A New Benchmark for TiO2 Nanotube Array Growth by Anodization
Citations Over TimeTop 1% of 2007 papers
Abstract
We report on the anodic formation of a self-standing 720 μm thick TiO2 nanotubular membrane by complete consumption of a 250 μm thick titanium foil sample. By employing double sided electrochemical oxidation of titanium in an electrolyte comprised of water, NH4F, and ethylene glycol, we obtain two highly ordered, hexagonal close-packed titania nanotube arrays 360 μm in length that are separated by a thin compact oxide layer; the individual nanotubes in each array have an aspect ratio of ∼2200. The potentiostatic anodization of titanium in an ethylene glycol, NH4F, and water electrolyte dramatically increases the rate of nanotube array growth to approximately 15 μm/h, representing a growth rate ∼750−6000% greater than that seen, respectively, in other polar organic or aqueous based electrolytes previously used to form TiO2 nanotube arrays. We consider the effects of electrolyte composition, applied potential, and anodization duration on the length and diameter of the resulting nanotubes in terms of a growth rate model, with results suggesting that reduced hydroxyl ion injection from the electrolyte, which enables faster high field ionic conduction through the barrier layer, is responsible for the high nanotube growth rates achieved. Furthermore, as reported herein for the first time, we are able to make self-standing TiO2 nanotube array films ranging in thickness from 50 to 360 μm.
Related Papers
- → Effect of Electrolyte Temperature and Anodization Time on Formation of TiO2 Nanotubes for Biomedical Applications(2020)101 cited
- → Self-organized Anodic TiO2 Nanotube Layers: Influence of the Ti substrate on Nanotube Growth and Dimensions(2015)45 cited
- → Synthesis of Highly Ordered TiO2 Nanotube in Malonic Acid Solution by Anodization(2008)16 cited
- → Electrochemical Fabrication of Titania Nanotube Arrays with Tunning Nature of Dimethyl Sulfoxide and its Application for Hydrogen Sensing(2012)7 cited
- → Growth of TiO2 Nanotube Arrays (TNAs) by Current Control Anodizing(2016)