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Optimizing Gas Sensing Performance of Molybdenum Oxide through Oxygen Vacancy Modulation: A Critical Review
Jiaying Jia1, Aiwu Wang1, Xingying Li1
1Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Advanced Material Diagnostic Technology, and College of Engineering Physics, Shenzhen Technology University, Shenzhen, 518118, China.
Oxygen vacancies significantly boost molybdenum oxide (MoO3) gas sensing performance by altering electronic structure and surface chemistry. Optimizing these defects enhances sensitivity and selectivity for various target gases.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Molybdenum oxide (MoO3) exhibits excellent gas sensing properties due to its unique electronic and thermal characteristics.
- Oxygen vacancies are crucial defects that critically influence MoO3's sensing capabilities.
Purpose of the Study:
- To review the formation mechanisms and impact of oxygen vacancies on MoO3 gas sensing.
- To explore strategies for optimizing oxygen vacancy concentration for improved sensor performance.
Main Methods:
- Literature review of experimental and theoretical studies on MoO3 gas sensors.
- Analysis of the role of oxygen vacancies in gas adsorption and surface reactions.
Main Results:
- Oxygen vacancies introduce energy levels, modify surface configurations, and promote gas adsorption, enhancing MoO3 sensing.
- Optimized oxygen vacancy concentration improves sensitivity and selectivity for NH3, NO2, H2S, TEA, and ethanol.
Conclusions:
- Oxygen vacancies are key to advancing MoO3-based gas sensors.
- Further research on vacancy formation and sensor performance under varied conditions is recommended.
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