Bavykin, Dimitry V., Gordeev, Sergey N., Moskalenko, Andriy V., Lapkin, Alexei A. and Walsh, Frank C.
Apparent two-dimensional behavior of TiO2 nanotubes revealed by light absorption and luminescence
Journal of Physical Chemistry B, 109, (18), . (doi:10.1021/jp050762m).
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Optical absorption and photoluminescence (PL) properties of colloidal TiO2 nanotubes, produced by the alkali hydrothermal method, were studied at room temperature in the range 300-700 nm. Nanotubes having an internal diameter in the range 2.5-5 nm have very similar optical properties, in contrast to the expected behavior for quasi-1-D systems. This is explained by the complete thermal smearing of all 1-D effects, due to the large effective mass of charge carriers in TiO2, resulting in an apparent 2-D behavior of TiO2 nanotubes.
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