NO2 gas sensor based on polyvinylpyrrolidone/reduced graphene oxide nanocomposite

Pure polyvinylpyrrolidone (PVP) film, reduced graphene oxide (RGO) film and PVP/RGO composite film were coated on quartz crystal microbalance (QCM) for nitrogen oxide (NO
₂
) sensing at room temperature. These films were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), respectively. Because only a few RGO were deposited on QCM, the sensor based on RGO almost had no response to NO
₂
. In addition, compared with the response of pure PVP film, an increase in the response of PVP/RGO composite film may be caused by the more absorption area for NO
₂
molecule adsorption.