Abstract
In this paper, gas sensing characteristics of sulfur-doped graphene oxide (S-GO) are firstly presented. The results of the sensing test revealed that, at room temperature (20 °C), S-GO has the optimal sensitivity to NH3. The S-GO gas sensor has a relatively short response and recovery time for the NH3 detection. Further, the sensing limit of ammonia at room temperature is 0.5 ppm. Theoretical models of graphene and S-doped graphene are established, and electrical properties of the graphene and S-doped graphene are calculated. The enhanced sensing performance was ascribed to the electrical properties’ improvement after the graphene was S-doped.
Highlights
IntroductionChemosensors 2021, Ammonia, as a harmful gas, damages the environment and endangers human health, but is one of the contributors to PM2.5
According to the report of the European Union, the quality of ammonia emitted to the environment is about 20 to 30 million tons every year
All chemicals were purchased from Shandong Xiya reagent, and were of analytical grade and could be used without further purification
Summary
Chemosensors 2021, Ammonia, as a harmful gas, damages the environment and endangers human health, but is one of the contributors to PM2.5. The increase in ammonia content in the environment is mainly due to direct or indirect human activities. With the further development of the chemical industry and agriculture, people’s awareness of environmental protection has been increasing, the demand for monitoring ammonia concentration is increasing [1,2,3]. Ammonia will do harm to human health. Research shows that the concentration of ammonia must be lower than 20 ppm in the environment wherein humans work, so that it will not affect human health. It is necessary to detect low concentrations of ammonia [4,5,6]. The common ammonia detection methods are optical [7], calorimetric [8], gasphase chromatography, and acoustic methods
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