An Innovative Approach to Synthesize Highly-Ordered TiO₂ Nanotubes

Abstract

An innovative route to prepare highly-ordered and dimensionally controlled TiO2 nanotubes has been proposed using a mild sonication method. The nanotube arrays were prepared by the anodization of titanium in an electrolyte containing 3% NH4F and 5% H2O in glycerol. It is demonstrated that the TiO2 nanostructures has two layers: the top layer is TiO2 nanowire and underneath is well-ordered TiO2 nanotubes. The top layer can easily fall off and form nanowires bundles by implementing a mild sonication after a short annealing time. We found that the dimensions of the TiO2 nanotubes were only dependent on the anodizing condition. The proposed technique may be extended to fabricate reproducible well-ordered TiO2 nanotubes with large area on other metals.

Photocatalytic activities of Pt/ZIF-8 loaded highly ordered TiO2 nanotubes

“…The TiO 2 NTs were prepared by means of the anodizing process that we have developed in our group and reported previously. 20,21 The Ti foil (0.8 mm in thickness and 99.6% in purity) and all chemicals were purchased from Alfa-Aser (Ward Hill, MA, USA). Prior to anodization, the titanium foil was cleaned using distilled water and acetone by means of ultrasonic bath.…”

Synthesis of high‐aspect‐ratio, top‐open and ultraflat‐surface TiO2 nanotubes through double‐layered configuration

“…Moreover, to facilitate electrolyte infiltration, tube filling or surface functionalization, well‐defined openings are required. Generally, the as‐anodized samples have to be ultrasonically treated with moderate ultrasound energy for several minutes to reach top‐open morphology 13–16. However, the surface after the treatment becomes rather rough and cracked.…”