NaAc Effect on the Anodization Formation of TiO2 Nanotube Arrays in Glycerol Based Electrolytes

摘要

Effect of NaAc on the anodic growth of TiO2 nanotube arrays is described.NaAc-added approach yields longer nanotubes relative to samples grown from NaAc-free electrolyte.And the growth rate ofTiO2 nanotubes has pH independency in NaAc-added electrolytes.The key to achieve a high aspect ratio TiO2 nanotube arrays is to decrease the chemical dissolution rate at the mouth of the tube by adding NaAc as protective coating.Adsorption of Ac-species on the TiO2 surface is shown to markedly decrease the chemical dissolution rate of the tube mouth,resulting in longer nanotube length.