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• The LaFeO 3 sensor has a low optimum operating temperature of 110 °C. • Multi-wavelength light illumination improved the sensor's response. • The sensor's response to 30 ppm ethanol was 154.5 under 370 nm light illumination. • The sensor's response to 30 ppm methanol was 109.3 under 370 nm light illumination. The LaFeO 3 (500–900 °C) powders were prepared using the sol–gel method. Multi-wavelength light illumination improved the LaFeO 3 (700 °C) sensor's response. Under the 370 nm light illumination, the LaFeO 3 (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 LaFeO 3 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. [ABSTRACT FROM AUTHOR]

The planar electrode sensors of the La 1−x Y x FeO 3 (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) perovskite material were prepared for volatile organic compounds (VOCs) gas detection. The La 1−x Y x FeO 3 (x = 0.8) sensor has a higher gas response than La 1−x Y x FeO 3 (x = 0, 0.2, 0.4, 0.6, and 1) due to a higher surface adsorbed-oxygen content of the material. Light illumination improves the gas response of the La 0.2 Y 0.8 FeO 3 sensor to VOCs gases. A higher gas response of the La 0.2 Y 0.8 FeO 3 sensor was attained as the light-source wavelength was shortened. The gas responses of the La 0.2 Y 0.8 FeO 3 sensor under 370 nm light illumination at 100 °C to 5 ppm ethanol, methanol, acetone, and formaldehyde were 36.369, 32.352, 36.357, and 12.545, respectively. Additionally, at 110 °C, the response to 5 ppm acetylacetone was 35.94. In conclusion, the La 0.2 Y 0.8 FeO 3 planar electrode sensor has greater gas responses and lower operating temperature to VOCs gases. Therefore, the planar electrode sensor can reduce power consumption and be used in various locations with known gases. • The La 1−x Y x FeO 3 gas sensors were prepared using 1.5 × 1 mm plane electrodes. • The La 0.2 Y 0.8 FeO 3 sensor has high responses to VOCs under light illumination. • The plane electrode sensor has a low optimum working temperature of 100 °C. • Multi-wavelength light illumination can improve the gas response of sensor. [ABSTRACT FROM AUTHOR]