Investigation on isopropanol sensing properties of LnFeO3(Ln = Nd, Dy, Er) perovskite materials synthesized by microwave-assisted hydrothermal method

The early detection of lung cancer by breath analysis has attracted more and more attention. In this work, high-performance LnFeO 3 (Ln = Nd, Dy, Er) based isopropanol sensors were synthesized by microwave-assisted hydrothermal method. X-ray diffraction, field-emission scanning electron microscope, transmission electron microscope, and UV–visible-near infrared absorption spectrometer were used to analyze the material phase composition, microstructure, and other physical properties. The sensing performance was tested by using a four-channel gas testing chamber. The sensors were tested with low concentrations of isopropanol at high humidity to simulate a real human exhaled breath environment. The low binding energy of the Ln-O bond makes it easy to have chemical reactions, which leads to excellent isopropanol sensing performance. Finally, the gas sensing mechanism of the LnFeO 3 sensor was discussed.