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Ti3C2 MXene-Based Composites for Hydrogen and Ammonia Gas Sensing: A Review
1Department of Physics and Semiconductor Science, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si 461-701, Gyeonggi-do, Republic of Korea.
Two-dimensional titanium carbide (Ti3C2) MXenes exhibit excellent gas-sensing properties for hydrogen (H2) and ammonia (NH3). Their unique surface and electrical characteristics enable high-performance, room-temperature detection with remarkable sensitivity and stability.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Two-dimensional (2D) materials, particularly MXenes like Ti3C2, possess unique surface, electrical, and chemical properties.
- These properties are critical for developing advanced gas sensors capable of detecting toxic and flammable gases.
- Hydrogen (H2) and ammonia (NH3) are important targets for gas sensing due to their safety and industrial relevance.
Purpose of the Study:
- To systematically review the gas-sensing behavior of 2D Ti3C2 MXenes for H2 and NH3 detection.
- To explore modifications and interfaces of Ti3C2 MXene for enhanced sensing performance.
- To investigate room-temperature and flexible gas sensing mechanisms using Ti3C2 MXene.
Main Methods:
- Review of literature on pristine and modified Ti3C2 MXene materials.
- Analysis of Ti3C2 MXene interfaces with metals and metal oxides for gas sensing.
- Examination of structural (e.g., interlayer spacing) and surface chemistry (termination groups) effects on sensing.
Main Results:
- Ti3C2 MXene's high electrical conductivity, layered structure, and surface terminations (-O, -F, -OH) enable excellent H2 and NH3 sensing.
- Integration with sulfur nanosheets achieved ppt-level detection limits with rapid response/recovery.
- Modified Ti3C2 MXene interfaces demonstrated long-term stability and enhanced selectivity, particularly for NH3 via hydrogen bonding.
Conclusions:
- Intrinsic properties of Ti3C2 MXene are highly conducive to high-performance, room-temperature H2 and NH3 gas sensing.
- Material modifications, such as partial oxidation to TiO2, improve gas diffusion and sensor response.
- Ti3C2 MXene and its composites offer a promising platform for advanced, stable, and selective gas sensors.
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