Enhanced Formaldehyde Sensing Performance Based on SnO2 Nanosheets/Titanium Carbide (MXene) Composites

SnO
2
/MXene composites were synthesized by a facile hydrothermal method, where the SnO
2
nanosheets grew evenly on the surface of MXene flakes. Compared with the pure SnO
2
, the 5% MXene-SnO
2
based sensor displayed optimal formaldehyde sensing performance at a lower operating temperature of 160 °C. Furthermore, the sensor with 5% MXene-SnO
2
also showed high response, good selectivity, excellent reproducibility, and a good linearity over the concentration of 1–100 ppm.