Abstract
High performance formaldehyde gas sensors are widely needed for indoor air quality monitoring. A modified layer of zeolite on the surface of metal oxide semiconductors results in selectivity improvement to formaldehyde as gas sensors. However, there is insufficient knowledge on how the thickness of the zeolite layer affects the gas sensing properties. In this paper, ZSM-5 zeolite films were coated on the surface of the SnO2 gas sensors by the screen printing method. The thickness of ZSM-5 zeolite films was controlled by adjusting the numbers of screen printing layers. The influence of ZSM-5 film thickness on the performance of ZSM-5/SnO2 gas sensors was studied. The results showed that the ZSM-5/SnO2 gas sensors with a thickness of 19.5 μm greatly improved the selectivity to formaldehyde, and reduced the response to ethanol, acetone and benzene at 350 °C. The mechanism of the selectivity improvement to formaldehyde of the sensors was discussed.
Highlights
Gas Sensors with the ZSM-5 ModifiedFormaldehyde is a kind of toxic gas that is harmful to human health
The SnO2 thick film sensors with commercial ZSM-5 modified layer were prepared by the screen printing technique
The results showed that when the surface of the nano-SnO2 sensitive film was screen printed 5 times with a mass ratio of 1:5 to the ZSM-5 zeolite and the printing oil, a dense ZSM-5 layer with the thickness of 19.5 μm was obtained
Summary
Formaldehyde is a kind of toxic gas that is harmful to human health. The research on rapid detection of formaldehyde can contribute to early prevention and treatment of its pollution and beneficial to the healthcare of the person who may contact this harmful substance by chance. Gas sensors are playing an important role in detection of formaldehyde [3,4,5]. A number of metal oxide semiconductors (MOSs) for formaldehyde measurements have been reported, such as NiO [6], ZnO [7], SnO2 [8], WO3 [9], In2 O3 [10], Co3 O4 [11], and so on. SnO2 is most widely used to measure volatile organic compounds (VOCs) gas in gas sensors
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