Characterization of Quartz Crystal Microbalance Sensors Coated with Graphene Films

Quartz crystal microbalance (QCM) modified with graphene has been fabricated using solution drop-coating method and used for the detection of formaldehyde. Measurement was based on frequency shifts due to the adsorption of vapor at the surface of modified electrode. It was found that frequency shifts were linear to the concentrations of analytes in the range of 10 and 100 ppm with the correlation coefficients of above 0.996. The influence of humidity on the sensor was also examined. Results showed that the humidity effects were innegligible.