ABSTRACT
Different 2D materials that include a wonder material graphene and transition metal dichalcogenides, graphitic carbon nitride (g-C3N4), hexagonal boron nitride (h-BN), and black phosphorus (BP) etc. have been developed with different morphologies and used for gas sensing applications. Work is still going on to improve the sensing capabilities of these materials and their selectivity toward different gases is also being improved using modifiers and filters. For sensing hydrogen, the selectivity of the sensor is also of utmost importance. The selectivity of the sensor can be increased by using the Pt group metals, especially Palladium. Since palladium is a very expensive metal, it is not feasible to use it standalone as a hydrogen gas sensor, rather we can deposit the layer of palladium nanoparticles on the 2D material using physical or chemical method to increase its selectivity for hydrogen sensing. Palladium’s unique ability to form palladium hydride on adsorption of H2 gas molecules by dissociating them into hydrogen atoms and allowing them to move to the sensing layer underneath. In his chapter, we will study the basics of 2D nanomaterials, mechanism of H2 gas sensing, and the advantages of using Pd as a modifier and different polymers as filter.
