Research On Sensitive Characteristics Of Hydrogen Sulfide Based On Metal Semiconductor Oxide Nanomaterials

With the rapid development of industrial production,it has brought many conveniences to people,and it has also continuously discharged industrial waste gas into the atmosphere.Such as carbon monoxide,nitrogen dioxide,and hydrogen sulfide.As an important chemical and chemical raw material,hydrogen sulfide is essential for the production,storage and transportation of hydrogen sulfide in the petrochemical industry.Therefore,it is necessary to develop an efficient and stable hydrogen sulfide sensor for timely and reliable response under severe conditions.Nano-metal-semiconductor oxides have been receiving a lot of attention from researchers because of their many characteristics,and they are excellent materials for making gas sensors.However,there are few studies on one-dimensional nanostructured metal oxide gas sensing materials.This paper mainly studies the synthesis of tungsten oxide nanowires by hydrothermal method and detects the gas sensing properties of hydrogen sulfide.In this dissertation,WO₃ nanowires were synthesized by hydrothermal method.The diameter of the synthesized nanowires was 10 nm and the length was 1-2μm.The experiment proves that the optimal operating temperature of the gas sensor is300 degrees Celsius.For 20 ppm H₂S,the sensitivity of the gas sensor is 10 at this temperature.The response time and recovery time of the gas sensor are 5 s and 15 s.The gas sensor can detect Hydrogen sulfide as low as 1 ppm.Sensor have excellent stability,selectivity,long service time and strong anti-interference ability to other concentrations of gas.The performance ofα-Fe₂O₃ synthesized by hydrothermal method was analyzed.Its working temperature was 350°C.α-Fe₂O₃ gas sensor has reliable response and great stability to 1ppm H₂S.