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A surfactant-assisted nonaqueous strategy, relying on high-temperature aminolysis of titanium carboxylate complexes, has been developed to access anisotropically shaped TiO2 nanocrystals selectively trapped in the metastable brookite phase. Judicious temporal manipulation of precursor supply to the reaction mixture enables systematic tuning of the nanostructure geometric features over an exceptionally wide dimensional range (30−200 nm). Such degree of control is rationalized within the frame of a self-regulated phase-changing seed-catalyzed mechanism, in which homogeneous nucleation, on one side, and heterogeneous nucleation/growth processes, on the other side, are properly balanced while switching from the anatase to the brookite structures, respectively, in a continuous unidirectional crystal development regime. The time variation of the chemical potential for the monomer species in the solution …
American Chemical Society
Publication date: 
20 Aug 2008

Raffaella Buonsanti, Vincenzo Grillo, Elvio Carlino, Cinzia Giannini, Tobias Kipp, Roberto Cingolani, Pantaleo Davide Cozzoli

Biblio References: 
Volume: 130 Issue: 33 Pages: 11223-11233
Journal of the American Chemical Society