Crescimento de filme de ZnO nanoestruturado por anodização de aço galvanizado

Abstract

Zinc oxide (ZnO) is a broad bandgap semiconductor (3.37 eV) with a wide range of applications, such as catalysts, piezoelectric actuators and transducers, solar cells, microsensors, among others. One way of obtaining ZnO is through the controlled oxidation of metallic zinc, which is the third most consumed metal in the world among the non-ferrous metals with the galvanizing industry being responsible for approximately 57% of the worldwide consumption of this metal. Anodizing is a process of surface treatment consisting of creating an oxide film on the metal surface, being able to retain large amounts of dye. ZnO was obtained by anodizing the galvanized steel which was carried out in a 5mM NaHCO3 electrolytic solution at a constant voltage of 35V with an initial current of 0.2A for 8 minutes. Chemical characterization of the anodized surface, thickness of the layer and verification of the morphology obtained were verified, where it was verified the production of na-nofios with about 100nm of diameter. N479 Black Dye commercial dye was deposited. The results showed the obtaining of a homogeneous layer, with the morphology of nanowires with great layer-city of dye absorption.