<p>This study involved the preparation and characterization of Li_xZn_1-xFe₂O₄ nanoferrite materials (with x varying from 0.00 to 0.12) by the sol–gel method to assess their efficacy as sensors for the environmentally detrimental nitrogen dioxide (NO₂). X-ray diffraction (XRD) studies indicated that all samples preserved the cubic crystal structure of ZnFe₂O₄, accompanied by a progressive reduction in the crystal lattice constant with increasing lithium content. Images from the field emission scanning electron microscope (FESEM) demonstrated the creation of uniform nanoparticles measuring between 25 and 70 nm, indicating a distinct influence of lithium concentration on particle size distribution. Experimental testing indicated that the incorporation of lithium ions markedly enhanced gas sensitivity performance. The sample with a concentration of x = 0.06 attained the greatest sensitivity of 209.25% at an operating temperature of 225°C, with a response time of 10.27 s and a recovery time of no more than 6.07 s. The findings indicated a consistent enhancement in performance with rising NO₂ gas concentration up to 120 ppm, validating the appropriateness of these materials for practical use. The enhancements are ascribed to the dual impact of lithium: it enhances electrical characteristics by promoting charge transfer among iron ions, while simultaneously augmenting the density of crystalline flaws that serve as active sites for gas molecule adsorption. The findings position Li_xZn_1-xFe₂O₄ materials as leading candidates for gas sensing applications in environmental and industrial sectors, particularly due to their low cost, straightforward fabrication, and superior performance.</p>