The formaldehyde sensitivity of LaFe sub(1-x)Zn sub(x)O sub(3)-based gas sensor

Rare earth oxides LaFe sub(1-x)Zn sub(x)O sub(3) were synthesized by sol-gel method. The X-ray diffraction patterns (XRD) showed that LaFe sub(1-x)Zn sub(x)O sub(3)oxides are single phase with orthorhombic perovskite structure, they all show p-type semiconducting properties. Among nanocrystalline La...

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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:
Density
Formaldehyde
Lattice parameters
Nanocrystals
Optimization
Oxides
P-type semiconductors
X-rays
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Summary:Rare earth oxides LaFe sub(1-x)Zn sub(x)O sub(3) were synthesized by sol-gel method. The X-ray diffraction patterns (XRD) showed that LaFe sub(1-x)Zn sub(x)O sub(3)oxides are single phase with orthorhombic perovskite structure, they all show p-type semiconducting properties. Among nanocrystalline LaFe sub(1-x)Zn sub(x)O sub(3) oxides, LaFe sub(0.77)Zn sub(0.23)O sub(3) exhibits the highest sensitivity of 44.5 to 100 ppm formaldehyde. The optimal working temperature was found to be around 240 C. Moreover the LaFe sub(0.77)Zn sub(0.23)O sub(3) 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
DOI:10.1007/s10853-007-1991-1