Effect of Lanthanides on Acetone Sensing Properties of LnFeO₃ Nanofibers (Ln = La, Nd, and Sm)

Abstract

LnFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (Ln = La, Nd, and Sm) nanofibers are synthesized by the electrospinning, and characterized by X-ray diffraction, field-emission scanning electron microscopy, and X-ray photoelectron spectroscopy. For investigating the effect of lanthanide on acetone sensing properties of LnFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> nanofibers, the side-heating gas sensors based on LnFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> nanofibers are fabricated and measured at different temperatures and acetone concentrations. The optimal working temperatures of the LnFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> gas sensors are all 140 °C. When the LnFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> gas sensors are exposed to 100 ppm and acetone at 140 °C, the SmFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> sensor exhibits the largest sensing response (Response = 9.98) compared with LaFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> and NdFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> gas sensors, and the response and recovery times of SmFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> sensor are about 17 and 16 s, respectively. The results indicate that the lanthanides have an impact on the acetone sensing properties of LnFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> , and the lanthanide with low binding energy of the Ln-O bond is beneficial for improving the acetone sensing properties of LnFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> .