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Laser-generated BiVO4 colloidal particles with tailoring size and native oxygen defect for highly efficient gas
Xiaokang Qiao1, Youxun Xu2, Kai Yang1
1Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab. for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, 620 West Chang'an Street, Xi'an, Shaanxi, 710119, China.
Pulsed laser irradiation creates unique black bismuth vanadate (BiVO4) colloids with oxygen vacancies. This method significantly enhances H2S gas sensing performance, achieving high sensitivity and selectivity at low temperatures.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Bismuth vanadate (BiVO4) exhibits potential for gas sensing but suffers from poor performance.
- Improving the sensing capabilities of BiVO4 is crucial for practical applications.
Purpose of the Study:
- To develop a novel method for fabricating enhanced BiVO4-based gas sensors.
- To investigate the impact of pulsed laser irradiation on BiVO4's sensing properties for H2S detection.
Main Methods:
- Synthesis of size-tailored, uniform black BiVO4 colloids using pulsed laser irradiation of colloidal nanoparticles (PLICN).
- Comparative investigation of sensing properties of irradiated vs. raw BiVO4.
- Density Functional Theory (DFT) calculations to understand the role of oxygen vacancies.
Main Results:
- BiVO4 nanospheres (50 nm) produced via PLICN demonstrated superior H2S sensing.
- Achieved high sensitivity, selectivity, low detection limit (44 ppb) at 75°C.
- Sensing response was over 4 times higher than the raw material, attributed to induced oxygen vacancies.
Conclusions:
- Pulsed laser irradiation is an effective strategy to enhance BiVO4 gas sensing performance.
- Oxygen vacancies significantly improve H2S adsorption and charge transfer on the BiVO4 surface.
- The developed method offers a promising route for advanced gas sensor fabrication.
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