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A novel route to large-scale and robust free-standing TiO 2 nanotube membranes based on N 2 gas blowing combined with methanol wetting

2011; IOP Publishing; Volume: 22; Issue: 24 Linguagem: Inglês

10.1088/0957-4484/22/24/245602

1361-6528

Ghafar Ali, Seung Hwa Yoo, Jong Min Kum, Yong Nam Kim, Sung Oh Cho,

Ga2O3 and related materials

We present a novel and straightforward approach to fabricate large-scale and robust free-standing TiO2 nanotube (TNT) membranes. Simply by blowing N2 gas onto as-anodized TNTs that are wetted with methanol, free-standing TNT membranes are produced. The approach also provides homogeneous and honeycomb-like Ti substrates after the detachment of TNT membranes. Through the second anodization of the honeycomb-like Ti substrates following the N2 blowing, TNT membranes comprising hexagonally close-packed and regularly ordered TNTs with clear open ends can be achieved. Characterization of the free-standing TNT membranes using Raman spectroscopy and a high-resolution transmission electron microscope reveals that anatase TiO2 and crystalline graphitic carbon are embedded in the bottom surface of the free-standing TNT membranes.