CrSe_2 and CrTe_2 Monolayers as Efficient Air Pollutants Nanosensors

Hakkim Vovusha; Puspamitra Panigrahi; Yash Pal; Muhammad J. A. Shiddiky; Massimiliano Di Ventra; Hoonkyung Lee; Tanveer Hussain

arXiv · 2512.13843

CrSe_2 and CrTe_2 Monolayers as Efficient Air Pollutants Nanosensors

Hakkim Vovusha·Puspamitra Panigrahi·Yash Pal·Muhammad J. A. Shiddiky·Massimiliano Di Ventra·Hoonkyung Lee·Tanveer Hussain

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Abstract

Nanosensors are critical in environmental monitoring, industrial safety, and public health by detecting specific hazardous gases like CO, NO, SO_2, and CH_4 at trace levels. This study uses density functional theory (DFT) calculations to examine the gas-sensing capabilities of chromium diselenide (CrSe_2) and chromium ditelluride (CrTe_2) monolayers through their structural and electronic responses to gas adsorption. Adsorption energy analysis shows that Te vacancy-induced CrTe_2 (VTe-CrTe_2) exhibits the strongest binding with energies of -1.52, -1.79, and -1.61 eV for CO, NO, and SO_2, respectively. Similarly, CrSe_2 has its values of -1.13, -1.17, -0.90, and -1.12 eV for CO, NO, SO_2, and CH_2, respectively, indicating suitability for reversible sensing. This study also investigates how substitutional doping of Ge, Sb, and Sn influences the sensing mechanism of CrSe_2 and CrTe_2 monolayers. Density of states (DOS) analysis highlights notable electronic changes around the Fermi level, especially in VTe-CrTe_2 and Sb/Sn-doped CrTe_2, confirming their enhanced sensing abilities. Charge density difference analysis shows significant charge redistribution, with CrTe_2 experiencing stronger charge transfer effects than CrSe_2. Variations in electrostatic potential and work function further demonstrate the higher sensitivity of CrTe_2, particularly in its defective and doped forms, confirming its status as a superior material for gas sensing applications.

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Hakkim Vovusha, Puspamitra Panigrahi, Yash Pal, Muhammad J. A. Shiddiky, Massimiliano Di Ventra, Hoonkyung Lee, Tanveer Hussain. 2025-12-15. CrSe_2 and CrTe_2 Monolayers as Efficient Air Pollutants Nanosensors. https://arxiv.org/abs/2512.13843

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