Abstract
Acetone is a colourless volatile organic compound naturally occurs in the environment in plants and animals, tobacco smokes, vehicle exhausts, volcanic gases and landfills etc. But getting exposed to acetone can cause irritation in eyes, nose or skin leading to acetone poisoning. Besides, acetone detection is considered as a biomarker in the field of clinical diagnosis for the detection of type-1 diabetics. Therefore, various materials have been tested for a long time for the detection of acetone. LaFeO3, a rare-earth composite metal oxide semiconductor material has shown good chemical stability and physical response towards acetone sensing. In this work, sol–gel method has been used to synthesize LaFeO3 perovskite by taking different molar ratios of lanthanum and iron precursors, using the cationic surfactant Cetyl Tetramethyl Ammonium Bromide (CTAB) as the structure directing agent. X-ray diffraction studies (XRD) and scanning electron microscopy (SEM) were employed to study morphology and composition of the synthesized material. XRD patterns confirms the effective preparation of single-phase perovskite (LaFeO3) without any crystalline impurities like Fe2O3 or La2O3 and the crystallinity nature increases with the increasing temperatures at which the three different samples of LaFeO3 were calcined (700 °C, 800 °C and 900 °C). SEM results confirm that the shape of all the particles in the samples is almost hexagonal and porous in nature. Taking the samples of LaFeO3, calcined at different temperatures, thin films were deposited on glass substrate for the study of their electrical properties by Hall effect characterization and also current–voltage (I-V) characteristic study to understand the principle behind acetone detection for a temperature range of 300 K to 373 K.
Published Version
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