Three-dimensional openwork structure YMn1-xFexO3 Spherical Nanomaterials for H2S Gas Sensors with Superior Sensitivity

Semiconductor metal oxides (SMOs) are widely used in gas sensing and detection due to their low cost, ease of manufacture, and portability. However, single SMO for hydrogen sulfide (H 2 S) detection suffers from high operating temperatures, low sensitivity, and poor selectivity. This study focused on designing multifaceted SMO materials, and three-dimensional openwork structure YMn 1-x Fe x O 3 composites were prepared using the premixed stagnation flame method. The prepared gas sensor showed high sensitivity to H 2 S gas. Specifically, the YMn 0.7 Fe 0.3 O 3 sensor has a maximum response value of 10.55 at an optimum operating temperature of 200 °C when exposed to 30 ppm H 2 S. It also demonstrated a low detection limit of 0.94 ppm and excellent selectivity, which is advantageous for long-term practical applications. The excellent sensing performance is attributed to the three-dimensional openwork structure of the material and the successful doping of Fe 3+ into the YMnO 3 lattice. These features increase the specific surface area, which facilitates the diffusion and adsorption of H 2 S gas in the sensing layer. The YMn 1-x Fe x O 3 materials provide a viable strategy for designing highly responsive and selective SMO gas sensors for detecting H 2 S.