Gas Sensing Properties of CdO-MgO Nanocomposites: A Comprehensive Study

This study investigates the structural and gas sensing properties of CdO-MgO nanocomposites, offering a comprehensive analysis of their morphology, crystalline structure, and sensing performance. The nanocomposites were synthesized using a cost-effective sol-gel method, followed by detailed structural characterization. XRD analysis confirmed the successful incorporation of MgO into the CdO lattice, leading to enhanced structural stability and reduced crystallite size. FESEM images revealed uniform dispersion of nanoparticles with controlled morphology, while FTIR spectra validated the presence of functional groups essential for gas sensing applications. Gas sensing performance was evaluated against various target gases, including ammonia (NH3), hydrogen sulfide (H2S), and nitrogen dioxide (NO2), under different operating temperatures. The results demonstrated that the CdO-MgO nanocomposites exhibit high sensitivity, fast response-recovery times, and excellent selectivity towards NH3 at an optimized temperature. The improved sensing behavior is attributed to the synergistic effect between CdO and MgO, which enhances charge carrier mobility and increases surface oxygen vacancies. This study highlights the potential of CdO-MgO nanocomposites as promising materials for high-performance gas sensors in environmental and industrial applications. Further research on tuning the composition and doping strategies may lead to the development of highly efficient and selective gas sensors for real-world applications.