The Effect of the Premixed Stagnation Flame Method for the Synthesis of YMnO₃ based on Precursor Species on the Gas-Sensitive Performance of H₂S

Premixed stagnation flame method was used to synthesize Yttrium manganate (YMnO 3 ) nanoparticles to investigate the precursor species’ effect on the resulting products’ physical phase formation. In addition, the sensitivity of sensors constructed with the most efficient combination of precursors for detecting hydrogen sulfide (H 2 S) was evaluated. Based on thermal breakdown and infrared spectra analysis, Y(NO 3 ) 3 ·6H 2 O and (CH 3 COO) 2 Mn·4H 2 O have been shown to be the best precursors. The resulting YMnO 3 phase exhibited the highest purity, with numerous small tetrahedral particles averaging 20 nm in size attached to the surface of larger spherical particles. The assembled particles displayed a uniform size distribution ranging from 400 to 600 nm. The YMnO 3 sensors showed the most favorable response to 30 ppm H 2 S gas at 220 °C, achieving a response value of 2.94. It demonstrates excellent selectivity, repeatability, and long-term stability. The premixed stagnation flame method can be used to fabricate nanoparticles with complex composition or structure at low cost, such as hollow structure, core–shell structure or multivariate metal oxide. The porous structure of the synthesized spherical YMnO 3 nanoparticles has the advantages of small particle size and large specific surface area, showing excellent gas sensitive properties.