Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Hunan Provincial Key Laboratory of Cytochemistry, School of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China.
School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China.
Anal Methods. 2022 Jul 29;14(29):2866-2875. doi: 10.1039/d2ay00847e.
In this study, zinc oxide@cupric oxide hollow nanospheres (ZnO@CuO HNS, 330 nm in diameter) were successfully prepared by a hard-template method using amino-phenolformaldehyde resin spheres (APF) as the templates. A new type of thin-film gas sensor toward hydrogen sulfide (HS) was fabricated by means of drop-coating on the gold electrode of an alumina ceramic tube. The microstructure and morphology of the nanosphere composites were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the gas-sensing performance of the composites toward the detection of HS were investigated. The ZnO@CuO nanocomposite with a hollow structure exhibited good gas-sensing properties. Under the optimum operating temperature of 260 °C, ambient temperature of 30 °C, and ambient humidity of 70%, the linear response of the sensor to HS was in the concentration range of 0.1-100 ppm, and its detection limit reached 0.0611 ppm, with a quick response time of 78 s. Also, the sensor possessed good repeatability, selectivity, and stability. The long-term stability and run duration of such sensors were pronounced, with only a 1.9% reduction in the signal after the continuous monitoring of HS gas in a pig farm for 18 months using Alibaba's cloud remote transmission system, which presents an important practical application prospect in atmosphere environment monitoring on livestock-raising fields.
在这项研究中，通过使用氨基-苯酚-甲醛树脂球（APF）作为模板的硬模板法成功制备了氧化锌@氧化铜空心纳米球（ZnO@CuO HNS，直径为 330nm）。通过在氧化铝陶瓷管的金电极上滴涂的方式，制备了一种用于硫化氢（HS）检测的新型薄膜气体传感器。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）对纳米球复合材料的微观结构和形态进行了表征，并研究了复合材料对 HS 检测的气体传感性能。具有空心结构的 ZnO@CuO 纳米复合材料表现出良好的气体传感性能。在最佳工作温度为 260°C、环境温度为 30°C、环境湿度为 70%的条件下，传感器对 HS 的线性响应在 0.1-100ppm 的浓度范围内，检测限达到 0.0611ppm，响应时间快至 78s。此外，该传感器还具有良好的重复性、选择性和稳定性。这种传感器的长期稳定性和运行时间表现出色，在使用阿里巴巴的云远程传输系统连续监测养猪场中的 HS 气体 18 个月后，信号仅下降了 1.9%，这在畜牧业领域的大气环境监测方面具有重要的实际应用前景。
