Studies on QCM-type NO2 Gas Sensor Based on Graphene Composites at Room Temperature

Synthetic graphene composite was modified on a transducer of quartz crystal microbalance(QCM) to fabricate a gas sensor for low concentration nitrogen dioxide(NO₂) detection. The gas sensing properties of the QCM coated with SnO₂-rGO and AgNPs-SnO₂-rGO composites were investigated when exposing QCM to low NO₂ con-centration(2.05-20.5 mg/m³) atmosphere at room temperature. The sensing performances of the QCM with AgNPs-SnO₂-rGO composites were enhanced by the introduction of Ag nanoparticles, and the QCM modified with AgNPs-SnO₂-rGO composites could detect NO₂ at room temperature.