Enhancement of CO gas sensing performance by Mn-doped porous ZnSnO3 microspheres

Tiwari, Manish Kumar and Yadav, Subhash Chand and Srivastava, Abhishek and Kanwade, Archana and Satrughna, Jena Akash Kumar and Mali, Sawanta S. and Patil, Jyoti V. and Hong, Chang Kook and Shirage, Parasharam M. (2022) Enhancement of CO gas sensing performance by Mn-doped porous ZnSnO3 microspheres. RSC Advances, 12 (50). pp. 32249-32261. ISSN 2046-2069 (https://doi.org/10.1039/D2RA06785D)

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Abstract

This work reports the synthesis of Mn-doped ZnSnO3 microspheres (Zn1−xMnxSnO3) using a simple co-precipitation method with (x = 0 to 0.15) and characterized for structural, morphological, surface area, and sensing properties. X-ray diffraction (XRD) analysis revealed the face-centered cubic structure of Mn-doped ZnSnO3 samples. Brunauer–Emmett–Teller (BET) analysis demonstrated the variation in surface area from 15.229 m2 g−1 to 42.999 m2 g−1 with x = 0 to 0.15 in Zn1−xMnxSnO3. XPS indicates the change in the defect levels by Mn doping, which plays a crucial role in chemical sensors. Indeed a significant increase (≈311.37%) in CO gas sensing response was observed in the x = 0.10 sample compared to pure ZnSnO3 with a simultaneous reduction in operating temperature from 250 to 200 °C. Moreover, remarkable enhancements in response/recovery times (≈6.6/34.1 s) were obtained in the x = 0.10 sample. The Mn-doped ZnSnO3 could be a promising candidate for CO gas sensing devices used for maintaining air quality.

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