The formaldehyde sensitivity of LaFe1-xZnxO3-based gas sensor

Rare earth oxides LaFe1-xZnxO3 were synthesized by sol-gel method. The X-ray diffraction patterns (XRD) showed that LaFe1-xZnxO3 oxides are single phase with orthorhombic perovskite structure, they all show p-type semiconducting properties. Among nanocrystalline LaFe1-x Zn x O3 oxides, LaFe0.77Zn0.2...

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Bibliographic Details
Published in:Journal of materials science 2007-12, Vol.42 (24), p.9973-9977
Main Authors: Huang, Shanxing, Qin, Hongwei, Song, Peng, Liu, Xing, Li, Lun, Zhang, Rui, Hu, Jifan, Yan, Hongdan, Jiang, Minhua
Format: Article
Language:English
Subjects:
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
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Summary:Rare earth oxides LaFe1-xZnxO3 were synthesized by sol-gel method. The X-ray diffraction patterns (XRD) showed that LaFe1-xZnxO3 oxides are single phase with orthorhombic perovskite structure, they all show p-type semiconducting properties. Among nanocrystalline LaFe1-x Zn x O3 oxides, LaFe0.77Zn0.23O3 exhibits the highest sensitivity of 44.5 to 100 ppm formaldehyde. The optimal working temperature was found to be around 240 deg C. Moreover the LaFe0.77Zn0.23O3 exhibites short response and recovery time to 100 ppm formaldehyde. The lattice parameter doesn't agree with Vegard's law with the increasing Zn content, and the relative density was 70-80%.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-007-1991-1