Abstract
A sensitive an impedancemetric acetylene (C2H2) gas sensor device could be fabricated by using perovskite-type SmFeO3 thin-film as a sensor material. The uniform SmFeO3 thin-films were prepared by spin-coating and focusing on the effects of polymer precursor solutions. The prepared precursors and thin-films were characterized by means of thermal analysis, Fourier-transform infrared spectroscopy, ultraviolet–visible spectroscopy, X-ray diffraction analysis, scanning electron microscopy and X-ray photoelectron spectroscopy. It was found that particle growth and increase in homogeneity of the prepared thin-film could be accelerated by the addition of acetyl acetone (AcAc) as a coordination agent in the polymer precursor solution. Moreover, the highly crystallized thin-film-based sensor showed good response properties and stabilities to a low C2H2 concentration between 0.5 and 2.0 ppm.
Highlights
Hydrocarbon gases are mostly toxic and flammable; for example, automobile exhaust and industrial plant soot contain carbon monoxide (CO), nitrogen oxide (NOX ) and hydrocarbons (HCs) which cause various environmental issues
In the case of the AcAc0 powder, the DTA curve showed a large exothermic reaction with a weight loss at ca. 180 ◦ C, which corresponds to the pyrolysis of remaining ethylene glycol (EG) and nitrates of the starting materials
The impedancemetric C2 H2 sensor was fabricated by using SmFeO3 thin-films prepared by a polymer precursor method
Summary
Hydrocarbon gases are mostly toxic and flammable; for example, automobile exhaust and industrial plant soot contain carbon monoxide (CO), nitrogen oxide (NOX ) and hydrocarbons (HCs) which cause various environmental issues. In the agro-food field, ethylene (C2 H4 ) is known as a growth hormone for vegetables and fruits [1,2]. C2 H2 , the detection gas in this study, is an important industrial gas, which has been used in the field of synthetic chemistry as a starting material of benzene and poly-acetylene. It is known that C2 H2 is generated from the insulating oil of transformers when the oil becomes deteriorated. A C2 H2 sensor should be used for on-site monitoring of the transformer, in spite of the generated C2 H2 having a low concentration of 0.5 ppm or lower [3,4,5]. Studies about C2 H2 sensors have recently increased in number due to the importance of C2 H2 detection
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