Langmuir, Год журнала: 2025, Номер unknown

Опубликована: Май 29, 2025

Recently, because of the urgent need for safety and health protection, there has been a growing focus on exploring effective feasible gas sensors based metal oxide semiconductors (MOSs) detecting trace levels hydrogen sulfide (H2S). In this context, cobalt (Co) doping strategy was proposed to improve H2S-sensitive properties In2O3 nanomaterials, enabling them monitor 1 ppm H2S at relatively lower temperature. The Co-doped hierarchical porous nanocubes (Co-In2O3 HPNCs) were prepared through hydrothermal route using In(OH)3 as precursor. When utilized sensing material detect H2S, Co-In2O3 HPNCs demonstrated significant enhancements compared pure In2O3. These include reduction in operating temperature (260 vs 300 °C), increase response (36.99 12.28 20 H2S), better selectivity (13.21 3.07 times ethanol). Even sensor can give value 1.86, highlighting its substantial potential limit detection (LOD) ppm. A detailed analysis multiple sensitization effects Co reveals that these improved characteristics be primarily traced back three factors, namely, an increased oxygen vacancy concentration, narrowing bandgap, upward shift Fermi level.

Язык: Английский