Gas-sensing Selectivity of N-Zno/p-co3o4 Sensors for Homogeneous Reducing Gas
Journal of physics and chemistry of solids(2021)
Abstract
Poor selectivity has always been the most severe challenge in the practical applications of gas sensors based on metal-oxide semiconductors (MOSs). It is difficult to distinguish CO and H-2 because of the cross-sensitivity phenomenon. Herein, a series of n-ZnO/p-xCo(3)O(4) NPs (1:x represents the molar ratio of Zn:Co) was prepared through a simple sol-gel method. Structural and material characterization were performed via X-ray diffraction (XRD) and transmission electron microscopy (TEM), while other techniques were used to assess the gas-sensing properties. The characterization results indicated that the oxides in the n-ZnO/p-0.61Co(3)O(4) NPs formed p-n heterojunction instead of being dissolved together. The gas sensing results confirmed that the Zn:Co molar ratio influenced the gas-sensing selectivity of the n-ZnO/p-xCo(3)O(4) NPs. Interestingly, regarding the gas-sensing behavior of n-ZnO/p-0.61Co(3)O(4) NPs, the overall conductance of the film decreased in the presence of CO and increased in the presence of H-2 at the testing temperature of 350 degrees C. This paper provides an approach to address the problem of poor selectivity of MOS-based gas sensors.
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Key words
p-n heterojunction gas sensor,Selectivity,Co3O4,ZnO,XPS
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