Characteristics and Electronic Properties of Self-Organized TiO2 Nanotube Arrays Fabricated on Ti Foil by Square Wave Pulse Anodizing Ti in an HF + H2SO4 Solution

摘要

Self-organized TiO2 nanotube arrays (TNTs) were fabricated by anodizing the Ti foil using a square wave pulse in a HF + H2SO4 solution. The influence of pulse potential and duration on the morphologies and the electronic properties of the TNTs were systematically investigated by SEM, Raman spectra, XRD, EIS and Mott-Schottky plot. SEM results showed that the TNTs appeared in the case of anodizing Ti foil at an initial lower potential, and then at a higher potential. Otherwise, TNTs became degraded and even to disappear thoroughly. EIS and Mott-Schottky results showed that increasing pulse duration and higher pulse potential can increase the corrosion protection of the TNTs, and the crystallinity of the TNTs also obeyed this trend. (C) 2017 The Electrochemical Society.