Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5363295 | Applied Surface Science | 2010 | 7 Pages |
Abstract
Oriented single crystalline titanium dioxide (TiO2) nano-pillar arrays were directly synthesized on the Ti plate in tetramethylammonium hydroxide (TMAOH) solution by one-pot hydrothermal method. The samples were characterized respectively by means of field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD). Results showed that the TiO2 nano-pillar with a tetrahydral bipyramidal tip grew vertically on the titanium substrate. HRTEM and Raman results confirmed that the TiO2 nano-pillar arrays were single crystalline anatase. The controls of morphology, size, and orientation of the nano-pillar could be achieved by varying the solution concentration and hydrothermal temperature. Furthermore, the special morphology of the TiO2 nano-pillar arrays was caused by the selectively absorption of the tetramethylammonium (TMA) through hydrogen bonds on the lattice planes parallel to (0Â 0Â 1) of anatase TiO2. Less grain boundaries and direct electrical pathway for electron transferring were crucial for the superior photoelectrochemical properties of the single anatase TiO2 nano-pillar arrays. This approach provides a facile in situ method to synthesize TiO2 nano-pillar arrays with a special morphology on titanium substrate.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Xiang Dong, Jie Tao, Yingying Li, Hong Zhu,