NANOCOMPOSITE-BASED THIN FILM CARBON MONOXIDE SENSORS

Abstract

Over the past decade, organic semiconductors have been of great interest in basic research and practical applications. Composites based on organic materials have become widespread due to their unique properties and partial biodegradability: they are also suitable as sensitive materials — sensors for detecting various gases. One such gas is carbon monoxide or a different carbon monoxide. Carbon monoxide occurs wherever conditions exist for incomplete combustion of carbon-containing substances. One of the industrial industries where carbon monoxide is emitted in large volumes is the oil and gas industry. The main source in this industry are flares for combustion of associated gases, during the operation of gas turbine plants, as well as exhaust gases from internal combustion engines of construction, drilling equipment, vehicles, etc. Due to the high toxicity of carbon monoxide, it is necessary to create highly sensitive materials for CO sensors. So, when inhaling small concentrations of carbon monoxide (up to 1000 mg/m3), a person feels heaviness in the head, dizziness, nausea, a feeling of pleasant exhaustion, due to which a person cannot soon leave the affected area, and with prolonged (2–3 months) contact with CO, chronic carbon monoxide poisoning is possible at a concentration of 10-50 mg/m3. Therefore, the search for a new material having high sensitivity and selectivity to carbon monoxide is relevant. The purpose of this study is to develop a highly sensitive electronic gas sensor for detecting carbon monoxide at room temperature. The films were made by irrigation from a polymer solution containing graphene oxide and carbon nanotubes. The morphology of the surface of thin polymer films was investigated, spectral chemical analysis was carried out, voltampere characteristics of sensors were measureed0 and an IoT (Internet of Things) solution for remote monitoring was developed. The results show a good response and repeatability of the results at room temperature, allowing the thin films of the graphene polymer-CNT oxide composite to be considered a promising electronic sensor material for CO detection.