Synthesis of functional nanocomposites based on aluminum oxides

Abstract

A universal method has been developed for producing nanomaterials based on the use of solid-phase matrices with ordered porosity, these are called solid-phase nanoreactors, in this case porous aluminum oxide. It allows you to create nanomaterials with a unique complex of functional properties that are characteristic only for highly organized arrays of ordered nanoparticles with a pore size narrow distribution. Perspective matrices for the synthesis of the nano-composites are films of porous anodic aluminum oxide, having an ordered structure. They are thermally stable and chemically inert with respect to most materials. The purpose of this work was to study the features of preparing nano-structured anodic aluminum oxide as a matrix to create a composite Al2O3–WO3 system with specified functional properties. Influence of the nature of sulfuric acid (H2SO4) and oxalic acid (C2H2O4) electrolytes and their concentration on the porosity of anodic aluminum oxide was established. The synthesis parameters for obtaining oxide films on aluminum substrate with a given pore geometry and nanostructures in the bulk of the aluminum oxide (Al2O3) matrix were determined. A method for immobilizing by introduction WO3 in a film of porous aluminium oxide is proposed which makes it possible to obtain an electrode suitable for use in gas semiconductor sensors for detecting nitric oxides NOx.