CrSe_2 and CrTe_2 Monolayers as Efficient Air Pollutants Nanosensors

TL;DR

This study employs DFT calculations to evaluate CrSe_2 and CrTe_2 monolayers, especially defective and doped variants, as promising nanosensors for detecting hazardous gases with high sensitivity and selectivity.

Contribution

It introduces the use of CrSe_2 and CrTe_2 monolayers, including defect and doping modifications, as efficient gas sensors, providing detailed electronic and charge transfer analyses.

Findings

CrTe_2 with Te vacancies shows strong gas binding energies.

Doped CrTe_2 exhibits enhanced electronic responses for sensing.

CrTe_2 outperforms CrSe_2 in sensitivity and charge transfer effects.

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.