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• Gas sensor was prepared using 1.5 × 1 mm plane electrodes. • The sensor's response was 128.1 to 30 ppm acetone under 370 nm light illumination. • Multi-wavelength light illumination improved the sensor's response to acetone. • The optimal working temperature of the YFeO 3 (700 °C) sensor was 110 °C. In this study, perovskite yttrium ferrite (YFeO 3) nanomaterials were fabricated using the sol–gel method and used to prepare acetone sensors with planar electrode. These samples were characterized by various characterization equipment. The YFeO 3 planar electrode sensor's response was investigated in the dark and under multi-wavelength light illumination. The planar electrode sensors exhibited typical p-type semiconductor gas sensing behavior, and the optimal operating temperature was 110 °C. The sensor had a high response of 128.1 for 30 ppm acetone under 370 nm light illumination, which was 65 % higher than that in the dark. In addition to their high response value and low working temperature, the sensors also had low power consumption and good stability, which improves the benchmark for further expanding the application of acetone sensors in the future. [ABSTRACT FROM AUTHOR]

• Gas sensor was prepared using 1.5 × 1 mm plane electrodes. • Light illumination improved the sensor's response to gases. • The response of the SmFeO 3 sensor under light to 30 ppm acetone was 29.228. • The SmFeO 3 sensor has a low working temperature of 120 °C. In this study, we prepared SmFeO 3 nanopowders by the sol–gel method. The planar electrode sensor (1.5 × 1 mm) based on SmFeO 3 nanopowder is responsive to methanol, ethanol, acetone, and other gases. Different wavelengths (470 nm, 420 nm, and 370 nm) of light illumination affect the sensor's response to gas. The response under light illumination (370 nm, 98 mW) at 120 °C to 30 ppm methanol, ethanol, and acetone were 26.41, 23.804, and 29.228, which were 2.0, 1.4, and 1.4 times higher than those in the dark, respectively. The planar electrode sensor can reduce optimum working temperature and reduce energy consumption, so it has great potential for application in real life. [ABSTRACT FROM AUTHOR]