Abstract
The development of resistive NH3 gas sensor detection technology has important practical significance for environmental protection and human health monitoring. We prepared a novel gas-sensitive nanocomposite of ZnO/SnO2 heterojunction modified by Au nanoparticles by simple synthesis methods including hydrothermal reduction, solvothermal, and wet impregnation. Then, we analyzed the crystallinity, morphology, and elemental composition of the prepared materials by different characterization means, which proved the successful preparation of Au-ZnO/SnO2 materials. We tested the response performance of the prepared sensor to NH3, and the Au-ZnO/SnO2-2 (Zn/Sn = 0.3wt%) sensor has the best performance. Its response value to 100 ppm NH3 can be up to 11 at the optimal temperature 240 °C, which is about 8 times better performance than the unmodified SnO2 sensor. In addition, it has fast response and recovery performance (1 min/13 min), good repeatability, long-term stability and selectivity. Finally, we analyzed the high sensing properties of Au-ZnO/SnO2-2 materials, which can be attributed to the construction of heterojunction promoting electron transfer and the successful modification of Au nanoparticles increasing the adsorption site.
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Acknowledgements
The authors sincerely acknowledge financially support by the National Natural Science Foundation of China (21872102 and 22172080).
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This work was supported by the National Natural Science Foundation of China (21872102 and 22172080).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by QL, RZ, HZ, and YS. The first draft of the manuscript was written by QL and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Liu, Q., Zhao, R., Zhan, H. et al. Au nanoparticle-modified ZnO/SnO2 heterojunction nanocomposites for highly sensitive detection of NH3. J Mater Sci: Mater Electron 35, 626 (2024). https://doi.org/10.1007/s10854-024-12398-7
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DOI: https://doi.org/10.1007/s10854-024-12398-7