Self-Organized and High Aspect Ratio Nanoporous Zinc Oxide Prepared by Anodization

摘要

We have fabricated self-organized nanoporous zinc oxide having an extremely high aspect ratio by a simple, high throughput and non-costly wet electrochemical process without use of catalyst: anodization of zinc plate in aqueous solutions. By optimizing the anodizing condition, we could obtain a film with the thickness more than 90 nm. BET specific surface area of the anodic porous ZnO was approximately 28.5 m~2/g. XRD measurement of the anodic ZnO reveals diffraction spectra of polycrystalline ZnO. From UV and visible light optical absorption spectra of thick anodic ZnO films, the absorption edge and the estimated band gap were 370 nm and 3.35 eV respectively. Photo catalytic activity of the anodic ZnO was ascertained by a methylene blue degradation test under UV irradiation at the wavelength of 365 nm. The proposed process with use of anodization of zinc could be expanded to other metals to obtain various oxides semiconductors, and has potential technological applications in the fields of catalysis, supports, and sensors.