1.Thin Film Physics Laboratory, Department of Physics,Shivaji University,Kolhapur,India;2.Department of electronics and computer engineering,Chonnam National University,Gwangju,South Korea;3.Supercritical Fluids & Nano Processes Laboratory,#302 School of Chemical Engineering,Yeungnam University,Gyeongsan,South Korea
Abstract:
Thin films of La2O3 were deposited onto glass substrates by ultrasonic spray pyrolysis. Their structural and morphological properties were characterized by X-ray diffraction, Fourier transform Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photo-electron spectroscopy, Brunauer-Emmett-Teller and optical absorption techniques. The sensor displays superior CO2 gas sensing performance at a low operating temperature of 498 K. The signal change on exposure to 300 ppm of CO2 is about 75%, and the signal only drops to 91% after 30 days of operation.
Graphical abstract Schematic diagram of the CO2 gas sensing mechanism of an interconnected web-like La2O3 nanostructure in presence of 300 ppm of CO2 gas and at an operating temperature of 498 K.
