论文部分内容阅读
Nanocrystalline indium oxide powders were prepared by microemulsion and then Y_2O_3 and Nd_2O_3 doped In_2O_3 were synthesized separately by impregnation and chemical co-deposition. The structure and morphology were characterized by XRD and TEM, respectively. Gas sensing properties were tested at static state. The results show that homogeneous indium oxide nanopowder with main grain size of 20 nm can be obtained from microemulsion after sintered at 600 ℃ for 1 h. Pure indium oxide gas sensor has higher sensitivity to gasoline than that to ethanol, HCHO, C_6H_6, NH_3, C_4H_ 10, but the selectivity is not as well as sensitivity. The sensors response (R_a/R_g) is greatly promoted by doping Y_2O_3 and Nd_2O_3 doping. The doped sample shows satisfying sensitivity and selectivity to gasoline at 3.0 V working voltage, and the sensor response for 5.0% Y_2O_3 doped sample is found to reach a maximum as large as 285.1 and the power consumption is only around 200 mW.
Nanocrystalline indium oxide powders were prepared by microemulsion and then Y_2O_3 and Nd_2O_3 doped In_2O_3 were synthesized separately by impregnation and chemical co-deposition. The structure and morphology were characterized by XRD and TEM, respectively. show that homogeneous indium oxide nanopowder with main grain size of 20 nm can be obtained from microemulsion after sintering at 600 ° C for 1 h. Pure indium oxide gas sensor has higher sensitivity to gasoline than that to ethanol, HCHO, C_6H_6, NH_3, C_4H_10 The sensors response (R_a / R_g) is greatly promoted by doping Y_2O_3 and Nd_3 doping. The doped sample shows satisfying sensitivity and selectivity to gasoline at 3.0 V working voltage, and the sensor response for 5.0% Y_2O_3 doped sample was found to reach a maximum as large as 285.1 and the power consumption was only around 200 mW.