Synthesis and Gas-Sensing Performances of Mn₃O₄-Decorated Cr₂O₃ Nanoparticle for H₂S Detection

Mn₃O₄ decorated with Cr₂O₃ was prepared via a cost-effective and straightforward photolysis method and utilized as an H₂S gas sensor. The nanocomposite exhibited excellent chemical sensing properties toward H₂S gas at 200°C, achieving a sensitivity of 89.93. A proposed sensing mechanism highlights the synergistic roles of Mn₃O₄ and Cr₂O₃ in gas detection. This study underscores the potential of Mn₃O₄-Cr₂O₃ composites in industrial and environmental monitoring applications, offering a reliable and efficient solution for detecting hazardous gases.