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Extraction and Detection of Geosmin and 2-Methylisoborneol in Water and Fish using High-Capacity Sorptive Extraction Probes and GC-MS

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Highly Selective Ethyl Mercaptan Sensing Using a MoSe₂/SnO₂ Composite at Room Temperature.

Sukhwinder Singh¹, Jyotirmoy Deb², Jatinder Vir Singh³

¹Department of Physics, Guru Nanak Dev University, Amritsar, Punjab 143005, India.

ACS Applied Materials & Interfaces

|May 13, 2022

Summary

This study introduces a novel MoSe₂/SnO₂ composite sensor for highly sensitive and selective detection of volatile organic sulfur compounds (VOSCs), specifically ethyl mercaptan, at room temperature. The sensor demonstrates reliable performance even at high humidity levels.

Keywords:

MoSe2/SnO2 composite ethyl mercaptan (EM) sensor heterostructures relative humidity (RH)selectivity

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Area of Science:

Materials Science
Chemical Sensing
Nanotechnology

Background:

Volatile organic sulfur compounds (VOSCs) are crucial biomarkers for dental diseases like halitosis and indicators for air quality monitoring.
Achieving room-temperature selective detection of VOSCs at sub-ppm levels remains a significant challenge in sensor technology.

Purpose of the Study:

To develop a highly sensitive and selective room-temperature sensor for ethyl mercaptan detection.
To investigate the performance of a heterostructure-based MoSe₂/SnO₂ composite for VOSC sensing.
To elucidate the adsorption mechanism and selectivity using density functional theory (DFT).

Main Methods:

Synthesis of a MoSe₂/SnO₂ composite using a facile two-step method.
Fabrication and testing of a gas sensor device based on the synthesized composite.
Performance evaluation including sensitivity, selectivity, and stability across various relative humidity levels.
Density Functional Theory (DFT) calculations to understand adsorption properties and electronic modifications.

Main Results:

The MoSe₂/SnO₂ composite sensor achieved detection of ethyl mercaptan down to 1 ppm at room temperature.
The sensor exhibited excellent selectivity towards ethyl mercaptan over other common analytes like hydrogen sulfide.
Stable sensor response was observed across a wide relative humidity range (40-90%), including extreme levels.
DFT simulations confirmed strong chemisorption of ethyl mercaptan on the composite surface, explaining the observed selectivity.

Conclusions:

The MoSe₂/SnO₂ heterostructure composite is a promising material for developing highly selective and sensitive room-temperature sensors for ethyl mercaptan.
The sensor's robust performance under varying humidity conditions makes it suitable for real-world applications in environmental monitoring and diagnostics.
The combined experimental and theoretical approach provides valuable insights into the sensing mechanism for VOSCs.