Introduction: A low cost alternative is always needed for the fabrication of
ZnO nanostructured thin film with simplified route and minimum chemical use. In this
study, we report a simple one-step green synthesis of zinc oxide nanostructured thin film
by anodizing of 99 % pure zinc plate in distilled water.
Method: Anodizing was conducted by using two electrodes cell at voltage of 30 V and
the temperature of distilled water was varied from 5 to 25 °C. We observed that the morphology
of ZnO thin film depends significantly on the temperature of the distilled water.
FESEM images showed that ZnO thin film without nanostructures is formed when anodizing
was conducted in distilled water of 5 °C while ZnO nanostructures are formed in
the distilled water with anodizing temperature between 10 °C to 25 °C. The density of
the ZnO nanostructures increases with the temperature of distilled water.
Conclusion: Energy-dispersive X-ray spectroscopy analysis showed that Zn and O species
are present in both ZnO thin films formed at 5 °C and 25 °C, respectively. X-ray diffraction
results confirmed that ZnO is present in all Zn plates that were anodized in distilled
water ranged from 5 to 25 °C. The intensities of the peaks in XRD patterns corresponding
to ZnO increase as the temperature of the distilled water increased from 5 to 25
°C. Photoluminescence spectra of the anodized Zn plate show 2 emissions, at around
380-400 nm and at 650 nm respectively, regardless of the temperature of the distilled