Abstract
In this study TiO 2 nanotube arrays were fabricated by potentiostatic anodization of titanium sheet. The X-ray diffraction (XRD) pattern and field emission scanning electron microscopy (FE-SEM) image indicated the TiO 2 nanotube arrays were of pure anatase form and highly ordered. The properties of the photo-generated charges in the nanotube arrays were investigated by transient photovoltage (TPV) technique and surface photovoltage (SPV) technique based on lock-in amplifier with dc bias, in comparison with the commercial powder derived film. The separation processes of the photo-induced charges in the system of TiO 2 nanotubes on Ti have been demonstrated to be correlated with the incident light intensity, surface trapping states, and the interfacial electric field between Ti and TiO 2 . The results also show that the highly ordered nanotube film could generate much stronger SPV responses under external electric field than the commercial powder derived film.
| Original language | English |
|---|---|
| Pages (from-to) | 7217-7221 |
| Number of pages | 5 |
| Journal | Applied Surface Science |
| Volume | 256 |
| Issue number | 23 |
| DOIs | |
| State | Published - 15 Sep 2010 |
| Externally published | Yes |
Keywords
- Photo-generated charge
- Surface photovoltage
- Titania nanotube array
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