Enhanced NH3 gas sensing properties of a QCM sensor by increasing the length of vertically orientated ZnO nanorods

▸ Vertically aligned ZnO nanorods were directly synthesised on a substrate by a simple low-temperature hydrothermal method. ▸ Highly sensitive mass-type NH3 gas sensor was fabricated by using QCM coated with ZnO nanorods. ▸ Increasing in the length of ZnO nanorods will increase the sensitive surface area and sensing characteristics.