| Summary: | Recently, a new family of the Janus NbSeTe monolayer has exciting development prospects for two-dimensional (2D) asymmetric layered materials that demonstrate outstanding properties for high-performance nanoelectronics and optoelectronics applications. Motivated by the fascinating properties of the Janus monolayer, we have studied the gas sensing properties of the Janus NbSeTe monolayer for CO, CO<inline-formula><math display="inline"><semantics><msub><mrow/><mn>2</mn></msub></semantics></math></inline-formula>, NO, NO<inline-formula><math display="inline"><semantics><msub><mrow/><mn>2</mn></msub></semantics></math></inline-formula>, H<inline-formula><math display="inline"><semantics><msub><mrow/><mn>2</mn></msub></semantics></math></inline-formula>S, and SO<inline-formula><math display="inline"><semantics><msub><mrow/><mn>2</mn></msub></semantics></math></inline-formula> gas molecules using first-principles calculations that will have eminent application in the field of personal security, protection of the environment, and various other industries. We have calculated the adsorption energies and sensing height from the Janus NbSeTe monolayer surface to the gas molecules to detect the binding strength for these considered toxic gases. In addition, considerable charge transfer between Janus monolayer and gas molecules were calculated to confirm the detection of toxic gases. Due to the presence of asymmetric structures of the Janus NbSeTe monolayer, the projected density of states, charge transfer, binding strength, and transport properties displayed distinct behavior when these toxic gases absorbed at Se- and Te-sites of the Janus monolayer. Based on the ultra-low recovery time in the order of <inline-formula><math display="inline"><semantics><mrow><mi>μ</mi><mi>s</mi></mrow></semantics></math></inline-formula> for NO and NO<inline-formula><math display="inline"><semantics><msub><mrow/><mn>2</mn></msub></semantics></math></inline-formula> and <inline-formula><math display="inline"><semantics><mrow><mi>p</mi><mi>s</mi></mrow></semantics></math></inline-formula> for CO, CO<inline-formula><math display="inline"><semantics><msub><mrow/><mn>2</mn></msub></semantics></math></inline-formula>, H<inline-formula><math display="inline"><semantics><msub><mrow/><mn>2</mn></msub></semantics></math></inline-formula>S, and SO<inline-formula><math display="inline"><semantics><msub><mrow/><mn>2</mn></msub></semantics></math></inline-formula> gas molecules in the visible region at room temperature suggest that the Janus monolayer as a better candidate for reusable sensors for gas sensing materials. From the transport properties, it can be observed that there is a significant variation of <inline-formula><math display="inline"><semantics><mrow><mi>I</mi><mo>−</mo><mi>V</mi></mrow></semantics></math></inline-formula> characteristics and sensitivity of the Janus NbSeTe monolayer before and after adsorbing gas molecules demonstrates the feasibility of NbSeTe material that makes it an ideal material for a high-sensitivity gas sensor.
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