Highly Sensitive p-SmFeO3/p-YFeO3 Planar-Electrode Sensor for Detection of Volatile Organic Compounds

Nanocomposites of SmFeO3/YFeO3 (1:0, 0.8:0.2, 0.6:0.4, 0.4:0.6, 0.2:0.8, and 0:1) with different molar proportions were prepared by the sol–gel method. The material’s properties characterized various test methods, such as scanning-electron microscopy (SEM) X-ray photoelectron-diffraction spectrometry (XPS). gas-sensing characteristics sensor tested in darkness under illumination using monochromatic light selected wavelengths. results show that ratio 0.4:0.6 had highest gas response to volatile organic compound (VOC) gases optimum operating temperature was lower (120 °C). improved sensor’s sensitivity gas. Under 370-nanometer illumination, responses 30 ppm ethanol, acetone, methanol 163.59, 134.02, 111.637, respectively, which 1.35, 1.28, 1.59 times higher, than those without light. high mainly due adsorption oxygen on surface formation a p–p heterojunction. sensor, can respond VOC gases, be used detect safety unknown environments provide timely warning presence dangerous working environments.