JIA Xiaohua, FAN Huiqing

（State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, 

Northwestern Polytechnical University, Xi'an 710072）

Abstract: CdSnO₃ nanoparticles were prepared by a chemical co-precipitation synthesis method, in which the preparation conditions were carefully controlled. The n-type gas-sensing semiconductors were obtained from the as-synthesized powders calcined at 600℃ for 1h. The phase and microstructure of the obtained nanoparticles were characterized by X-ray diffraction(XRD), transmission electron microscopy (TEM). CdSnO₃ has a small particle size of about 100 nm with cubic shape. The gas sensors fabricated by CdSnO₃ nanoparticles had good sensitivity and selectivity to C₂H₅OH vapor, the value of gas sensitivity to 100 ppm C₂H₅OH gas can reach 11.2 times.

Key words: compound oxides, gas sensor, co-precipitation, CdSnO₃