURE FLEXIBLE NO2 GAS SENSOR

Abstract

For the particular application of the room temperature gas sensor, the relative humidity (%RH) causes critical issues. Here we synthesized a high-sensitive and flexible α Fe2O3/rGO/PANI-based NO2 gas sensor with good sensing properties at room temperature and humidity resistance at a low operating voltage (0.4 V). A flexible tempered glass (FTG) substrate was used to fabricate the gas sensing film. Further, by using a vacuum coating unit, the silver interdigitated electrodes (IDE) were coated on an FTG substrate. The optimal composite showed a very high response with a low detection limit (0.2ppm). The sensor showed a negligible response for other toxic gases, such as C3H6O, C2H5OH, CO, NH3, and Cl2, at 100ppm. The enhanced sensing performance could be credited to the development of a unique ternary structure between α-Fe2O3/Polyaniline and reduced graphene oxide sheets. Such invention of α-Fe2O3/rGO/PANI ternary nanocomposite sensor implies that it is a compelling hybrid material for making low operating voltage, humidity tolerant, flexible, and highly selective room temperature NO2 gas sensor.