Layer-Dependent Sensing Performance of WS 2 -Based Gas Sensors.

Two-dimensional (2D) materials, such as tungsten disulfide (WS 2 ), have attracted considerable attention for their potential in gas sensing applications, primarily due to their distinctive electrical properties and layer-dependent characteristics. This research explores the impact of the number of WS 2 layers on the ability to detect gases by examining the layer-dependent sensing performance of WS 2 -based gas sensors. We fabricated gas sensors based on WS 2 in both monolayer and multilayer configurations and methodically evaluated their response to various gases, including NO 2 , CO, NH 3 , and CH 4 at room temperature and 50 degrees Celsius. In contrast to the monolayer counterpart, the multilayer WS 2 sensor exhibits enhanced gas sensing performance at higher temperatures. Furthermore, a comprehensive gas monitoring system was constructed employing these WS 2 -based sensors, integrated with additional electronic components. To facilitate user access to data and receive alerts, sensor data were transmitted to a cloud-based platform for processing and storage. This investigation not only advances our understanding of 2D WS 2 -based gas sensors but also underscores the importance of layer engineering in tailoring their sensing capabilities for diverse applications. Additionally, the development of a gas monitoring system employing 2D WS 2 within this study holds significant promise for future implementation in intelligent, efficient, and cost-effective sensor technologies.