Abstract
The electronic structure of the TiO 2 surface in contact with an electrolytic solution is studied by means of the conductance and capacitance-relaxation methods. The deposition of Fe atoms on the TiO 2 surface results in the formation of surface states. The surface-state density is located at about 0.6 eV below the bottom of the conduction band of TiO 2. The estimated total density of the surface states ranges from 1.9 × 10 13 to 2.8 × 10 13 cm −2. The origin of the surface states is tentatively assigned to the chemisorption bonds between the surface O (or Ti) atoms and the adsorption Fe atoms which may be coordinated with some oxygen atoms.
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