Ammonia is one of the most hazardous gases, which plays a vital role in industry. Detection of low concentrations of this gas in the air is of particular importance for conservation and environmental purposes. In this study, ZnO-MWCNT nanocomposite is prepared by the in-situ method inclusive magnetron sputtering and spray pyrolysis. Then, its structural properties are studied regarding XRD spectra, FESEM, and EDX images. These studies show that nanotubes fill the porous spaces between ZnO nanoparticles and make the surface of the film rough. Hence, the surface area of the sensor and the probability of contact between gas and sensor increase. Also, sensing experiments are carried out for different concentrations of CH₄ and CO gases at room temperature. Then, the results of this sensor for NH₃ gas are compared with ZnO sensor results, which indicates that the sensitivity of ZnO-MWCNT sensor to NH₃ is higher and more stable. However, its sensitivity to CH₄ and CO is too low to be taken into consideration. Therefore, it can be claimed that MWCNTs could improve the sensing properties of ZnO film to detect NH₃ gas with low concentrations such as 10 and 20 ppm. The response time and recovery time of ZnO-MWCNT sensor for 10 ppm of NH₃ gas are 1.022, 13.687 s, and 107.109 s. Therefore, we suggest that ZnO-MWCNT nanocomposite could be used in a new generation of NH₃ sensors.

氨是最危险的气体之一，在工业中起着至关重要的作用。对于保护和环境目的，检测空气中低浓度的这种气体特别重要。在这项研究中，ZnO-MWCNT纳米复合材料是通过原位磁控溅射和喷雾热解法制备的。然后，针对XRD光谱，FESEM和EDX图像研究其结构性质。这些研究表明，纳米管填充了ZnO纳米颗粒之间的多孔空间，并使薄膜表面粗糙。因此，传感器的表面积以及气体与传感器之间接触的可能性增加。同样，在室温下对不同浓度的CH ₄和CO气体进行了传感实验。然后，该传感器的NH _3结果将气体与ZnO传感器的结果进行比较，表明ZnO-MWCNT传感器对NH ₃的灵敏度更高且更稳定。然而，其对CH ₄和CO的敏感性太低而不能考虑。因此，可以说MWCNTs可以改善ZnO薄膜的感测性能，以检测低浓度（例如10和20 ppm）的NH ₃气体。ZnO-MWCNT传感器对10 ppm NH ₃气体的响应时间和恢复时间为1.022、13.687 s和107.109 s。因此，我们建议Z​​nO-MWCNT纳米复合材料可用于新一代NH ₃传感器。