Preparation of 3D Composite Nanomaterials Based on Opal Matrices by Reduction of Palladium and Platinum Compounds

We have prepared composite nanomaterials based on opal matrices with silica particles with a diameter of 300 nm and compounds of metals of group 10 of the periodic table (Pt and Pd). The first time dichlorodiamminepalladium and its water-ammonia solutions as a source of palladium for filling opal matrices are used. In addition, experiments were carried out on the introduction of platinum and palladium into a silica matrix with nano-sized pores using amino groups. Conditions have been found for obtaining materials with various forms of metal incorporation, both in the form of isolated particles in the voids of the opal matrix, and in the form of a continuous coating of the surface of a silica particle. A study of the electromagnetic properties of these samples showed a significant change in impedance and dielectric constant compared to the original opal matrix. The resulting composite nanomaterials, such as metal-filled inverse opal, can find wide application in various fields of optics, electronics, and catalysis.