Fast Response Isopropanol Sensing Properties with Sintered BiFeO3 Nanocrystals
Abstract
:1. Introduction
2. Materials and Methods
2.1. Preparation of BiFeO3 Nanocrystals
2.2. Characterization
2.3. Fabrication and Measurement of Gas Sensors
3. Results and Discussion
3.1. Growth Analysis
3.2. Characterization
3.3. Gas Sensing Performance
4. Conclusions
- Pure BiFeO3 nanocrystals have been successfully fabricated by a simple wet chemical method. BiFeO3 nanocrystals sintered at 500 and 550 °C and the prepared gas sensors display almost the same performance.
- At the optimum working temperature of 240 °C, the fabricated sensor shows excellent isopropanol gas sensing properties with a high gas sensitivity of 31 exposed to 100 ppm isopropanol, fast response and recovery time (6 and 17 s), nice stability, and good selectivity to isopropanol.
- The sensor shows a perfect linear relationship between sensitivity and concentration in the range of 2–100 ppm at 240 °C and reaches the saturation point when the concentration is over 100 ppm. In addition, the measurement accuracy is of 1 ppm level. Therefore, the isopropanol gas sensor based on BiFeO3 nanocrystals can realize precise detection under 100 ppm concentration ranges and early warning over 100 ppm.
- The mechanism analysis reveals that the adsorbed oxygen ions may be mainly composed of O2.
- Conclusions above show that BiFeO3 nanocrystals are the superior candidate for a gas sensing application toward isopropanol detection.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Xu, H.; Xu, J.; Wei, J.; Zhang, Y. Fast Response Isopropanol Sensing Properties with Sintered BiFeO3 Nanocrystals. Materials 2020, 13, 3829. https://doi.org/10.3390/ma13173829
Xu H, Xu J, Wei J, Zhang Y. Fast Response Isopropanol Sensing Properties with Sintered BiFeO3 Nanocrystals. Materials. 2020; 13(17):3829. https://doi.org/10.3390/ma13173829
Chicago/Turabian StyleXu, Hongxiang, Junhua Xu, Junlin Wei, and Yamei Zhang. 2020. "Fast Response Isopropanol Sensing Properties with Sintered BiFeO3 Nanocrystals" Materials 13, no. 17: 3829. https://doi.org/10.3390/ma13173829