A Palladium-Deposited Molybdenum Disulfide-Based Hydrogen Sensor at Room Temperature.

Recently, hydrogen (H₂) energy has attracted attention among eco-friendly energy sources because H₂ energy is eco-friendly, energy-efficient, and abundant in nature. However, when the concentration of H₂ in the atmosphere is more than 4%, H₂ has a risk of explosion. H₂ is a colorless, tasteless, and odorless gas that is difficult to detect with human senses. Therefore, developing an optimized hydrogen sensor is essential. Palladium (Pd) has good reactivity to hydrogen. Molybdenum disulfide (MoS₂) has high carrier mobility, sensitive reactivity to toxic gases, and high surface-area-to-volume ratio. Therefore, we proposed hydrogen sensors that use Pd and MoS₂. The main fabrication processes include MoS₂ deposition through CVD and Pd deposition through DC sputtering. In this study, we utilized Pd and MoS₂ to enable sensing at room temperature. By optimizing the Pd to a nanoparticle structure with an expansive surface area of 4 nm, we achieved a fast response time of 4–5 s and an enhanced yield through a simplified structure. Hydrogen sensors inherently exhibit sensitivity to various environmental factors. To address these challenges, technologies such as machine learning can be incorporated. Emphasizing low-power consumption and various application compatibilities becomes pivotal to promoting commercialization across diverse industries. [ABSTRACT FROM AUTHOR]