Using a seed layer-free hydrothermal method, ZnO nanorods (NRs) were deposited on\nST-cut quartz surface acoustic wave (SAW) devices for ammonia sensing at room temperature. For a\ncomparison, a ZnO film layer with a thickness of 30 nm was also coated onto an ST-cut quartz SAW\ndevice using a sol-gel and spin-coating technique. The ammonia sensing results showed that the\nsensitivity, repeatability and stability of the ZnO NR-coated SAWdevice were superior to those of\nthe ZnO film-coated SAW device due to the large surface-to-volume ratio of the ZnO NRs.
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