Abstract
The LaFeO3 (500–900 °C) powders were prepared using the sol–gel method. Multi-wavelength light illumination improved the LaFeO3 (700 °C) sensor's response. Under the 370 nm light illumination, the LaFeO3 (700 °C) sensor's responses to 30 ppm ethanol and methanol were 154.5 and 109.3 at 110 °C, and the response/recovery times were 70/127 s and 82/136 s. The LaFeO3 planar electrode sensor had a high response value to ethanol and methanol. Its high response value and low working temperature have great potential for gas detection in an unknown environment.
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