Highly sensitive and selective Love mode surface acoustic wave ammonia sensor based on graphene oxides operated at room temperature
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It is crucial to develop highly sensitive and selective sensors for ammonia, one of the most common toxic gases which have been widely used in pharmaceutical, chemical, and manufacturing industries. In this study, graphene oxide (GO) film was spin-coated onto surfaces of ST-cut quartz surface acoustic wave (SAW) devices with a resonant frequency of 200 MHz for ammonia sensing. The oxygen-containing functional groups (such as hydroxyl and epoxy ones) on the surface of GO film strongly absorb ammonia molecules and thus increase the film stiffness. This is attributed to the main ammonia sensing mechanism of the Love mode SAW devices, which show not only a positive frequency shift of 620 Hz for 500 ppb ammonia gas, but also an excellent selectivity (as compared to other gases such as H2, H2S, CO, and NO2) and a good reproducibility, operated at room temperature of 22 °C.
The authors acknowledge the support by the Fundamental Research Funds for the Central Universities (A03018023801119), and Funding supports from the UK Engineering Physics and Science Research Council (EPSRC EP/P018998/1), Newton Mobility Grant (IE161019) through Royal Society and NFSC, and Royal academy of Engineering UK-Research Exchange with China and India are also acknowledged.
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