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The humidity-sensing characteristics of ZnO nanostructures are investigated using a quartz crystal microbalance (QCM) measurement. ZnO nanostructures are synthesized via sol–gel route in nanoparticle (ZnO-NP) and nanowire (ZnO-NW) morphologies with diameter about 20–30nm. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods are used to determine the morphology and crystal structure...