▎ 摘　　要

In this paper, composite film based on polyvinylpyrrolidone (PVP)/graphene oxide (GO) was fabricated by spray method on AT-cut 9.986 MHz quartz crystal microbalance (QCM) for NH3 sensing. The thin films were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible spectroscopy (UV-VIS) to investigate the morphologies and the composition contents, respectively. The experimental results reveal that PVP/GO based sensor holds higher sensitivity, larger responsiveness and smaller baseline drift than those based on pure PVP at room temperature. Besides, the prepared sensor exhibits greater response to NH3 than other gases such as CO, CO2 and NO2 at the same concentration. The good linearity, reproducibility and stability demonstrate the practicability of PVP/GO hybrid film in detecting NH3.