Electric properties and acetone-sensing characteristics of La1−xPbxFeO3 perovskite system

Abstract La1−xPbxFeO3 (x = 0.0–0.5) ceramic powders with orthogonal perovskite structure were prepared using sol–gel method. With the increasing Pb content x, the conductivity for La1−xPbxFeO3 increases to a maximum value at x = 0.2, then falls off to minimum value at x = 0.32, and finally increases again. Among ceramics La1−xPbxFeO3 (x ≤ 0.5), the sample La0.68Pb0.32FeO3 with x = 0.32 shows the best sensitivity to acetone gas. La0.68Pb0.32FeO3 ceramics with high sensitivity, low operating temperature to acetone gas, excellent stability in air and short response and recovery times can be used as a new type of gas-sensing material for detecting acetone gas.

[1]  G. Mangamma,et al.  EFFECTS OF SILICA ADDITIONS ON H2S SENSING PROPERTIES OF CUO-SNO2 SENSORS , 1998 .

[2]  Richard J. Ewen,et al.  Highly sensitive mixed oxide sensors for the detection of ethanol , 2002 .

[3]  N. N. Toan,et al.  Gas sensing with semiconducting perovskite oxide LaFeO3 , 2003 .

[4]  J. Gardner,et al.  An electronic nose system to diagnose illness , 2000 .

[5]  Jagannath,et al.  Room temperature operating ammonia sensor based on tellurium thin films , 2004 .

[6]  Jordi Arbiol,et al.  In2O3 films deposited by spray pyrolysis: gas response to reducing (CO, H2) gases , 2004 .

[7]  H. Qin,et al.  Preparation and ethanol sensitivity of nanocrystalline La0.7Pb0.3FeO3-based gas sensor , 2004 .

[8]  Xinghui Wu,et al.  Preparation and gas-sensing properties of perovskite-type SrFeO3 oxide , 2001 .

[9]  Satoshi Okano,et al.  Air quality prediction by using semiconducting gas sensor with newly fabricated SmFeO3 film , 2004 .

[10]  Muyu Zhao,et al.  Fabrication of La1−xSrxFe1−yCoyO3 sensitive ceramics, nanocrystalline thin films and the manufacture of the NCTF-OSFET gas sensing device , 1996 .

[11]  Yen-Hwei Chang,et al.  The influence of microstructure and deposition methods on CO gas sensing properties of La0.8Sr0.2Co1−xNixO3−δ perovskite films , 1999 .

[12]  L. Kong,et al.  Gas-sensing property and mechanism of CaxLa1−xFeO3 ceramics , 1996 .

[13]  Y. H. Chang,et al.  Characteristics and sensing properties of dipped La0.8Sr0.2Co1−xNixO3−δ film for CO gas sensors , 1999 .

[14]  Yen-Hwei Chang,et al.  The structure, electrical and sensing properties for CO of the La0.8Sr0.2Co1−xNixO3−δ system , 1999 .

[15]  Xiaohua Zhou,et al.  Study on sensing mechanism of CuO–SnO2 gas sensors , 2003 .