TiO_2 Un-Doped and Pd-Doped Films Obtained from Sol-Gel Nanopowders

摘要

The present work has studied some un-doped and Pddoped sol-gel TiO_2 nanopowders, obtained by simultaneous gelation of both precursors Ti(OEt)_4 and Pd(acac)_2, presenting various surface morphologies and structures. The obtained materials have been embedded in vitreous TiO_2 matrices and un-doped and Pd-doped TiO_2 coatings have been prepared by dipping procedure using glass substrates. Their structural evolution and crystallization behavior with thermal treatment were followed by: thermal analysis, XRD, IR, FT-IR, UV-VIS and TEM techniques. The influence of Pd on TiO_2 crystallization both for supported and un-supported materials was studied (lattice parameters, crystallite sizes, internal strains). The hydrophilic properties of the films were also connected with their structure, composition and surface morphology.