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Article

Highly Sensitive Gas Sensing Material for Environmentally Toxic Gases Based on Janus NbSeTe Monolayer

by 1 and 1,2,*
1
Condensed Matter Theory Group, Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
2
Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology (KTH), S-100 44 Stockholm, Sweden
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(12), 2554; https://doi.org/10.3390/nano10122554
Received: 2 November 2020 / Accepted: 12 December 2020 / Published: 19 December 2020
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, CO2, NO, NO2, H2S, and SO2 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 μs for NO and NO2 and ps for CO, CO2, H2S, and SO2 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 IV 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. View Full-Text
Keywords: electronic properties and charge transfer; first-principles calculations; gas sensors; IV characteristics; Janus NbSeTe monolayer; sensitivity electronic properties and charge transfer; first-principles calculations; gas sensors; IV characteristics; Janus NbSeTe monolayer; sensitivity
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MDPI and ACS Style

Singh, D.; Ahuja, R. Highly Sensitive Gas Sensing Material for Environmentally Toxic Gases Based on Janus NbSeTe Monolayer. Nanomaterials 2020, 10, 2554. https://doi.org/10.3390/nano10122554

AMA Style

Singh D, Ahuja R. Highly Sensitive Gas Sensing Material for Environmentally Toxic Gases Based on Janus NbSeTe Monolayer. Nanomaterials. 2020; 10(12):2554. https://doi.org/10.3390/nano10122554

Chicago/Turabian Style

Singh, Deobrat, and Rajeev Ahuja. 2020. "Highly Sensitive Gas Sensing Material for Environmentally Toxic Gases Based on Janus NbSeTe Monolayer" Nanomaterials 10, no. 12: 2554. https://doi.org/10.3390/nano10122554

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