Research On Preparation And Properties Of Ethanol Measurement Sensor

Volatile organic compounds are generally toxic or their vapors are flammable when mixed with air,posing a major threat to personal safety.Therefore,it is necessary to develop gas-sensitive materials with fast response,high response and low operating temperature to make sensors for their detection.In this paper,the required ZnO and silver oxide were prepared by precipitation method,and three gas-sensitive materials were prepared by doping with carbon nanotubes,namely:ZnO,Ag2O/ZnO and carbon nanotubes doped with Ag2O/ZnO.the materials were characterized by crystalline shape,overall morphology,high-resolution characterization and specific surface area.The gas-sensitive properties of the materials were tested using a gas-sensitive tester.The main research and conclusions of this paper are as follows:ZnO gas-sensitive material was prepared using the precipitation method.The response of the sensor to ethanol reached the maximum(2.977)when the heating voltage was 4.8v,at which the temperature of the sensor was about 210℃ and the heating power consumption was about 0.265 W.The response of the sensor to methanol under the same conditions was 1.590,which showed a certain selectivity.Ag2O and ZnO were prepared separately using the precipitation method,and they were doped in a molar ratio of 1/100.The performance of the sensor made for ethanol gas sensing was greatly improved,and the sensor response to ethanol was improved to 4.016 when the heating voltage was 4.4v,at which time the temperature of the sensor was about 170℃,the power consumption of the sensor was about 0.220 W,and the response time and recovery time were 11 s.but the sensor response to methanol was 4.171,indicating that the sensor could not selectively identify ethanol and methanol.The doping of carbon nanotubes in the previously prepared Ag2O/ZnO material at a ratio of 1/100 by mass,the morphological characterization of the material revealed a significant agglomeration of the material and a significant decrease in the specific surface area of the material to 17.7634 m2/g,which resulted in a significant decrease in the gassensitive performance of the material,as reflected in the highest response of the sensor compared to the Ag2O/ZnO material,when the The heating voltage is increased to 4.6 v,the sensor temperature is 190℃,the power consumption is 0.242 W.and the sensor response is reduced to 1.986.This indicates that if we want to take advantage of the large specific surface area of carbon nanotubes to improve the gas-sensitive performance,we need to pay special attention to the microscopic morphology of the material to avoid the agglomeration phenomenon.