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Selectivity in Chemiresistive Gas Sensors: Strategies and Challenges
Peresi Majura Bulemo1, Dong-Ha Kim2,3, Hamin Shin3,4,5
1Department of Mechanical and Industrial Engineering, University of Dar es Salaam, P.O. Box 35131, Dar es Salaam, Tanzania.
Highly functional chemical gas sensors are crucial for health and safety. This review explores strategies like material design and defect engineering to improve gas sensor selectivity and speed, overcoming commercialization barriers.
Area of Science:
- Materials Science
- Chemical Engineering
- Sensor Technology
Background:
- Growing demand for chemical gas sensors in healthcare, safety, and food industries.
- Chemiresistive gas sensors show promise but suffer from poor selectivity and slow response/recovery.
- Mechanisms for selective gas detection in chemiresistive materials are not fully understood.
Purpose of the Study:
- To review state-of-the-art strategies for achieving gas-selective chemiresistive materials.
- To elucidate the mechanisms behind material-gas interactions for improved sensor performance.
- To guide the design and selection of materials for accurate specific gas detection.
Main Methods:
- Materials design and engineering.
- Surface modification and functionalization with catalysts.
- Defect engineering and material structure control.
- Integration with physical/chemical gas filtration media.
Main Results:
- Strategies discussed enhance selectivity and performance of chemiresistive gas sensors.
- Understanding material-gas interactions is key to optimizing sensor design.
- Improved selectivity and faster response/recovery are achievable through advanced material strategies.
Conclusions:
- Advanced strategies offer pathways to overcome limitations in current gas sensor technology.
- Further research into material-gas interactions can unlock new opportunities for sensor optimization.
- Recommendations provided for future research to enhance gas sensor selectivity and commercial viability.
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