Vishwakarma Ankit Kumar, Sharma Ajaya Kumar, Yadava Lallan
Thin Film Laboratory, Department of Physics, Deen Dayal Upadhyaya Gorakhpur University Gorakhpur U. P. India
RSC Adv. 2024 May 21;14(23):16459-16465. doi: 10.1039/d4ra01888e. eCollection 2024 May 15.
Gas monitoring devices are in demand for a rapidly growing range of applications. Metal oxide-based gas sensors have been extensively used for the detection of toxic pollutant gases, combustible gases, and hydrocarbon vapors. The sensitivity for a low concentration and observed response and the recovery times of the reported gas sensors are not satisfactory, and it needs further detailed studies. In the present work, undoped SnO and cadmium sulfide (CdS)-doped SnO thick films were fabricated using the screen-printing method to study their sensing behavior towards tested organic vapors such as acetone, propanol, and ethanol. The sensing properties of fabricated sensors were investigated for the test gases, acetone, propanol, and ethanol, at an elevated temperature of 473 K. It was observed that the 2 wt% CdS-doped SnO sensor showed a maximum response (78%) and was highly selective (44.6%) to propanol over acetone and ethanol. The results showed that the diminution of the SnO crystallite size with the CdS content leads to an improvement in the response of the SnO sensor for the tested gases. The microstructural properties are also correlated to the sensing behavior. The measurement showed that the CdS-SnO thick film sensor is highly sensitive. At the same time, it is more selective to propanol than the other test gases, ethanol and acetone.
气体监测设备在越来越多的应用领域中都有需求。基于金属氧化物的气体传感器已被广泛用于检测有毒污染气体、可燃气体和碳氢化合物蒸汽。已报道的气体传感器对低浓度的灵敏度、观察到的响应以及恢复时间都不尽人意，需要进一步深入研究。在本工作中，采用丝网印刷法制备了未掺杂的SnO和硫化镉（CdS）掺杂的SnO厚膜，以研究它们对丙酮、丙醇和乙醇等受试有机蒸汽的传感行为。在473 K的高温下，对制备的传感器针对丙酮、丙醇和乙醇等测试气体的传感特性进行了研究。结果发现，2 wt% CdS掺杂的SnO传感器显示出最大响应（78%），并且相对于丙酮和乙醇，对丙醇具有高选择性（44.6%）。结果表明，SnO微晶尺寸随CdS含量的减小导致SnO传感器对受试气体的响应有所改善。微观结构特性也与传感行为相关。测量表明，CdS-SnO厚膜传感器具有高灵敏度。同时，它对丙醇的选择性高于其他测试气体乙醇和丙酮。
