Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (03): 375-378.doi: 10.1016/S1872-1508(08)60017-0

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Synthesis, Characterization and Humidity Sensitive Properties of Nanocrystalline LaCoxFe1-xO3

WANG Zhu-Yi; CHEN Cheng; FENG Cai-Hui; WANG Jin-Xing; ZOU Bo; ZHAO Meng; WU Feng-Qing   

  1. College of Chemistry, Jilin University, Changchun 130023, P. R. China
  • Received:2007-10-13 Revised:2007-12-03 Published:2008-03-10
  • Contact: WU Feng-Qing

Abstract: 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 ℃, 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).

Key words: Perovskite, LaCoxFe1-xO3, Humidity sensitive property


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