Journal
MICROCHIMICA ACTA
Volume 184, Issue 10, Pages 3713-3720Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-017-2364-3
Keywords
CO2 gas sensor; Lanthanumoxide; Combustion gas; Car exhaust gas; Raman studies
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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 photoelectron 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.
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