Inspired by recent development of one-dimensional nanoscale materials with large specific surface area and intriguing properties, in this study c-axis vertically aligned ZnO nanorod arrays were synthesized on the langasite thickness shear mode bulk acoustic wave resonator through a simple hydrothermal route for potential gas sensing application. The ZnO nanorods are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) for phase and microstructure identification. The nanorods have a diameter of 30 to 100 nm and a length of about several hundred nanometers. The langasite high temperature gas sensor fabricated from ZnO nanorod arrays showed a high sensitivity to NO2 and NH3 at 300°C. The results demonstrate that the use of the ZnO nanorod arrays on langasite acoustic wave resonator can greatly enhance the sensitivity and sensor response-speed due to the fast surface/interface reaction and improved surface characteristics.
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