Considering the importance of monitoring toxic and hazardous gases in the air due to their impact on the environment and human health, it is crucial to have gas sensors capable of detecting even very low concentrations with good response time, recovery time, selectivity, sensitivity, reproducibility, and long-term stability. In this work, tin oxide nanowires (characterized by a high surface-to-volume ratio) are investigated as gas sensors. Tin oxide is chosen thanks to its sensitivity and capability of chemically interact with gases like NO2 which is one of the most critical gases; it can change its electrical properties based on the concentration of the gas.