Hybrid perovskite quantum dot-MWCNTs gas sensor for selective ethanol sensing

Quantum dots and carbon nanotubes are advanced nanomaterials that show excellent electrical, mechanical, and optical characteristics. This paper proposes perovskite quantum dots (PQDs) grown on the lattice of Multi-Wall Carbon Nanotubes (MWCNTs) as an efficient gas sensor. The developed sensor shows ethanol selectivity when tested with methanol, hexane, benzene, and ethyl acetate at room temperature. It exhibited fast response and recovery times of 15.17 and 2.64 s, respectively, at 10 ppm ethanol with 90% relative humidity. Essential sensor characteristics like sensitivity, stability, repeatability, and scalability are achieved in these sensors. These remarkable sensor characteristics make PQDs/MWCNTs highly attractive for real-world ethanol monitoring applications at ambient temperature. Graphical Abstract