The stannic oxide (SnO2) was modified using Quasi-Molecular imprinting method. The morphology and structure of the modified SnO2 were characterized by X-ray diffraction (XRD), and transmission electron microscopy (SEM). The gas-sensing performance of the modified and unmodified SnO2 sensors was compared, and the mechanism of MIP technique in improving the gas-sensing performance of SnO2 was discussed. The selective test results showed that the improved SnO2 gas sensor exhibited good gas sensitivity to formaldehyde. The SnO2 gas sensor with good formaldehyde gas selectivity achieved precise measurement of continuous formaldehyde concentration. The response value to 100 ppm formaldehyde was 100°C at 230°C. The synthesis of SnO2 was discussed, and the mechanism of improving gas-sensing performance after modification was analyzed.
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