Journal
SCIENCE CHINA-CHEMISTRY
Volume 55, Issue 2, Pages 229-234Publisher
SCIENCE PRESS
DOI: 10.1007/s11426-011-4335-6
Keywords
surface photovoltage; phase spectra; TiO2 nanotube arrays; surface state; charge carrier property
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Funding
- National Basic Research Program of China (973 Program) [2007CB613303]
- National Natural Science Foundation of China [20873053]
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By using the surface photovoltage (SPV) technique based on a lock-in amplifier, surface states located 3.1 eV below the conduction band of TiO2 have been detected in TiO2 nanotube arrays prepared by anodization of titanium foil in fluoride-based ethylene glycol solution. The photo-induced charge transportation behavior of TiO2 nanotube arrays was also studied by qualitatively analyzing their SPV phase spectra measured under different external bias. When a negative bias was applied, carriers excited from surface states have the same transportation properties as those excited from the valence band; in contrast, when a positive bias was applied, these two kinds of photo-excited carriers exhibit different transportation behavior.
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