Sun Yanhui, Wang Jing, Li Xiaogan, Du Haiying, Huang Qingpan, Wang Xiaofeng
Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China.
College of Information & Communication Engineering, Dalian Minzu University, Dalian 116600, China.
Sensors (Basel). 2018 Jan 29;18(2):390. doi: 10.3390/s18020390.
In order to improve the sensing properties of tin dioxide gas sensor, four kinds of different SiO₂/Al₂O₃ ratio, different particle size of MFI type zeolites (ZSM-5) were coated on the SnO₂ to prepared zeolite modified gas sensors, and the gas sensing properties were tested. The measurement results showed that the response values of ZSM-5 zeolite (SiO₂/Al₂O₃ = 70, grain size 300 nm) coated SnO₂ gas sensors to formaldehyde vapor were increased, and the response to acetone decreased compared with that of SnO₂ gas sensor, indicating an improved selectivity property. The other three ZSM-5 zeolites with SiO₂/Al₂O₃ 70, 150 and 470, respectively, and grain sizes all around 1 μm coated SnO₂ sensors did not show much difference with SnO₂ sensor for the response properties to both formaldehyde and acetone. The sensing mechanism of ZSM-5 modified sensors was briefly analyzed.
为了提高二氧化锡气体传感器的传感性能，将四种不同SiO₂/Al₂O₃比例、不同粒径的MFI型沸石（ZSM-5）涂覆在SnO₂上制备沸石修饰气体传感器，并测试其气敏性能。测量结果表明，与SnO₂气体传感器相比，涂覆ZSM-5沸石（SiO₂/Al₂O₃ = 70，粒径300 nm）的SnO₂气体传感器对甲醛蒸汽的响应值增加，对丙酮的响应降低，表明选择性有所提高。另外三种SiO₂/Al₂O₃分别为70、150和470且粒径均在1μm左右的ZSM-5沸石涂覆的SnO₂传感器，在对甲醛和丙酮的响应性能方面与SnO₂传感器没有太大差异。简要分析了ZSM-5修饰传感器的传感机制。
