In this paper, the morphological and sensing properties of the Sn-doped ZnO-Zn₂SnO₄ nanorods obtained by the hydrothermal method are presented. The developed methodology exhibits high levels of efficiency and cost-effectiveness, making it particularly suitable for implementation in the field of nanoelectronics and biomedical applications. Scanning electron microscopy was used to analyze the morphology of the Sn-doped ZnO-Zn₂SnO₄ nanostructures showing nanorod arrays formation. Energy dispersive X-ray spectroscopy was involved to determine the chemical composition and shows uniform distribution of Sn. Structural analysis by X-ray diffraction shows high crystallinity of Sn-doped ZnO-Zn₂SnO₄ samples with (0002) main orientation and formation of a ternary phase Zn₂SnO₄. These nanostructures obtained by the hydrothermal method were tested as sensor materials for ethanol and carbon dioxide. A high response of about 130% to 100 ppm ethanol vapor with a very fast response time of 1s at an operating temperature of 250 ℃ was observed. This factor is very important for the detection of harmful or explosive gases. Sn-doping in ZnO and the formation of Zn₂SnO₄ is considered to be the key factor that changes the morphological and sensing properties for application use in miniaturized photodetectors, light emitting diodes, laser light source, and gas sensors.