3D Coral-Like Ti₃C₂T_x MXene Heterostructures for Ultrasensitive Gas Sensing in Wildfire Monitoring

Area of Science:

• Materials Science
• Nanotechnology
• Environmental Science

Background:

• Wildfires pose significant threats, necessitating advanced early warning systems.
• Two-dimensional (2D) Ti3C2Tx MXene heterostructures show promise for gas sensing.
• Challenges exist in suppressing MXene oxidation and controlling stacking in heterojunctions.

Purpose of the Study:

• To develop a novel Ti3C2Tx/cellulose nanocrystal (CNC)/MoS2 (TCM) nanohybrid for enhanced gas sensing.
• To create a 3D hierarchical architecture that preserves MXene's intrinsic properties.
• To construct a multi-parameter sensor array for early wildfire detection.

Main Methods:

• An edge-enriched co-assembly and co-planar nanoconfined exfoliation strategy was employed.
• A Ti3C2Tx/CNC/MoS2 (TCM) nanohybrid with a 3D hierarchical architecture was synthesized.
• A vector sensor array integrating ammonia, temperature, and directional sensing was constructed.

Main Results:

• The TCM nanohybrid exhibited high conductivity (29.5 Ω) and ultralow noise (0.4%).
• Outstanding sensitivity (35.1% response to 10 ppm NH3) and rapid response/recovery (6.7 s/2.2 s) were achieved.
• The sensor array successfully demonstrated multi-parameter environmental monitoring for early wildfire detection.

Conclusions:

• The developed 3D nanohybrid effectively suppresses MXene oxidation and stacking, preserving metallic properties.
• This work advances MXene/MoS2 heterojunctions for extreme environmental monitoring applications.
• The multi-parameter sensor array shows significant potential for early wildfire detection systems.