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Crystallization and Phase Transition of Titanium Oxide Nanotube Arrays

2008; Wiley; Volume: 91; Issue: 2 Linguagem: Inglês

10.1111/j.1551-2916.2007.02133.x

1551-2916

Yang Yang, Xiaohui Wang, Longtu Li,

Transition Metal Oxide Nanomaterials

The crystallization and phase transition of TiO 2 nanotubes that are >4 μm in length were investigated. The nanotubes initially crystallized in the anatase and rutile phases at 300° and 550°C, respectively. The rutile nucleation occured initially in the nanotube–support interface. On elevating the calcination temperature above 550°C, the rutile crystallites in the nanotube–support interface merged with the nanotubes and finally formed a compact rutile layer at 800°C. During the anatase‐to‐rutile phase transition processing, a (004) preferential orientation occurred due to the regular arrangements of the nanotubes onto the titanium substrate.