Synthesis of p-LaFeO3–n-BaTiO3 Heterojunctions and Their Room Temperature Methanol Sensing Applications

Abstract

LaFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (LFO) and BaTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (BT) were prepared by citrate sol gel method. X-ray diffraction pattern of developed materials were recorded to confirm their crystalline phase formation and for the strain calculations in these materials. (x)LaFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> -(1-x)BaTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (x = 0.10, 0.30, 0.50 and 1.0) composites were developed by solid state method. SEM images of the developed composites confirms their mesoporous structure formation. P-n heterojunctions films of (x)LaFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> -(1-x)BaTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> were prepared on integrated digitized electrodes using spin coating technique. These were further investigated for methanol sensing properties at room temperature (40°C) based on the I-V characteristics. The developed heterojunctions films using these materials are found to exhibit fast response and recovery times (i.e., 4.7 sec. and 3.7 sec respectively).