Highly sensitive ethanol sensor based on zinc oxide-based nanomaterials with low power consumption

Gas detection has a wide range of application needs in all walks of life, and a variety of gas sensors used in sensor nodes often use battery power supply and long maintenance cycle, which has a higher demand for low power consumption and high sensitivity. Among many sensors, semiconductor gas sensor, especially nano metal oxide semiconductor gas sensor, has become the most widely used gas sensor because of its high sensitivity, fast response, and mass production. It is necessary to study how to reduce the power consumption and improve the gas sensitivity of the sensor by using composite ZnO-based nanomaterials. In this paper, the preparation, characterization, gas sensing properties, and gas sensing mechanism of ZnO-based nanomaterials were studied. ZnO-ZnS nanofiber heterostructures were prepared on pure ZnO substrates by orthogonal experiment and hydrothermal method, and the low-temperature gases of ZnO-ZnS and pure ZnO were analyzed. The gas sensing characteristics, material characteristics, gas sensing test and analysis, and gas sensing mechanism of ZnO-ZnS were compared. The ZnO-ZnS gas sensor was tested in the temperature range of 180-340 degrees C. When the temperature increases, the response value of the sensor first rises to the peak value and then gradually decreases. The maximum value appears at 260 degrees C, and the maximum sensitivity is 55.34. The results show that the ZnO-based heterostructure attached by ZnS nanospheres reduces the working temperature of ethanol, thus reduces the power consumption of the sensor, and has good sensitivity.