H2-Sensing Characteristics of Nanocrystalline La0.8Pb0.2FeO3 Prepared by Sol–Gel Method.

Abstract Nanocrystalline La0.8Pb0.2FeO3 has been prepared by the sol-gel method. XRD patterns show that the nanocrystalline La0.8Pb0.2FeO3 is a perovskite phase with the orthorhombic structure and its mean crystallite size is about 19 nm. The influence of Pb ions which replaced the La ions on A-sites can be directly observed from the electrical and sensing properties to H2 gas. The conductance of La0.8Pb0.2FeO3-based sensor is considerably higher than that of LaFeO3-based sensor, and Pb-doping can enhance the sensitivity to H2 gas. An empirical relationship of <img src="/fulltext-image.asp?format=htmlnonpaginated&src=XW65044852787523_html\10971_2005_Article_3216_TeX2GIFIEq1.gif" border="0" alt="$$R=K {C^{\alpha}_{H_{2}}}$$" /> with α = 0.668 was obtained. [ABSTRACT FROM AUTHOR]