Ethanol sensor based on nano crystalline Nd3+ substituted in Mg-Cd ferrite thick film,Sensors and Actuators B: Chemical

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Ethanol sensor based on nano crystalline Nd3+ substituted in Mg-Cd ferrite thick film
Sensors and Actuators B: Chemical ( IF 8.0 ) Pub Date : 2024-12-14 , DOI: 10.1016/j.snb.2024.137128
Rakesh M. Shedam, Amar M. Patil, Mahadev R. Shedam, Seong Chan Jun, Ashok B. Gadkari

The structure and properties of polycrystalline Mg_1-xCd_x Nd_yFe_2-yO₄ (x = 0.0, 0.1, 0.3, 0.5, 0.7) (y = 0.02) are investigated through co-precipitation of oxalate from high-purity sulfate solutions. The samples are sintered at 500°C for five hours. The ferrite phase and cubic spinel structure are confirmed by TG-DTA, XRD, EDS, and Raman spectroscopy. As the Cd²⁺ content increases, the lattice constant exhibits a nonlinear change, reflecting intricate interactions within the crystal structure. Crystallite size, calculated using the Scherrer formula, ranges from 28.69 to 32.05 nm. As the Cd²⁺ content increases, the surface morphology shows a corresponding increase in grain size. The IR spectrum reveals two significant absorption bands corresponding to the tetrahedral and octahedral sites. Raman shifts dependent on rare earth doping affect the optical and magnetic properties. X-ray photoelectron spectroscopy reveals the elemental composition, oxidation, and transition states of the synthesized Mg_0.5Cd_0.5Nd_0.02Fe_1.98O₄ nanoparticles. A study is conducted to determine the gas sensing properties of Mg_1-xCd_x Nd_yFe_2-yO₄, (x = 0.3, 0.5, 0.7) (y = 0.02) thick films in detecting liquid petroleum gas (LPG), ethanol (C₂H₅OH), and chlorine (Cl₂). The Mg-Cd-Nd ferrite ethanol sensor, Mg_0.5Cd_0.5Nd_0.02Fe_1.98O₄, responds to 100 ppm ethanol gas at 350°C, a response that is significantly higher than reported in other studies. Mg_0.5Cd_0.5Nd_0.02Fe_1.98O₄ is highly selective for ethanol detection compared to other gases and demonstrates satisfactory repeatability and stability.

更新日期：2024-12-18

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