Synthesis of meso/macroporous multilayered thin ceramic films

M. CECILIA FUERTES; PAULA C. ANGELOMÉ; GALO J. A. A. SOLER-ILLIA

Buenos Aires

Otro; 7th J. J. Giambiagi Winter School; 2005

In the last decade, a large amount of synthesis protocols for materials with tailored porosity has been developed. Integrative synthesis methods should allow to combine nanoscopic matter in composites where spatial separation of regions with different chemical properties is possible, leading to advances in integrated chemical sensors, preconcentrators and bionanomaterials. The design and construction of meso/macroporous multilayered structures is a fundamental step in order to create multifunctional devices that include the advantages of both systems, such as a very high specific surface, tailored pore size and controlled surface characteristics, and an open macroporosity, which permits matter transport and interaction with species such as biomolecules, membranes, cells. The conjunction of meso and macroporous films synthesis strategies makes possible the production of multilayered structures, alternating porous films with different pore size and physicochemical properties. In this work, we present the synthesis by dip coating of meso- and macroporous thin ceramic films, obtained by the combination of the sol-gel technique with supramolecular templating and controlled phase separation methods. Moreover, successive dip-coating/stabilization/template extraction cycles permit to create multilayered thin films presenting tailored porosity in the z axis. Tridimentional architectures with porosity at different scales can be achieved by selectively etching a determined layer. The obtained materials were characterized by SEM, TEM, XRD, EDS and FTIR.