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Double-layer capsule of mesoporous ZnO@SnO2 for sensitive detection of triethylamine

Ming Yin,Li Zhang,Tianyi Qiu,Yan Chen,Shuyan Qi,Xiuxia Wei,Xinxin Tian,Kangjie Ge,Jingxuan Qiu,Dongpo Xu

To overcome obstacles such as low response and poor selectivity of pure ZnO and SnO2 gas sensors, the ZnO@SnO2 sensor was synthesized by hydrothermal synthesis. The samples were characterized by XRD, XPS, SEM, HRTEM, N2 adsorption–desorption and other techniques. The results show that ZnO@SnO2 forms an n–n-type heterostructure and presents a double-layer capsule with a size of 0.5–4 μm. The results show that compared with pure ZnO and SnO2, the ZnO@SnO2 sensor exhibits a higher response (138.9) to 50 ppm triethylamine (TEA) at 152°C, which is 19.56 times that of the pure ZnO sensor and 21.7 times that of the SnO2 sensor. It has a short response/recovery time (11/11 s), excellent selectivity and cycling stability. Compared with other volatile organic compounds or gases, it has higher selectivity for TEA detection.