The sensors were prepared by drop-casting a MoS 2 -containing solution onto a SiO 2 substrate and functionalizing the surface of the MoS 2 with Pd using evaporation. of various graphene-based gas/vapor sensors, such as NH3, NO2, H2, CO, SO2, H2S. A facile, scalable and low-cost strategy for fabricating hydrogen sensors with few-layered Pd-functionalized MoS 2 according to a simple solution process is reported.
Herein, we have reviewed the working principles, recent developments, and future perspectives of p-n heterojunctions of 2D materials for gas sensing applications. The VA-MoS2 gas sensor showed two times higher response to NO2 as compared to horizontally aligned MoS2 at room temperature. Graphene-Based Chemical Vapor Sensors for Electronic Nose Applications. By choosing 2D materials with different band structures, charge polarity, carrier concentration, and work function, band alignment at the interface can be precisely engineered to achieve the selective gas sensing performance with low operating temperature. But the performance of the sensors suffers greatly due to their selectivity and high working temperature leading to poor stability and short-term uses the van der Waals 2D p-n heterojunction-based gas sensors hold several advantages since both the materials and the depletion layer formed at the junction can actively tune the sensing performance. Traditional gas sensors use homogeneous materials as the sensing interface in which the surface adsorbed oxygen ion species play an important role in its performance. Heterostructures of 2D materials exhibit absolutely novel physics and versatility with accelerated device performance by integrating the atomic scale properties of individual materials. 2D materials and their heterojunctions have been explored for gas sensing applications due to their tremendous surface-to-volume ratio, active edges with atomic thickness, and tunable electrical properties. Prajapati (Shekhar) Indian Institute of Science.
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