High-performance SO2 gas sensor based on MXene/LaFeO3 nanotubes by electrospinning technology.

Sulfur dioxide (SO₂) is highly toxic, harmful to human health, and seriously pollutes the environment. In the present report, different ratios of MXene (Ti₃C₂T_x) loaded LaFeO₃ nanotubes were obtained through etching and electrospinning techniques. The MXene/LaFeO₃ composites were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy. The characterization results show that there is a good connection between MXene and LaFeO₃. The gas sensitivity test shows that the 4 wt%-MXene/LaFeO₃ nanocomposite material shows higher sensitivity, rapid response and recovery rate, excellent selectivity to SO₂. The MXene/LaFeO₃ sensor demonstrates excellent linear response within the concentration range of 1–50 ppm, enabling precise detection of SO₂. When the SO₂ concentration is 20 ppm, the MXene/LaFeO₃ sensor’s response/recovery time is 92 s and 54 s respectively. This work confirms the advantages of MXene-loaded catalyst in SO₂ gas detection. MXene/LaFeO₃ nanocomposite is a promising candidate material for rapid detection of SO₂. This study provides insights into MXene-based gas sensing materials, laying the theoretical foundation for the development and application of high-performance SO₂ sensors. [ABSTRACT FROM AUTHOR]