In order to improve the sensitivity of the gas sensor,the SnO_2 gas sensor was modified with Y-zeolite by coating Y-zeolite on the surface of SnO_2 and mixing SnO_2 and Y-zeolite,respectively. The structure andsurface properties of the composites made by mixing SnO_2 and Y-zeolite were characterized by using X-ray diffraction( XRD) and scanning electron microscopy( SEM),respectively. Some VOC gases were tested by using these two types of sensors.The results show that compared with pure SnO_2 gas sensor,the ...