Current voltage measurement of nanostructured Zinc Oxide immerse at different time for humidity sensor applications

This paper focus on current-voltage (IV) measurement of nanostructured Zinc Oxide (ZnO) immersed at different time for humidity sensor application. ZnO thin films were prepared using sol-gel method and deposited by spin coating technique. Different immerse times have been optimized to study the effects on the structural properties of nanostructured ZnO. Immerse time at 1 hour, 6 hour, 16 hour and 24 hour was observed. The surface, structural morphology, optical and electrical properties of the thin film were characterized using Scanning Electron Microscopy (SEM), X-ray diffractometer (XRD), UV-Vis spectroscopy and 1-V measurement respectively. Results from SEM indicate that different immerse times would result different nanostructured ZnO surface morphologies. The XRD spectra indicate different growth orientation with high crystallinity of nanostructured ZnO. UV-VIS spectra indicate that immerse at different time affect the absorption and transmitting of light. I-V characterization shows the films, exhibit ohmic contact and the resistivity decreased when the relative humidity increased. The result indicates that nanocrystalline of ZnO can be obtained at immerse time between 6 hours until 16 hours. The results suggest that surface morphology, porosity, and electrical properties of Zinc Oxide could be affected by varying immerse time for humidity sensor.