Nanostructured TiO2 Films with 2 eV Optical Gap


  • The authors gratefully acknowledge Prof. L. Kavan for useful discussions. This work was supported by Provincia Autonoma di Trento under project RASO and by Fondazione Cariplo.


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Nanostructured TiO2 (ns-TiO2) films obtained by supersonic cluster beam deposition possess highly porous, defective structures, and allow efficient incorporation of carbon- containing molecules during thermal treatment. Carbothermal reduction modifies the electronic structure of the ns-TiO2, narrowing the optical gap to 2 eV. This is within the range of visible solar radiation (see Figure), allowing more efficient photoconversion.