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We demonstrate the light-induced, reversible wettability of homogeneous nanocrystal-based, thin-film coatings composed of closely packed arrays of surfactant-capped anatase TiO2 nanorods laterally oriented on various substrates. Under selective pulsed UV laser excitation, the oxide films exhibit a surface transition from a highly hydrophobic and superoleophilic state (water and oil contact angles of ∼110° and less than ∼8°, respectively) to a highly amphiphilic condition (water and oil contact angles of ∼20° and ∼3°, respectively). A mechanism is identified according to which the UV-induced hydrophilicity correlates with a progressive increase in the degree of surface hydroxylation of TiO2. The observed wettability changes are not accompanied by any noticeable photocatalytic degradation of the surfactants on the nanorods, which has been explained by the combined effects of the intense and pulsed …
American Chemical Society
Publication date: 
24 Jan 2008

Gianvito Caputo, Concetta Nobile, Tobias Kipp, Laura Blasi, Vincenzo Grillo, Elvio Carlino, Liberato Manna, Roberto Cingolani, Pantaleo Davide Cozzoli, Athanassia Athanassiou

Biblio References: 
Volume: 112 Issue: 3 Pages: 701-714
The Journal of Physical Chemistry C