Abstract
Owing to harsh working environments and complex industrial requirements, traditional gas sensors are prone to deformation damage, possess a limited detection range, require a high working temperature, and display low reliability, thereby necessitating the development of flexible and low-temperature gas sensors. In this study, we developed a low-temperature polyimide (PI)-based flexible gas sensor comprising a reduced graphene oxide (rGO)/MoS2 composite. The micro-electro-mechanical system technology was used to fabricate Au electrodes on a flexible PI sheet to form a “sandwiched” sensor structure. The rGO/MoS2 composites were synthesized via a one-step hydrothermal method. The gas-sensing response was the highest for the composite comprising 10% rGO. The structure of this material was characterized, and a PI-based flexible gas sensor comprising rGO/MoS2 was fabricated. The optimal working temperature of the sensor was 141 °C, and its response-recovery time was significantly short upon exposure to 50–1500 ppm NH3. Thus, this sensor exhibited high selectivity and a wide NH3 detection range. Furthermore, it possessed the advantages of low power consumption, a short response-recovery time, a low working temperature, flexibility, and variability. Our findings provide a new framework for the development of pollutant sensors that can be utilized in an industrial environment.
Highlights
Ammonia is the second most produced chemical in the world and the most common industrial pollutant because of illegal ammonia discharge owing to leakage during chemical processing
Conclusions reduced graphene oxide (rGO)/MoS2 composites were synthesized via a one-step hydrothermal method
The result showed that the NH3 detection performance of the rGO/MoS2 composites was the highest when the content of rGO was 10%
Summary
Ammonia is the second most produced chemical in the world and the most common industrial pollutant because of illegal ammonia discharge owing to leakage during chemical processing. As a green and clean source of energy, ammonia has been developed for various applications, including use as rocket fuel [1] as well as in fuel cells [2], hydrogenstorage materials [3], and new energy vehicles [4] This widespread use has resulted in an increase in ammonia leakage during industrial production processes. The most commonly used gas sensors are semiconductor gas sensors made of metal oxide or polymer materials; they are widely used for detecting the leakage of toxic and harmful gases [6,7] Because of their slow desorption characteristics, such sensors require a high working temperature. Some sensors exhibit baseline drift and need to be recalibrated frequently [8]
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