At present, environmental air quality has become a topic of great concern in people's daily life. We need a gas sensor with high sensitivity, low cost and easy maintenance to protect people's living environment and improve their quality of life. As an excellent semiconductor material, tungsten oxide has been considered as one of the new type of tungsten oxide materials for the detection of nitrogen dioxide, hydrogen sulfide and ammonia gas.
Nitrogen dioxide gas sensor
As a harmful gas, nitrogen dioxide has great damage to human respiratory system and is the main source of acid rain, so the monitoring and detection of nitrogen dioxide gas is very important for environmental protection and health protection. As a semiconductor functional material developed in recent years, tungsten oxide has been playing an increasingly extensive role in the field of gas sensors and other fields. It has good gas sensitivity to nitrogen dioxide gas and can be used to make nitrogen dioxide gas sensors.
Hydrogen sulfide gas sensor
Hydrogen sulfide gas exists as an air pollutant in industrial production and daily life, the high concentration of which not only affects industrial production, but also seriously threatens the production of human and other products. After contacting hydrogen sulfide, tungsten oxide can cause the number of negative charge carriers to increase, which leads to the decrease of resistance of tungsten oxide semiconductor, and the doping of precious metal Au in it can reduce the response time of gas sensitive elements and improve the sensitivity to hydrogen sulfide.
Ammonia gas sensor
Ammonia is a colorless, pungent odor that has a corrosive and irritating effect on the skin tissues it touches. The solubility of ammonia is very high, and it can stimulate and corrode the upper respiratory tract of animals or human body, and weaken the human body's resistance to disease. The sensitivity of Au doped tungsten oxide sensitive film to ammonia gas in air is very strong and the corresponding time is relatively short. It is the best choice to use it as the material for ammonia gas sensor.
Gas sensor is one of the measures to solve air pollution, and tungsten oxide semiconductor will also be widely used in all aspects in the future.
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