Low-cost sensors based on nanoparticles of tin dioxide decorated with graphene to detect ultra-low NO2 concentrations at room temperature

I. Sayago, C. Sánchez-Vicente, J.P. Santos
Eurosensors XXXIV, Lecce, Italy
Del 10 al 13 de septiembre de 2023

Chemical nanosensors based on nanoparticles (NPs) of pure tin dioxide (SnO₂) and graphene-decorated tin dioxide, were developed and characterized for the detection of pollutant gases. Sensitive layers were prepared by drop casting method. Photoactivation of the sensors allows the detection of ultra-low NO₂ concentrations (50 ppb) at room temperature. The sensors shows high responses to NO₂ and low ones to other tested polluting gases (CO, CH₄ and CO₂). The effect of humidity and the presence of graphene on sensor response were studied.