ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Modified MnSiO₄ and MnAl₂O₅: synthesis, characterization, and application as high-performance gas sensors

S. L. Sangle, S. V. Thakare, R. B. More, S. S. Kushare, G. B. Dabhade, and A. V. Borhade

Department of Chemistry, KSKW ASC College CIDCO, Nashik, India

E-mail: shilpasangle620@gmail.com

Received: 26 February 2025  Accepted: 13 August 2025

Abstract:

Gas detection is critical in controlling industrial and vehicular emissions, household safety, and environmental health. This paper reports for the first time on the synthesis, characterization, and gas-sensing application of modified manganese-based oxides: MnSiO₄, MnSiO₄:Al₂O₅, MnAl₂O₅, and MnAl₂O₅:SiO₂ fabricated as thick-film sensors. The synthesized oxides were thoroughly analyzed using XRD, FT-IR, SEM–EDX, and TEM to assess their crystallinity, phase purity, and nanostructured morphology. Their gas sensitivity against hazardous substances like CO, CO₂, Cl₂, NH₃, H₂, and H₂S was evaluated under controlled conditions. Annealing at temperatures between 300 and 500 °C significantly enhances crystallinity and gas sensitivity by optimizing surface defects and active sites. Sensitivity, responsivity, and selectivity for NH₃ and H₂S in the best manner are shown for materials MnSiO₄:Al₂O₃ and MnAl₂O₅:SiO_2, as they get enhanced reactivity with a greater degree of the tailor-made electronic structure. This work allows doped manganese silicates and aluminates to be used as a low-cost, high-performance gas sensor for real-time air-pollutant monitoring. It sheds light on dopant effects and thermal treatments for tuning sensor efficiency.

Graphical abstract

Keywords: Mechanochemical synthesis; Manganese silicates; Metal oxide composites; Gas-sensing materials; Hydrothermal processing

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-025-04318-8

Chemical Papers 79 (11) 8205–8218 (2025)