Resistive gas sensors based on MoS2 nanosheets with high response to low NO2 concentrations

This work reports on two-dimensional MoS
2
nanomaterial-based resistive gas sensors and their response to sub-ppm NO
2
concentrations. The sensitive material was prepared by drop-casting MoS
2
nanosheet dispersions on silicon nitride suspended membranes. The sensor response was studied at operating temperatures up to 300 °C. The fabricated sensors provided good responses to NO
2
concentrations as low as 20 ppb at room temperature. The n-type MoS
2
sensing mechanism is here discussed.