期刊
ACTA PHYSICO-CHIMICA SINICA
卷 24, 期 3, 页码 375-378出版社
PEKING UNIV PRESS
DOI: 10.1016/S1872-1508(08)60017-0
关键词
perovskite; LaCoxFe1-xO3; humidity sensitive property
The nanocrystalline LaCoxFe1-xO3 with different concentrations of Co was prepared by polyethylene glycol (PEG) sol-gel method and characterized by differential thermal analysis and thermal gravimetric analysis (DTA-TGA), X-ray diffraction (XRD), and scanning electron microscope (SEM). It was found that the crystal structure of perovskite-type could be obtained at 600 degrees C, and the concentration of Co had significant effects on the solid-state reaction and the average particle size of the obtained nanocrystals. Furthermore, the humidity-sensitive properties of nanocrystalline LaCoxFe1-xO3 were investigated, and it was found that LaCo0.3Fe0.7O3 exhibited higher sensitivity to humidity compared with other samples. The addition of Na2CO3 improved the humidity-sensitive properties of this sample, and made its response to humidity good in the whole humidity range of 11%-95% relative humidity (RH).
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