بررسي ويژگي‌هاي حسگري‌گاز هيدروژن Pd/CoMoO4

Hydrogen Gas Sensing Properties of α- an‎d β-CoMoO₄ Nanostructures Accurate an‎d real-time monitoring of hazardous gases such as hydrogen, particularly in industrial, energy, an‎d safety systems, requires the development of gas sensors with high sensitivity, appropriate selec‎tivity, an‎d reliable operational stability. Among the various sensing technologies, metal oxide semiconductor gas sensors have attracted considerable attention due to their low fabrication cost, simple manufacturing processes, miniaturization capability, an‎d favorable thermal stability. In this study, cobalt molybdate (CoMoO₄) nanostructures were investigated as active sensing materials for hydrogen gas detection. Owing to its suitable electronic structure, surface-active sites, an‎d favorable charge-transfer properties, CoMoO₄ is considered a promising can‎didate for detecting reducing gases such as hydrogen. Initially, α- an‎d β-phase CoMoO₄ nanostructures were synthesized using a hydrothermal method, with the annealing temperature carefully controlled. Their structural, morphological, an‎d phase characteristics were subsequently investigated. The results demonstrated that the crystalline phase of CoMoO₄ could be controlled by adjusting the heat-treatment conditions. The hydrogen gas-sensing properties of the synthesized CoMoO₄ nanostructures were then eva‎luated. The results revealed that the α-phase cobalt molybdate exhibited better gas-sensing performance than the β-phase. Furthermore, the incorporation of palladium significantly enhanced the hydrogen-sensing response of the fabricated sensors. The observed sensing behavior can be explained by the adsorption of oxygen species on the semiconductor surface an‎d their subsequent reaction with hydrogen gas. Based on these findings, CoMoO₄ nanostructures demonstrate considerable potential as active materials for metal oxide semiconductor-based gas sensors for hydrogen detection.

پرويز كاملي

حسين احمدوند

حميده شاكري پور , پيمان صاحب سرا