Improving Gas Sensors for Detecting Oxygenated VOCs Using Bi2O3 and SnO2
Author Information
Author(s): Yang Haoyue, Suematsu Koichi, Mashiba Felipe Hiroshi, Watanabe Ken, Shimanoe Kengo, Calderon-Moreno Jose Maria
Primary Institution: Kyushu University
Hypothesis
Can Bi2O3 improve the sensitivity of SnO2-based gas sensors for detecting oxygenated volatile organic compounds (VOCs)?
Conclusion
The study found that Bi2O3-loaded SnO2 sensors showed significantly higher sensitivity and faster response times for detecting various oxygenated VOCs compared to neat SnO2.
Supporting Evidence
- Bi2O3 particles were uniformly dispersed on SnO2, leading to improved sensor performance.
- The 1Bi-L-SnO2 sensor showed excellent sensitivity to various oxygenated VOCs at 200 °C and 250 °C.
- Surface functionalization with Bi2O3 increased the amount of active oxygen ions on the sensor surface.
- Partial combustion of ethanol was dominant on the 1Bi-L-SnO2 surface at lower temperatures.
Takeaway
Scientists mixed Bi2O3 with SnO2 to make a better sensor that can quickly and accurately detect harmful gases in the air.
Methodology
Bi2O3 was uniformly dispersed on SnO2 nanoparticles using an impregnation method, followed by calcination, and the gas sensors were tested for their sensitivity to various VOCs at different temperatures.
Limitations
The study did not explore the long-term stability of the sensors or the effects of humidity on their performance.
Digital Object Identifier (DOI)
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