Hydrogen sulfide gas sensing through new heterostructured nanocomposite

It is greatly significant to achieve a highly selective hydrogen sulfide gas sensor at low temperatures. To improve the gas sensing performance of magnesium ferrite, a nanocomposite of MgFe₂O₄/MoO₃ was prepared through co-precipitation, hydrothermal, and solid-state mixing methods. Crystalline structure, morphology, and elemental composition were analyzed by XRD, FESEM, and XPS. The gas sensing analysis revealed that the n-n heterostructure nanocomposite of MgFO/MoO₃ exhibits a 2.10 times greater response than pristine MgFe₂O₄ towards H₂S at 135 °C. The nanocomposite MgFO/MoO₃ exhibited a response of 51.36% for 7.2 ppm of H₂S at 135 °C. The significant improvement in sensing behavior is attributed to the synergistic effect of n-n nanocomposite.