Highly selective ethanol gas sensor based on CdS/Ti₃C₂T MXene composites

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Hazardous gas sensing is crucial for industrial and environmental safety.
• Ethanol, a dangerous gas from combustion, poses risks to health and the environment.
• Gas sensor design prioritizes stability and high sensing sensitivity.

Purpose of the Study:

• To develop a superior ethanol sensor with enhanced response and recovery times.
• To utilize a novel synthesis method for creating a robust gas-sensing material.
• To evaluate the sensor's performance under various conditions.

Main Methods:

• Synthesized a novel heterostructure by "wrapping" cadmium sulfide (CdS) nanoparticles onto metallic Ti3C2 MXene.
• Created a "rice crust"-like structure with uniformly covered CdS nanoparticles on the Ti3C2 MXene surface.
• Tested the sensor's response to ethanol gas at room temperature across a concentration range (5-100 ppm) and relative humidity (60% and 90% RH).

Main Results:

• Achieved a high response signal of up to 31% for 20 ppm ethanol.
• Demonstrated a fast recovery time of 41 seconds.
• Confirmed good detection of ethanol gas at room temperature with consistent performance across tested concentrations and humidity levels.

Conclusions:

• The developed CdS/Ti3C2 MXene sensor exhibits excellent performance for ethanol detection.
• The "rice crust"-like heterostructure design enhances sensing capabilities.
• This approach offers a new strategy for developing advanced hazardous gas sensors.