Abstract
The study proposes SO2 gas sensor based on a quartz crystal microbalance (QCM) coated with Ag@GO heterogeneous nanomaterial at room temperature. The heterogeneous nanomaterial was synthesized by hydrothermal method at 160 C for 90 min. The structure and morphological characteristics were analyzed by using field-emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy. The Ag@GO heterogeneous nanomaterial was dispersed in water and coated on an Au electrode of QCM via spray coating method. The fabricated sensor exhibits a good response to SO2 in the concentration range of 2.5-15 ppm. The highest gas sensitivity of the sensor is 8.98 Hz/ppm corresponding to the adsorbed SO2 mass density of 2.38 μg.cm-2. The gas sensing results indicated that the developed sensor can be applied for monitoring, warning, and controlling SO2 in the environment. Moreover, the gas adsorption properties of Ag@GO nanomaterial can also be considered for a filter to remove toxic gases in respirators and environmental treatment.
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