MXene-Based Gas Sensors for NH₃ Detection: Recent Developments and Applications

Area of Science:

• Materials Science
• Environmental Science
• Sensor Technology

Background:

• Ammonia (NH3) is a toxic gas prevalent in industrial and agricultural sectors, and as a disease biomarker.
• Accurate ammonia detection is critical for environmental safety, public health, and various industrial applications.
• MXene materials, with their unique properties, show promise for sensitive ammonia gas sensing.

Purpose of the Study:

• To review recent advancements in MXene and its composite-based sensors for low-temperature ammonia gas detection.
• To elucidate design strategies for enhancing MXene sensor performance.
• To discuss the potential and challenges of MXene sensors in real-world applications.

Main Methods:

• Review of literature on MXene-based ammonia gas sensors.
• Analysis of composite design strategies: heterojunction engineering, surface functionalization, and active site modification.
• Evaluation of sensing performance metrics: selectivity, response time, detection limits, and operating temperature.

Main Results:

• MXene composites demonstrate significantly improved ammonia sensing performance at low temperatures.
• Strategies like heterojunctions and functionalization enhance selectivity, speed, and sensitivity.
• Successful applications shown in industrial safety, food monitoring, medical diagnosis, and agriculture.

Conclusions:

• MXene-based sensors are highly effective for low-temperature ammonia detection.
• Optimized material design is key to overcoming challenges like oxidation and humidity interference.
• Future development aims for real-time, energy-efficient monitoring networks.