Gas-Sensing Properties of Nano-LaFeO3 Prepared by a Simple Molten-Salt Method

作者：Jiang Dongli^*; Chu Xiangfeng

来源：Rare Metal Materials and Engineering, 2009, 38(10): 1848-1851.

• LaFeO3
• molten-salt method
• triethylamine
• gas-sensing properties

Nanocrystalline LaFeO3 was prepared by a simple molten-salt method with La2O3 and FeCl3 center dot 6H(2)O as main starting materials. The nanocrystalline samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM) for the phases and morphology. Their gas-sensing properties to triethylamine, C2H5OH, gasoline, C6H6 and CH3COCH3 were investigated. The results demonstrated that pure LaFeO3 nanocrystalline with uniform grain sizes and an average diameter of about 40 nm was formed when calcined at 800 degrees C. Moreover, the gas sensor made of the nanocrystalline LaFeO3 sample showed high sensitivity as well as good selectivity to dilute triethylamine. The LaFeO3 sensor showed the sensitivity as high as 7.9 to even 25 mu g/g triethylamine at 250 degrees C, and the response and recovery time are 6 and 13 s, respectively.

• 出版日期2009-10
• 单位桂林医学院; 中山大学