Remarkable improvement in phosgene detection with a defect-engineered phosphorene sensor: first-principles
Mehdi Ghambarian1, Zahra Azizi2, Mohammad Ghashghaee3
1Gas Conversion Department, Faculty of Petrochemicals, Iran Polymer and Petrochemical Institute, P.O. Box 14975-112, Tehran, Iran.
Physical Chemistry Chemical Physics : PCCP
|April 25, 2020
Summary
Defective phosphorene nanosensors show high sensitivity and rapid recovery for phosgene (COCl2) detection. This defect engineering significantly enhances gas response and selectivity, enabling reusable 2D sensors for toxic gas monitoring.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Phosgene (COCl2) is a highly toxic industrial gas requiring sensitive and reliable detection methods.
- Two-dimensional (2D) materials like phosphorene offer potential for advanced nanosensor applications.
- Defect engineering in 2D materials can significantly tune their electronic and sensing properties.
Purpose of the Study:
- To investigate the sensing performance of pristine (BP) and defective (DP) phosphorene nanosensors for phosgene detection.
- To evaluate the impact of defect engineering on gas sensitivity, recovery time, and selectivity.
- To explore the potential of defect-engineered phosphorene for developing reusable toxic gas sensors.
Main Methods:
- Density Functional Theory (DFT) calculations using the HSE06/TZVP level of theory.
- Simulation of phosgene adsorption on pristine and defective phosphorene monolayers.
- Analysis of structural stability, adsorption energies, gas sensitivity, work function changes, and recovery times.
Main Results:
- Phosgene molecules adsorbed parallel to the phosphorene surface in stable planar configurations.
- Defective phosphorene (DP) exhibited significantly enhanced phosgene sensing performance compared to pristine phosphorene (BP).
- Vacancy doping in DP increased gas response by a factor of 54, achieving 726% gas sensitivity with a rapid 0.31 ns recovery time at room temperature.
- High selectivity for phosgene detection was predicted for DP in both dry and humid air conditions.
Conclusions:
- Defect engineering, specifically vacancy doping, dramatically improves the sensitivity and reusability of phosphorene-based nanosensors for phosgene.
- The work function of defective phosphorene serves as an effective indicator for COCl2 detection.
- These findings highlight the promise of rationally designed, defect-engineered 2D materials for next-generation toxic gas sensors.
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