《235_ftp》.pdf

FULL PAPER Nanostructuring Titania: Control over Nanocrystal Structure, Size, Shape, and Organization Abdelkrim Chemseddine*[a] and Thomas Moritz[b] Dedicated to Professor J. Rouxel in recognition of his important contributions to the chemistry of solids Keywords: TiO2 / Growth / Self-organisation / Polytitanate / Nanocrystals / Nanostructure / Superlattice / Films Control over crystal structure, size, shape, and organization titania films. Furthermore, larger anatase TiO2 nanocrystals of TiO2 nanocrystals has been achieved by means of wet of different sizes and shapes have been obtained by chemistry. Hydrolysis and polycondensation of titanium adjusting the relative concentrations of titanium alkoxide alkoxide [Ti(OR) ] has been performed in the presence of and Me NOH, the reaction temperature, and the pressure. 4 4 tetramethylammonium hydroxide (Me4NOH). This base both HRTEM, XRD, and EXAFS have been used to characterize catalyzes the reaction and provides an organic cation that the various samples and to elucidate the growth of titania stabilizes the anatase polyanionic cores formed in this anatase. Our observations are in accordance with medium. These anatase clusters are organized so as to favour theoretically predicted condensation and growth pathways. self-assembly into intermediate nanocrystals, which, in turn, The formation of mesoscopic structures through a self- self-assemble into superlattices. This self-assembling process assemb